Environmental Analysis - Science topic

Generally speaking, I was checking if the presence of animal carcasses could be determined based on the chemical composition of the soil. I know that in the context of ecological modeling and environmental data analysis, the moderate predictive power of models, as suggested by the R² values presented in my analysis (around 38%), is often considered acceptable. I used GLM. I am having trouble finding scientific articles to support this... I am only finding articles from the "social sciences". Can you help?

In recent years, more and more different political options during election campaigns before parliamentary and other political elections have added to their election slogans the issues of sustainable economic development, green transformation of the economy, increasing pro-climate and pro-environmental policy measures, including a significant increase in the development of renewable energy sources, decarbonization of industry, development of sustainable organic agriculture, sustainable energy-efficient construction, electromobility, recycling, development of sustainable tourism, development of urban agglomerations in accordance with the concept of green smart city, significant increase in the scale of reclamation of natural environments in areas degraded by industrial development, increase in the scale of protection of biodiverse natural ecosystems, natural forest ecosystems, increase in the scale of reforestation and other aspects of a sustainable green circular economy, and after winning the elections, they only slightly implement their election promises to citizens, or do not implement these promises at all. Since the scale of this phenomenon is growing so the importance of the discussions held in the issues of not fulfilling election promises on the issues of sustainable economic development, green transformation of the economy, increasing pro-climate and pro-environmental policy measures by the political options winning the elections is also increasing. When this kind of situation is repeated repeatedly in a certain country then citizens begin to consider the possibility of recognizing this kind of unreliable political activity as antisocial and perhaps also not in accordance with basic human rights and the Constitution.

I am conducting research on this issue. I have included the conclusions of my research in the following article:

I invite you to discuss this important topic for the future of the planet's biosphere and climate.

In view of the above, I address the following question to the esteemed community of scientists and researchers:

What do you think about this topic?

What is your opinion on this issue?

Please answer,

I invite everyone to join the discussion,

Thank you very much,

Best regards,

Dariusz Prokopowicz

Based on my research, I conclude that the green business transformation of business entities, including companies, enterprises, financial and public institutions, should be a key component of corporate social responsibility, namely environmental social responsibility and climate social responsibility. Accordingly, environmental social responsibility and climate social responsibility should be recognized as key factors in corporate reputation and non-financial ESG reporting. An important factor for effectively carrying out the pro-environmental and pro-climate transformation of the classic growth brown linear economy of excess to a sustainable green zero-carbon growth zero-carbon economy and a closed loop economy is to increase the pro-environmental and pro-climate awareness of citizens. Awareness of the urgent and effective implementation of the green transformation of the economy, including the implementation of the plan to reduce greenhouse gas emissions until the creation of a zero-carbon economy, to slow down the process of progressive global warming to save the climate, biosphere and biodiversity of the planet's natural ecosystems is a key determinant of ensuring the conditions of existence on the planet for future generations of people. Accordingly, the issue of pro-environmental and pro-climate awareness of citizens should be correlated with the environmental social responsibility and climate social responsibility of business, i.e. economic entities, including companies, enterprises, financial institutions and other organizations. Meanwhile, environmental social responsibility and climate social responsibility should be an important factor in the green reputation of companies, businesses, financial and public institutions, and also an important element of non-financial ESG reporting.

Key aspects of the implementation of the goals of sustainable development and the necessary acceleration of the processes of green transformation of the economy to decarbonize the economy, slow down the process of global warming, protect the climate, biosphere and biodiversity of the planet's natural ecosystems I described in the article:

In view of the above, I address the following question to the esteemed community of scientists and researchers:

What do you think about this topic?

What is your opinion on this issue?

Please answer,

I invite everyone to join the discussion,

Thank you very much,

Best wishes,

Dariusz Prokopowicz

Which option is most suitable when considering factors such as gas emissions, environmental consequences, and economic implications?

Hello,

I'm interested in exploring life cycle analysis for composting toilet, specifically focusing on various scenarios related to nutrient removal. Can you recommend any articles or provide suggestions that could assist me in my research?

Thank you very much

The 28th UN Climate Conference (COP 28) will be held in Dubai, United Arab Emirates, from November 30 to December 12, 2023. In view of the fact that 2023 was the warmest year in 125,000 years, so the question is increasingly topical: Why are the pledges made by governments and corporations at the UN COP Climate Summits to accelerate the processes of green transformation of the economy not being implemented or only marginally implemented? The COP28 Climate Summit once again points to the need to raise funds to help economically underdeveloped countries and those particularly burdened by the negative effects of the accelerating process of global warming to finance pro-environmental and pro-climate economic ventures, create solutions to reduce the aforementioned negative effects of climate change, and prevent the development of these negative effects, including but not limited to building power plants based on renewable and zero-emission energy sources, building additional irrigation systems, desalinating seawater, developing climate-resilient construction, developing sustainable agriculture adequately protected against increasingly frequent and severe periods of drought, counteracting the progressive process of soil aridity, stopping the progressive process of deforestation of tropical rainforests, and so on. In addition, once again, as at previous UN COP climate conferences, the same demands were made, including, among others, that there should be no more support for fossil fuels, as unfortunately these subsidies are still in place. In addition, that the continuing processes of forest deforestation should be replaced with aforestation, among other things, in industrially degraded areas, that the rapid decline in the biodiversity of the planet's natural ecosystems should be halted, that expansive industrial agriculture should be replaced with sustainable organic farming, that waste generation should be reduced and closed-loop economics should be developed, and so on. However, at the current UN Climate Conference COP28, strongly controversial issues have emerged, which may suggest that the issue of urgently accelerating the green transformation of the economy is still not taken seriously by some countries. Well, the UN Climate Conference COP28 will be chaired by a board member of one of the world's largest oil companies. The hosts of this year's COP28 Climate Conference, the Saudis want to promote technologies to capture CO2 from the atmosphere and do not want to reduce oil production. Unfortunately, this way the climate crisis will not be solved. This issue evidently confirms the thesis that countries that have developed large-scale fossil fuel extraction and/or processing industries are not interested in seriously, efficiently and quickly implementing the green transformation of the economy.

In view of the above, I address the following question to the esteemed community of scientists and researchers:

And what is your opinion on this topic?

What is your opinion on this issue?

Please answer,

I invite everyone to join the discussion,

Thank you very much,

Best wishes,

Dariusz Prokopowicz

What is the difference between the percentage of nutrient recovery and nutrient removal achieved by the struvite precipitation technology?

According to the following points, describe your opinion:

August 28th, 2023.

The institutional control and governance concerning the human-boosted pressure on the outer space environment is deteriorating very fast. Amid a speeding-up and overlapping climate and Earth's ecology breakdowns it is being hard to understand and to find a rational explanation to the deployment of the 'New Space Economy' while humans are discarding any collective effort in focusing all the space-related agencies and capabilities to give priority to Earth observation and damage control (as much as possible) on the Earth's Life Support Systems (ELSSs).

The attached letter is a public position paper that was sent to the acting Head of UNOOSA (United Nations Office for Outer Space Affairs) last year.

As the entire world adopted the 'weak' definition of Sustainable Development (SD) humans can not get surprised to realize the entire 2030 Sustainable Development Goals (SDGs) agenda is being compromised.

The huge lack of rationality in the outer space domain is a signal that tells us the same situation is taking place in all of the remaining 'global commons' and the associated institutional architecture (treaties).

Could the space affairs researchers here in ResearchGate provide me with your inputs and papers that logically and analytically challenge that risky trend in the space domain...?

Hernan L. Villagran

This discussion aims to explore the environmental impacts associated with large dam construction and operation. Large dams have been built worldwide to meet various societal needs, such as hydroelectric power generation, water supply, irrigation, and flood control. However, the ecological consequences of these projects have raised concerns among environmentalists, researchers, and policymakers.

I am interested in gathering thoughts and insights from experts on Researchgate regarding this topic. Specifically, I would like to hear about other aspects related to the environmental impacts of large dams, such as:

Additionally, I would greatly appreciate advice on how to structure and present a comprehensive presentation on this topic. What key points, data, and visuals should be included to effectively communicate the complex interplay between large dams and the environment? Any recommendations or suggestions from fellow experts would be invaluable.

Thank you in advance for your contributions, insights, and guidance on this important topic.

Published in March 2023, the new report of the Intergovernmental Panel on Climate Change (IPCC) of UN scientists summarises the previous 6 IPCC reports produced and published between 2018 and 2022. These reports have involved a huge amount of scientific work, many thousands of scientific papers have been examined. Thousands of scientific reviews were produced, in which around 100,000 different aspects, comments etc. were included and reviewed. The analysis shows, among other things, that more than 99 per cent of the scientific papers support the thesis that human civilisation has led to a significant and accelerating increase in greenhouse gas emissions since the beginning of the first industrial revolution, which has become a key factor in the increasingly rapid process of global warming. Studies and estimates show that 2.5 trillion tonnes of CO2 have been released into the atmosphere since the mid-19th century, with half of this amount entering the atmosphere in the last three decades. It has been estimated that 3.5 billion people are at risk of serious negative impacts from the ongoing global warming process. According to the results of the study, the processes of green transformation of the economy should be significantly accelerated, including the rate of decarbonisation of economic processes. without this acceleration, the strategic goal of global climate policy established during the Paris Agreement in 2015, which is to limit the scale of the increase in the temperature of the planet's atmosphere to max. 1.5 degrees C since the beginning of the first industrial revolution, i.e. since the 17th century. In order for this goal to be realistically achievable, it is necessary to significantly accelerate the implementation of the green transformation of the economy, so as to halve CO2 emissions by 2030 at the latest and achieve total zero-emission of the economy by 2050. Unfortunately, the populist, opportunistic economic policies supported by the dirty combustion energy sector, including pseudo-climatic policies, continue to ignore the results of scientific research, including the UN IPCC reports on the role of man as regards the sources of the increasingly rapid process of global warming.

In view of the above, I address the following question to the esteemed community of scientists and researchers:

What do you think about this topic?

What is your opinion on this subject?

Please respond,

I invite you all to discuss,

Thank you very much,

Best wishes,

Dariusz Prokopowicz

I am estimating the mass balance for the organic waste of different feedstocks using the anaerobic digester and the struvite precipitation reactor. How can I use the math algorithms to estimate the flow of the influent and effluent of the organic waste?

Hi

can anybody please tell me what is  the value (-0.157) next titanium concentration in my soil sample means?

I am simulating a chemical process using Aspen HYSYS and I need to calculate the greenhouse gases emissions (CO2, NOx, SOx). How this can be done using the software directly?

Special emphasis on PMF model.

EIA was introduced in early 1960s with the aim to analyze a proposed developmental project for its negative impacts on environment and identify suitable mitigation measures. Initially EIA was limited to developed countries. In 1970s the impact analysis concept was transferred to developed countries. Initially it was practiced in an informal manner. But later on it became a mandatory activities accross the globe through proper legislation. Initially national environmental quality standards were introduced. In this way all methods developed for impact evaluation were kept aside and NEQS were used for comparison.

In the second step Initial environmental impact analysis was introduced for small scale projects and screening exercise was removed. In the 3rd step some treatments were made mandatory for some projects and monitoring and evaluation was removed. In this manner EIA was started as one formal step at the start of a project. Now EIA is not a continues activity. It is used to get No Objection Certificate (NOC) from environmental protection department.

Seawater as my sample to analyse the content of heavy metals by ICPMS.

Dear to whom it may concern,

I have been developing a solid phase extraction-based sample preparation method for environmental samples.

I would sincerely like to ask you about the SPE process namely that after loading the samples onto SPE cartridges, I am wondering which next steps will be carried out:

1. Rinse these cartridges with the weakest elution strength solvent (for example, water or water with 5% MeOH for C-18 SPE adsorbent), Or

2. Dry these cartridges under nitrogen stream for 15 or 30 mins, Or

3. Do both of the steps in order: rinse these cartridges and then, dry them.

In case of drying these cartridges, how long should the step be carried out? As far as I know, some compounds can be more strongly trapped onto these cartridges, leading to their low recovery if the step last for a longer time.

I hope that you may spend a little time helping me clear the inquiry.

Thank you so much.

Autodesk has discontinued development of the Ecotect software (for environmental analysis) since 2016. What are the best alternatives currently available in your opinion? Especially in the area of insolation and daylighting?

In microwave radiometry of soil moisture, what is the typical magnitude or range of errors introduced by variations in soil roughness and vegetation cover? Soil texture can also affect accuracy, but soil roughness and vegetation cover seem to be most important.

What is the exact method for determining the detection limit of an element in a given matrix (mg kg-1 or mg cm-2) using WD/ED-XRF?

If you would like to ask someone about coronavirus and What is the role that they can take to combat the spread of coronavirus

What are the questions you may ask?

And if someone asks you the same question, what will be your answer?

For example, If the candidate is an environmental engineer, we may ask what is the role of an environmental engineer in combating the spread of coronavirus?

I will be happy if we can share our experience and combine them together from all over the world. Sharing our experience will be very helpful to put a strategy that we can use it in the future.

Best wishes,

Dr. Zainab

In the field of environmental modelling, who is the end user of a model? The person/group who made it or others?

Which specific environmental problems can be accessed or solved by environmental modeling?

Dear to whom it may concern,

Based on ChemAxon, I calculated pKa values of Acesulfame as follows:

Because I would like to convert Acesulfame Potassium into Acesulfame, I intend to use a stronger acid such as HCOOH or HCl than Acesulfame to do this conversion.

I am wondering whether this approach will really work or not.

May you please share your opinion with me?

Thanks in advance,

Quynh Khoa Pham.

Dear Colleagues,

A call for papers in an interesting special issue in Sustainability, "Environmental Sustainability Assessment of Crop-Livestock Production System"

This Special Issue welcomes papers covering the research associated with assessing and improving the environmental sustainability of crop-livestock production systems. The editor encourages the submission of original research and review papers that address the issues raised above. Please check the link for more details.

Dr. Davoud Heidari Guest Editor

#Sustainability #Environment #Life_cycle_assessment #Climate_change #Carbon_sequestration #Land_use #Foodsystems #Livestock #Agriculture #Mitigation_strategies #Special_Issue

see above

Dear to whom it may concern,

May I ask you about the difference between porous graphitic carbon (PGC) and graphitized carbon black (GCB) in terms of surface properties, retention mechanisms, and redox potentials?

Thank you so much,

Quynh Khoa Pham.

Dear to whom it may concern,

I am investigating carbonaceous materials to treat aqueous samples but I have no knowledge of these materials.

May I ask you some questions as follows?

1. Whether these materials possess both polar and non-polar interactions

2. May you please show me mechanisms by which we can explain why these materials have the above properties?

Thank you so much.

There are reports and complain on the non implementation of rulings of the courts and other dispute settlement bodies which are in favor of the local communities affected by these environmental pollution in the Niger Delta Nigeria. Does any one has any information on the above assertion. Whether in the form of book or Article, journal or caselaws.

I need some climate variables (due to climate change) to estimate climate change impacts in agriculture (rice) yield.

An acid digestion technique with minimum steps is preferable. The target analyte is metal, and ICP-OES is the analytical tool.

Please also share the knowledge about the long-term preservation of the samples of vegetable, fruit, pulses and cereals before digestion.

6th Vienna young Scientists Symposium, TU Wien (Vienna University of Technology), Austria

June 25-26, 2020

Consisting of four mini-symposia, the symposium has an overall theme of "Technology, Science, and Design for a Sustainable World". The themes of the mini-symposia are:

• Innovative Materials and Green Chemistry

• Energy and Resource Engineering

• Sustainable Buildings, Cities and Infrastructures

• Environmental Analysis and Modeling

Abstract submission deadline: March 15, 2020

"The purpose of the innovative platform Vienna young Scientists Symposium (VSS) is to enhance the interdisciplinary professional exchange between members of the TU Wien." "All scientific staff and students of TU Vienna are cordially invited to participate in this event as speakers."

More information at: https://vss.tuwien.ac.at/home/EN/

#VSS2020 #TUWien #scientists #symposium #technology #science #design #sustainableworld #sustainability #innovation #materialsscience #greenchemistry #energy #resourceefficiency #sustainablearchitecture #sustainablebuilding #sustainablecities #sustainableinfrastructure #architecture #urbanplanning #urbandesign #civilengineering #climatechange #research #environmentalanalysis #environmentalmodeling

This is the third call for applications for Short Term Scientific Missions (STSMs) for grant period 2 of the COST Action CA17136 - INDAIRPOLLNET (https://indairpollnet.eu/). STSMs are institutional visits aimed at supporting individual mobility, fostering collaboration between individuals. These missions contribute to the scientific objectives of COST Action CA17136 - INDAIRPOLLNET. They are particularly intended for young scientists. The selection of applicants is based on the scientific scope of the STSM application which must clearly contribute to the overall objectives of the Action CA17136 and be related to a specific Working Group. Interested researchers can apply by following the instructions provided in the attached document and submitting their application and supporting documents until 31 January 2020.

Especially in metropolitan areas.

Which one has the highest impacting today?

Which heavy metal have the highest pollution rate in urban soils todays?

Soil is an important source for heavy metals in crops and vegetables since the plants’ roots can absorb these pollutants from soil, and transfer them to seeds which through this can effect on humans, but what about soils in urban areas?

The physical and chemical properties,

Toxicity,

Impacts on human, animals, plants, soils, waters, ...

I'm looking for studies on environmental analysis carried out by geostatistics

This project is looking for soil organic carbon data and changes in China.

We are seeking your support in collecting SOC data to predict and map SOC. What we would need are the SOC, bulk density, and soil texture contents for entire China or any provinces or any district in China.

Any metadata in more detail are welcomed.

Thanks in advance.

#

Which technique is most suitable for elemental analysis in the environmental analysis?

Instrumental neutron activation analysis INAA

Inductively coupled plasma mass spectrometer ICP-MS

X-ray fluorescence XPR

In the United States, along roadsides and on Federal lands since the coming of the European peoples with their European exotic seeds, those exotic and invasive seeds have been sown in America's wild lands and along the roadsides, causing permanent "Spatial Extinction" of the local native plant populations across hundreds of millions of hectares.

For example in the USA, our Bureau of Land Management has annually sown an average of one million pounds (about 1/2 million kilos) of exotic seeds onto Western wild lands between 2000-2015, without ever doing an environmental analysis under our environmental laws (NEPA), to consider the permanent environmental damages being done to the native plant ecosystems, when BLM already has the least environmentally damaging alternative available, of using local native seeds instead?

Our State highway departments sow so many exotics along roadsides, that my 1997 Megatransect across the West showed massive Spatial Extinction of the native ecosystems, and in many cases the intentionally-sown exotics covered 20-30X more area than the exotic weeds covered, at http://www.ecoseeds.com/megatransect.html as follows--State highways, percentage of roads with intentionally sown exotics--Colorado, Idaho and Nevada 10%, Idaho 21%, South Dakota 28%, and Wyoming 35%.

SO, THE QUESTION IS--Do the government agencies need to immediately stop the use of exotic seeds along roadsides and on wild lands, and that includes the use of "cultivars" of natives, when they are sown outside of their original ecotype zone areas?

What kind of method can be used to manage censored laboratory data (such as: water quality data like nitrate, phosphorus, silica, etc)? I mean sometimes we get data below the accuracy of the measurement (<0.001 or <0.01).

doing project on remediation of contaminated soil with recovery of heavy metals.so planning to contaminate a sample artificially with heavy metals.

I'm going to analyze heavy metals content in soil samples (after digested with aqua regia). Is it possible to directly analyze the sample using FAAS? Is there any potential interference from the other anions that naturally associated with the heavy metals in the soil samples that later on will reduce the intensity of the excited metal ions detected by the instrumental detector?

This question is part of a questionnaire about LCI that intends to know the difficulties of the users of LCA in the elaboration and quantification of LCI by means of their methods.

Participate in this research by accessing the link https://goo.gl/forms/cqU2yriEuzVxL8bz2

Thank you for your interest and participation in this research.

PFCs standard for environmental analysis.

Hi everyone

I have an article that will be published soon. In this paper, precipitation is predicted by MPI-ESM-MR model in Tabriz (The largest city in northwestern Iran). The results showed that, according to the both RCP4.5 and RCP8.5 scenarios, the winter precipitation will be increase over the three future periods (2021-2040, 2041-2060 and 2061-2080). Even in the RCP4.5 scenario, the trend will be ascending. While Tabriz's winter precipitation trend is descending in the base period until 2015! It seems to be a contradiction. This means that over the next three years, the winter precipitation will suddenly rise! Is this possible?? What's your opinion?

Hi, for my thesis research, I am looking for a simple and accurate tool to measure habitat fragmentation caused by transit infrastructure.

Thanks

I am working on a Biochar for Dry land agriculture and Agro forestry development which requires carbon stock analysis in below and above ground biomass.

Any type of energy

Hi to all. Do you have any suggestion of business case studies inherent to the circular economy, with good data available to perform an economic and an environmental analysis about the benefit since the implementation of the circular economy strategy?

I'm looking for a relatively simple analytical method (colorimetric analysis etc.) for measuring methanol in aqueous solutions in the concentration of about 100 µM ?

What are the scope of quality research for an Electrical Engineering background scholar?

Can you let me know some potential area of the research?

Is there any sound Mathematical modelling for Water-Energy-Food nexus?

I am looking for answer from Expertise only.

Thanks for your attention.

I want to seek the opinions of experts in the field of environmental science. I intend to determine elemental contents of some freeze dried plant samples collected after an experiment. Since I want a non destructive method of determination of these elements, mostly transition elements. I am being sceptical about the use of XRF because I have been used to the use of conventional method of total digestion and analysis by either A AS or ICP MS. So, I want to hear opinion of people that have used XRF concerning the reliability and reproducibility of results. Is it better than normal conventional element analysis and how reliable are the results from XRF? Thank you all

I'm looking for an approach to automatically define the bankfull limits of a river channel  having an High resolution DEM.

I used the approach proposed by: Williams, Garnett P. "Bank‐full discharge of rivers." Water resources research 14.6 (1978): 1141-1154. as could be found in my paper but I'm looking for other approach coupling also other type of data or approach.

Thanks.

In the search for methods of calculation of inventory, we find the so-called hybrid ACVs. Three of them are highlighted: Tiered hybrid approach, IO based approach and Integradted hybrid analysis. Are there other LCI hybrids?

Is it just me that I can't easily find case studies focused on environmental flow assessments based on hydrodynamic habitat modelling? I mean, in Europe I can barely see 10 or 15 such actual implementations. Neglecting that they are focused on fish, this number seems disproportionately low compared to the long-term research on the capability of hydrodynamic habitat models to develop defensible environmental flow recommendations... why do you think there is such a gap between research and practice on this field? Or isn't there? Is anyone aware of any article acknowledging this gap and commenting on it?

Air temperature from LST (day and night).

NN

I ran a column experiment with a tritium tracer and am trying to find out the porosity of the soil. Unfortunately, I discarded the soil inside the column already without measuring the mass used. The tritium arrived at 50% of injection concentration after 98 hours while the flow rate was 5 ml/h with a total column volume of  294 mL. The breakthrough curve itself was very sharp so there was little diffusion or dispersion.

Is it possible to number this ? is it by regarding policies (like Décret Sol in Wallonia) or the tolerance of plant species ? Tks ! Aricia

Iron 2000mg/l, 20mg/l and 8mg/l , chromium 2mg/l

I am curious to know if there is any system to classify health-care facilities (HCFs) and countries according to their health-care waste management practices.

Af far as I know, only the rapid assessment tool (RAT) and the individualized RAT (I-RAT) could give a support, but I am not aware of any comprehensive list with the result of their application. Here the link to both the tools:

Do you know about other classification tools available, please?

I am doing a panel plot with grads using subplot.gs and getting the following error:

[subplot ERROR] # of varying dimensions must be 1 or 2. Current setting is

X is varying Lon = -24 to 21 X = 1 to 91

Y is varying Lat = -4.5 to 28 Y = 1 to 66

Z is fixed Lev = 0 Z = 1

T is fixed Time = 12Z01JAN1996 T = 1

E is fixed Ens = 1 E = 1

I need to plot 10 figures in 2 columns of 5 each.

The individual plots are created but not in panel.

Any hint to solve this welcome.

I call the subplot like this for the first plot:

'subplot 10 1 '

'*d tp'

In Delhi, quality of air went to alarmingly toxic after the functions of Deepavali (Divali) when crackers are used at most by the people. This created 'zero visibility' even in day up to several days.

People with affordable income started to use air purifiers. But what can those people do who are not financially able to afford that. Why such people should suffer.

Is it not better that people making pollution should pay?

Government can charge on the basis of exhausted gases, chemicals etc. in the environment after a certain level. The collections should be paid on the maintaining healthy environment.

How do you think on this issue?

The pH of pure water is 7 at 25 ^_oC. The pH of rain water is around 5.6. This is due to gaseous substances dissolved in water. As temperature increases the pH of water decreases. As temperature increases the dissolution of CO₂ in water decreases. Why does the pH decrease? What will happen to the pH of water if we remove all the gases and impurities from water?

I am looking for a certified reference material to use for ammonium concentration of glacial/river water samples. I have not found any CRMs in a river water matrix containing ammonium. Is anybody aware of any in existence?

Hi everyone

Most papers are focused to study the lead oral bioaccesibility in urban soils with the Unified Bioaccessibility Method (UBM) from the Bioaccessibility Research Group of Europe (BARGE) (https://www.bgs.ac.uk/barge/home.html).

See for example

Roussel, H., Waterlot, C., Pelfrêne, A. et al. Arch Environ Contam Toxicol (2010) 58: 945. doi:10.1007/s00244-009-9425-5 http://link.springer.com/article/10.1007%2Fs00244-009-9425-5

Pelfrêne, A., Waterlot, C., Mazzuca, M. et al. Environ Geochem Health (2011) 33: 477. http://link.springer.com/article/10.1007%2Fs10653-010-9365-z

This method apply different reagents to simulate different conditions of saliva, gastric juice and Gastro-intestinal extraction....(several pHs). To make these different extractants... this method uses different reagents as inorganic solution (e.g. NaCl, NaH2PO4, etc.) but also uses pepsin, mucin, uric acid, etc... as organic solution.

I've some questions:

1. To apply this methodology, it's possible to make the extractions without organic solution (pepsina, urea, uric acid, etc.) and only make it extraction with a simulation of pH?

2. Anyone know an alternative methodology to investigate the bioaccessibility of lead and other metals in urban soils http://link.springer.com/article/10.1007/s11368-015-1304-2? TCLP method?

Thank you

Based on a short review, I found SEM-EDX (particle-based) and ED-XRF, ICP-MS, ICP-OES, ICP-AES, AAS,... (bulk). What method should be preferred and why? Filter material consists of teflon-coated borosilicate filters and Nuclepore track-etched polycarbonate membranes (Whatman).

I'm interested in the following elements: Cu, Cr, V, Mn, Fe, Ni, Zn, Pb, Ca, Na, Mg, Al, As

I need to compute mixture fractions (NPV, GV, soil, shade), and to learn how to use the endmembers criteria. I´ve read several articles about this topics, However, I still don´t know how to implement these concepts in order to classiffy degraded forest by using Landsat 8 imagery. So, in this context what I am looking for is practical information to understand how to use this concept in a very detailed way.