Questions related to Leaching
Rock in chemical solution will appear chemical damage, this damage is a kind of water-rock interaction, so we can expect rock mechanical properties cracking, what else can we pay attention to?
we have an aerated heap with sensing temperature. Shockingly, the part with aeration pipes records very lower temperatures (21-34 C) in comparison with the parts with no aeration pipes (56 C).
What are the probable reasons from operational and scientific viewpoints?
I am currently working on the research topic, "Metals recovery from Jarosite and Jarofix". The study will entail performing experiments using the acid and water leaching approach for the recovery of metals. I intend to focus on just Zn and Cu. I have reviewed some literature however I have not found a clear algorithm for the process and necessary parameters like temperature etc to be used in the process. I would appreciate if anyone with insight on this could explain it to me or render any form of help.
knowing that the acid concentration and the temperature are optimal.
Increasing the reaction temperature from ambient to 80°C increased the leaching yield
After IMAC1, the protein in the elution has some Ni leached out from the Ni column. The elution fraction seem to be brown in colour.
I need to know the complete calculation how much mol percentage of palladium is left after recycling my catalyst do that I can understand how much metal has leached from the prepared catslyst
Jadeite itself is an anhydrous mineral. However, the secondary action it undergoes, the leaching of limonite will change the appearance of jadeite, can the infrared spectrum be used to indicate its water content? If so, which wavelength data can be used to characterize it?
Thanks for your answers
Gender representation in numerous school textbooks across diverse societies has been studied and discussed since the 1970s. A substantial number of these studies stated that gender bias in textbooks (GBIT) is quite stubborn and practically a barrier in the way of gender inequality (Ullah & Haque, 2016). In particular, in textbooks of Social Studies, the construction of gender is solely stereotypical (Jabeen, Choudry, Omar, 2014). Hameed (2012) in his study on gendered based English textbooks found that in shaping up ideas of the children and for encouraging optimist gender roles in children, textbooks play a decisive role and can be a valuable tool. Further, Jabeen and Illyas (2012) emphasize that characters in (learning resources (textbooks) play a significant part in children. Characters influence children's choices concerning to what type of being they want to become (Jabeen & Illyas, 2012).
Unterhalter and North (2010) therefore argue that to achieve gender equality through education, the concerns of men and women would be considered as integral parts monitoring, designing, evaluating policies programs in all social, political, and socio-economical domains to provide equal benefit for men and women and to not perpetuate inequality. Emphasizing on efficiency approach of Gender and Development (GAD), Cornwall (2000) also mentioned that men as oppressors and women as a victim of gender inequalities is a simplification of reality. So, there is a need to view gender, not as a unilateral issue of women but it should also be considered in terms of power relations and powerlessness where men and women may be dis-empowered and vulnerable (as cited in Gender analysis framework of Leach, 2003, pp.10-11).
I am having leaching experiment. I took 10g soil sample and put in 100ml diluted acid solution (0.5M).
After leaching i took 5ml sample and add 5ml d.i water to dilute the samples (10ml total) to know the concentration of leachate.
since the concentration was higher than instrument detection limit, i further dilute that 10ml sample into 10 times (got 1ml from that 10ml solution and add 9ml d.i water).
now already got the concentrations, which are 86mg/L
anyone can help me for this calculations.
Help would be much appreciated. Thank You.
A student is installing a field trial that we expect to largely impact soil moisture and temperature, and we simultaneously want to measure the secondary impacts on N-mineralization in the field. What are the best methods for doing this. I've seen methods of installing closed bags of soil, but that will only react to temperature, not the soil moisture. We could measure total and inorganic N at the start and after the experiment, but there could potentially be differences in leaching losses that are not accounted for. Suggestions would be most welcome!
Many research has been done on the use of Chitosan as an adsorbent material. When I was studying the material, I noticed that it was leaching organics when I did a leaching test. Are there any recommendations to prevent organic leaching from chitosan beads?
I am observing a high UV260 absorbance plateau during the cleaning in place of my HIC column using 1 M NaOH. This is giving me confounding results in regards to mass balance. The HIC column uses a butyl ligand. Could this suggest that the integrity of the ligand is poor or could it be leaching out because of the high concentration of NaOH? The UV260 peak appears with or without loading sample.
I run a model on an aquifer with 3 layers. the contaminant is leaching on the upper layer. At the point of entry, the contaminant concentration is constant at 0.1 mg/m³.
I am having a hard time selecting the appropriate option in Sink/Source Concentration under MT3DMS/SEAWAT model as the options available are Constant head cells, well, river, and time-variant specified concentration.
Also, no recharge is applied to this model.
In soils normally the erosion losses of soil phosphate -P are considerable and they are monitored.The leaching losses are presumed to be negligible. Under what soil crop conditions the leaching losses of phosphate are considerable and need monitoring?
I have done hot filtration test for the catalyst to show leaching and I found no reaction after filtration. So, is it still necessary to perform ICP analysis of the catalyst??
According to the available references, PbCO3 and PbO are easily soluble in HBF4 and it is sometimes mentioned that adding H2O2 will improve the efficiency of the leaching by preventing the production of PbO2.
In my experiments, a white substance forms as soon as PbO or PbCO3 is added to HBF4 and dissolution does not occur at all. I also have done some 24 hours tests and even the temperature raised to 80 ° C in these tests, but no progress is observed in the process of leaching of this materials.
It would be really appreciated if anyone can help me through this leaching process of PbO or PbCO3 in HBF4!
I have a question about the interaction of the glass surface (soda-lime glass) with moisture and white paper. I would like to find some sources of information (articles, publications, studies, etc.). I have not yet found anything specific in the available libraries.
I have found experimentally that when wrapping glass in white paper (to store it), there is a problem with leaching of ions from the glass. This changes the adhesion properties of the glass.
I know that white paper is not generally recommended for packing and storing glass. Bleached paper reacts with Na ions from the glass. The low concentration of sodium ions on the glass surface results in further leaching of ions from the glass to the surface. And also deacidified paper has a so-called alkaline reserve. Glass is less resistant to alkaline environments, especially in connection with humidity.
I would like to know more. Please do you have experience with this phenomenon? Alternatively, can you send me links to publications that deal with this?
Good day, dear colleagues!
One of the critical point in the glass industry is a glass surface leaching.
Many factors may lead to this problem. Some of them is critical visible on the surface even vefore heat treatment (bending, tempering etc).
But I wanna talk about nonvisible (via human eyes) leaching.
Can You advice any method without destroing glass for identeficate glass surface nonvisible leaching?
What are the most effective and sustainable measures to prevent leaching from glass (precursor)-based geopolymer? Please recommend your suggestions and publications. Thanks.
I am doing an experiment to leach polonium-210 from my plant samples. I am having trouble getting decent recoveries. I am not able to use any heating methods because of the volatility of polonium. Does anyone have any recommendations to improve my leaching procedures? currently I am soaking the grinded plant samples overnight in HCl in a shaker.
I'm working on a manganese processing project. Unfortunately, in the manganese ore high amounts of divalent iron are present and it remain in solution after acidic leaching and increasing pH to 5.
Chemicals added to swimming pools leach into the air above the surface of the water, with the result that regular lap swimmers must be inhaling them to a significantly greater degree than casual pool users. Have there been any studies on the long term health effects?
The EDS analysis reported the decreasing amount of Nickel on catalyst surface after hydrogenation reaction. I thought there is leaching of Nickel during reaction and easier than leaching copper. But why and what is the properties of Nickel that can explain this result, the leaching of Nickel on catalyst.
I am using a Ni, Co, Ru activated carbon catalyst (simple impregnation method) for hydrogenation. But I am facing the metal leaching problem during recyclability. Please suggest to me some synthesis modifications, which will be beneficial to stop metal leaching and will not affect catalyst activity.
I need to prepare yttrium nitrate by dissolving its oxide into 6M nitric acid.
I would like to know any experimental considerations in this process to get best results.
- I have a very complex XRD spectrum (fly ash leaching residue) and couldn't match all the peaks with JADE. Do you know any free or paid software which may has strong database and can do search and match of complexes? In JADE you have to guess which is inside your sample and then compare with your peaks but when you are not sure about the formed minerals, this method is not helpful. Thank you!
A daily leaching column Nitrogen was conducted to investigate the rate of soil leaching. Now I search for a simple model of equation to represent scientifically the results.
Leaching of heavy metal can be a concern as heavy metal contaminated sludge is introduced to the finished products. It should be confirmed that leaching of heavy metal from bricks does not exceed the maximum permissible limit even under extreme conditions. The leaching efficiency was defined as the ratios of concentration of the heavy metal in the original sample and leachate of the sample
I'm planning the calcium leaching experiment. Thereby, the cement paste specimens were immersed in the 6M ammonium nitrate(NH4NO3) solution. If the specimens were removed at a specific immersion age, what method should be used to maintain the condition at that time? (For example, can it be maintained when the specimens were immersed in acetone and then dried?)
Does the β-cyclodextrin leach out during the pollutant removal from wastewater using β-cyclodextrin based composite materials and how it affects the pollutant removal efficiency? Could anyone suggest a reference paper showing the leaching of β-cyclodextrin and its effects on the pollutant removal process?
Hello everyone, my research is about leaching of gold from end-of-life printed circuit board by using Fe2(SO4)3 solution and the leachability was approximately 30-40%. Hence, i have some questions to ask.
1. Could these reactions be spontaneous in my solution?
Au + Fe3+ --> Au+ + Fe2+
2Au + SO42- + 2Fe3+ --> Au2SO4 + 2Fe2+
2. If not, in your opinion, what reactions might occur in my solution for gold leaching?
Hello everyone. My research is about kaolin bioleaching which reduced Fe3+ to Fe2+. I am required to filter out leaching solutions so I can dry the kaolin to powder form for ICPOES analysis to detect Fe3+ ions.
Since the leaching solution contains glucose, bacteria cells and reduced Fe2+ ions, may I know is cellulose nitrate or cellulose acetate membrane can be used for this filtration?
I am doing some leaching experiments now on metal-bearing wastes using citric acid as lixiviant. The metals of interest are REE, Co, Mo and V. Is there any specific method for each of them to be precipitated from organic (citrate) PLS? Or are the standard methods (e.g. precipitation of V using ammonia solutions) suitable for organic PLS?
We are trying to add nanoparticle power waste material in sustainable concrete, so we want to see any leaching effect of this material. Need suggestions and discussion from experts.
The commercial graphite is purchased from the market. And the recycled graphite is simply and mechanically recycled from the copper foil of a spent lithium-ion battery. There is no leaching or any other purity removal process on it. Does anyone could help to analyze these two spectra?
We want to couple proteins to Fe3O4 particles via their primary amine or SH groups. We can generate large amounts of these particles. We are currently trying coupling via epoxide group in which particles have been coated with a silane compound but are not having much luck. The coupling needs to be covalent and resistant to pH 3-13 so that there is low leaching of proteins. Please let me know if you can provide this expertise.
I had prepared 50ml of 0.5M Sulphuric acid and to that I added 20ml of 0.5M sulphuric acid containing 9 drops of 2M sodium hydroxide. I then leached the mixture for 15 minutes using a magnetic stirrer. In the same standard procedure I continued to increase the pH by adding more drops of sodium hydroxide that is from 9 to 34 and 50 drops.
I need to know the particle size for the test, concentration of acid, amount of sample to be tested and the apparatus to be used as well as how to analyze the solution.
Examples of articles of trivial scientific values:
1. Meswak extract did not have much effect on female mouse fertility. Phytomedicine.
2. Leached components from dental composites and their effects on fertility of female mice. Eur J Oral Sci.
Increased costs as well as increased awareness of the impact of fertilizer leaching on the environment have increased interest in use of controlled release fertilizer to increase the nutrient uptake efficiency and reduced the nutrient leaching potential. The application cost of fertilizer also reduced considerably.
when we check the iron leaching of zinc ferrite NPs, what could possibly happen with zinc ions. Can we associate the Fe leaching with zinc leaching as both are supposed to be chemically bound.
Froth Flotation has truly changed the mining/mineral/ metal industry and is one of the most revolutionary surface chemical separation technique. Temperature effects strongly influence the flotation performance both physically and chemically. Flotation operations in cold climates are therefore objective of my research work. Any valuable feedbacks in term of reference material and/or suggestions are highly appreciated.
I am looking for a modelling software to simulate post-grazing nitrate or N leaching in dairy farming in New Zealand condition. The idea is to estimate the amount of N leaching from different crop types (main objective) with considering different management systems, N fertilizer levels, soil and environments in the model. I have seen Overseer and APSIM models in the literature. Which one would you recommend? Is there anything else, any suggestion please?
Thank you in advance!
I experimented with loading metallic nanoparticles onto a substrate (for example, resin beads) at different mass ratios of precursor to substrate. After which, I precipitated the metal nanoparticles in situ by immersing in a solution. The final materials were then tested for leaching in DI water.
I expect that higher mass ratios may lead to more leaching of metal nanoparticles due to the greater amount of nanoparticles present. However, I found that lower mass ratios, leaching was higher. I am not sure if there is a plausible explanation for this, for example, higher mass ratios form larger nanoparticles, which may be more stable.
Any help would be appreciated.
I am developing a soil column experiment to study pharmaceuticals transport and attenuation.I would like to know If is better to use a glass or a PVC column to perform this experiment and why
I would be very grateful for any help
I have performed adsorption of hydrophobic organochlorine on PVC sheet, to measure the adsorbs amount I was used methanol and n-hexane as a solvent but bis(2-ethylhexyl) phthalate plasiticizer leached out a lot. In chromatography this phthalate high abundance cause interference in the organochlorine analysis. Please kindly suggest how can I over this interference.
If I have 40 g of malachite ore to work with,will it be necessary/enough to do head sample test for copper grade in the ore.will it be necessary to do tritration test if am going to work with 3 different leaching reagent with the same feed rate? .how will I decide on the concentration of reagents to optain maximum recovery?
I was given a Project that is to write up a research proposal on the topic " Leachability of Gold Telluride minerals", and I need assistance in coming up with a perfect Problem Topic and how to go about in the write up.
I was wondering if anyone has any clue why the amount of calcium carbonate formed (i.e. carbon dioxide sequestered) from the reaction between calcium ions and atmospheric carbon dioxide is slightly less at a liquid-to-solid ratio range of 0.2 - 0.7 compared to it at 0.1 (The liquid is pure water and the solid is hydrated cement paste i.e. portlandite (Ca(OH)2) and C-S-H) As you can see from the image attached, there is a slight dip in the quantity of carbon dioxide sequestered between the liquid-to-solid ratios of 0.2 and 0.7 but then it linearly increases past 0.7 to reach an optimum at 8.
I want to know about the basic concept of leaching regarding Sludge sample.
Also, what is the impact of the surface area during the leaching process?
Which Cluster Head (CH) selection technique is better?
1. In the LEACH algorithm, CH selection based on the probability dependent threshold, which was random in nature.
2. In the Fuzzy C-Means, every CH selected from the cluster members using the fitness function.
Iron is 4th most abundant element of earth crust, and there are about 10-20% Fe or below iron minerals/rocks/sands/clays at huge quantity that cannot be leached by traditional means, like red clay soils, or magnetic fraction of sand. Is it possible to use existing/genetically engineered plants, fungi and microbes for iron leaching from these sources? (e.g. genetically modified bog iron making peat). Would that be sustainable, economical and environmentally benign at present or future?
We use the technology of water magnitazation to release inutrients from the soil and leaching salts from soil profile in salt effected soils.
Gypsum is preferred but any salt can do.
I need to study the effect of leaching out of salt on the shear strength parameters of a salty soil.
Triaxial tests would be better and if volume change is recorded it will be much better. Direct shear tests will do also.
Can herbicide dicamba accumulate within the sewer sludge and leach out to the wastewater during the warmer months of the year?
It would be greatly appreciated if any one could share a similar experience, or provide me with some information in this regard.
We all use the non-solvent additives to improve the structure and performance of the polymeric membranes. However, the non-solvent additives can be easily washed out quickly with the solvent during the formation of the membrane as well as the cleaning process.
How can we calculate the amount of residual non-solvent (pore-former) additives in the membrane using IR spectra analyses?
There is a reference in this matter but I cannot understand the method that they used.
The chemicals sequence are 1M Ammonium acetate => 1M Acid acetic => 1M Nitric acid => Burn in oven at 500 degree in 8 hours => Milli Q => Total digestion.
Samples are equilibrated for 24 hours. Supernatants are collected after centrifugation then the samples are washed with MQ to get rid of the chemicals. The wash solution are also collected after vortex and centrifugation. The samples are then resuspend in MQ and dry in oven overnight at 60 degree.
Nothing comes out in the first 3 steps. However, in the final Milli Q steps (after burning in oven at 500 degree), even after centrifugation, the supernatant is red and turbid. I let it sit for a few days but it didn't change. When I added concentrated Nitric acid (15M) to reach 1% concentration, the supernatants quickly flocculated and settled down as pic attached.
I tried adding 2mL HCl 32% into 0.5mL sludge then vortex but it doesn't dissolve at all. So what happens here?
I will try to test the sludge on XRF or SEM to know the composition of the sludge but I am interested in knowing what is the mechanism after this phenomenon. If there's any info I can provide/clarify please ask.
Rice husk ash is increasingly being used in silicon production for electronics, which is required to be cleaned off water soluble alkali (and alkaline earth, to some extent) oxides. In Agriculture dominant area, rice husk ash is simply dumped outdoor as landfills by Rice mills. would it be better to use the dumped ashes for further purification to electronics, especially if not spoiled by soil/clay?
Hello to everybody, I have three different cropping sites soil samples of three different years, I want to compare the leaching of nitrate with the first, year. my first question is how to convert the NO3-N content of mg N/kg TO Kg/ha? and another question, how I will calculate the number of % of samples leashing increased or decreased in comparison to the first year. waiting for your valuable answer.
I am did SEM /EDS analysis on some solid samples after leaching and the EDS detected a possible increase in some of the elemental components on the surface of the samples. though it is qualitative i want to know how to make good inferences from this qualitative analysis how can i do that?
I am developing a soil column experiment to study antibiotic transport and attenuation. Most works in the literature perform a saturation with a CaCl2 solution in the soil before performing the leaching experiment. I would like to know the reason for this saturation with CaCl2. I have not found any work that explains the reason for this saturation.
I would be very grateful for any help.
This question I am arising out of curiosity. Assuming nano porous ball (500 um diameter) loaded with NA+ and Cl- poured into water.
I am measuring the leaching of ions from the ball into water as soon as I pour them into the water. There are two conditions (1) no electric field has been applied (2) electric field is applied (the water is between two electrodes). On the electric field, electrophoretic mobility will enhance the mobility of ions in a particular direction, however, will it enhance a much faster rate than the concentration-dependent diffusion process.
Notes: I am not good at reading scientific mathematical equation. So I am throwing this question after failing to understand some of the relevant scientific articles. Any help/advice to reach the answer or direct answer itself will be appreciated.
Has anyone ever used a mini autoclave for parameter requirements of 30bar and 220degrees celcius safely for leach simulations? If yes, can you please share where such a unit was purchased? If not what other ways have been used to simulate a similar process?
I want to know the threshold limit for the leaching of various inorganic anions, metals, ammonia, bicarbonates etc. from mined fine fraction from municipal solid waste?