Geochemistry, Isotope Geochemistry, and Geological Systems.

• Ivan Biscarreta

  How to convert mg unit of SI to weight unit of SIO2? can somebody help me?

  A way to express concentration of Si in natural water is Mg/l. Can I convert that unit into oxides unit (SIO2) ??
• Rohit Kuvar

  Does all Barium and Strontium in river water come from dissolution of biotite in silt and clay fraction of alluvial sediments?

  In alluvial sediments, there is approximately 40% mica present

  Recent replies ⋅ Show All (9)

  • 
    Christian Mavris replied

    Sr is released during biotite, feldspar, plagioclase, calcite weathering...however, also apatite can be quite a source!

    3 days ago
• Akram Ansari

  Preparation of Amorphous Iron Oxides (Ferrihydrites)

  What is the best method to prepare " Amorphous Iron Oxides (Ferrihydrites)" in a normal chemical laboratory?

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    Julia Michelle Kotler replied

    Agreed with the above reference- it is a good book and the procedures are easy to follow either a starting point for development, or a standard protocol. Preparation of the phases are well explained.

    18 days ago
• Akram Ansari

  Simulation of Natural Iron Rich Water

  Does anyone know how to simulate iron rich water in laboratory, which is exactly same as iron rich natural water?Which salt is most suitable, FeCl3 or Fe(SO4)3?

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    Prof.agastaraju Hariharan replied

    Ferric sulphate

    24 days ago
• Babatunde Olanipekun

  Clumped-Isotope Analyses

  Does anyone know who I can contact for clumped-Isotope analyses in carbonates?

  Recent replies ⋅ Show All (11)

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    Jordon Bright replied

    I haven't run clumped isotopes before, but am aware that it is a much longer process and takes much larger sample sizes than standard isotopes. Memory says the sample size needs to be > 5 gm for 18O,I haven't run clumped isotopes before, but am aware that it is a much longer process and takes much larger sample sizes than standard isotopes. Memory says the sample size needs to be > 5 gm for 18O, and you only get 4 or 5 results per day.

    Apr 24, 2012
• Prakasam Muthusamy

  How to analyze Major and Trace elements in Sea sediments for XRF analysis. I am getting High Na % in my samples.

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    Jurgen Schnellrath replied

    I´ve had a similar problem analizing minerals with virtually no Na content, but the EDXRF-analysis gave very high sodium contents (about 10% Na2O!). It was a software problem of this particularI´ve had a similar problem analizing minerals with virtually no Na content, but the EDXRF-analysis gave very high sodium contents (about 10% Na2O!). It was a software problem of this particular equipment. When I used an EDXRF-spectrometer from another firm, the problem was solved. I think that there must have been an overlap of peaks and that particular software interpreted it as Na.

    Apr 23, 2012
• José Purri

  Are we able to control or predict carbon cycle?

  In the carbon cycle, which compartment is still poorly understood or studied? Do we rely on our current estimates? Can we make all the connections of these compartments: atmosphere, land and ocean?In the carbon cycle, which compartment is still poorly understood or studied? Do we rely on our current estimates? Can we make all the connections of these compartments: atmosphere, land and ocean? Currently, what is missing on C & N cycle models?

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    Michael Clark replied

    Here I am replying to my own reply: If you think about the carbon cycle, it is a portion of a larger man made change. We remove elements from inside the Earth, and through combustion (chemicalHere I am replying to my own reply: If you think about the carbon cycle, it is a portion of a larger man made change. We remove elements from inside the Earth, and through combustion (chemical processes) we convert the elements into primarily Carbon Dioxide and Water. The other things we "mine" or extract are mostly metals that we find useful for various purposes. If you view the extraction of material from the Earth as a closed system, then there are only a few things that can happen to the extracted materials. 1) They can end up atop the Land. (Asphalt, Concrete, Structures, Vehicles Etc.) 2) They can end up in the Atmosphere (CO2, Water, Particulates, Sulfur Dioxide) 3) They can end up in the Ocean (Plastics, Water, Chemicals, Soils....) 4) They can end up buried back in the Earth (Landfills, Deep well injection, Shallow well injection concrete to fill in mine tunnels) Of these processes, the ones that cause current and future problems are the ones that make large changes to the Volume of the Oceans, and, the Volume and Composition of the Atmosphere. The first (Changes in the Volume of the Oceans) is a Human Inconvenience. The solution is move up, move out, or fight it with expensive engineering solutions as has been done along both sides of the Mississippi River. The second (Increase in the Volume and Composition of the Atmosphere), is the real problem area. Perhaps one solution would be to stop using Carbon as a substance to move goods and people. One partial solution could be to use the Sun to make Hydrogen and Oxygen from water, compress these two gasses, and burn them in modified Internal combustion engines to produce water, which nature uses to make clouds, rain, snow, fog, Etc. which ends up in the oceans. The advantage is that it is a closed system that does not require a solution to a Carbon problem as it does not create a carbon Problem in the Atmosphere. Can you imagine the advantages of a liquid Hydrogen, Liquid Oxygen propulsion system.

    Apr 22, 2012
• Narayan Bhandari

  How different is As(III)/Cr(VI) oxidation/reduction potential compared to aqueous phase and when adsorbed onto minerals (oxides, hydroxides)

  Any suggestions, link or article is much appreciated.

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    C. Mei-Ling Hamilton replied

    Perhaps this article might be of interest to you. It is as follows: Geochemical Reduction of Hexavalent Chromium in the Trinity Sand Aquifer (HENDERSON,Perhaps this article might be of interest to you. It is as follows: Geochemical Reduction of Hexavalent Chromium in the Trinity Sand Aquifer (HENDERSON, 1994) http://info.ngwa.org/gwol/pdf/941560498.PDF

    Apr 22, 2012
• Ratan Mohapatra

  Aluminosilicate Glass: we have a box of alumino silicate glass we bought for building a low helium diffusion extraction line. As we are going ss, I was wondering if anyone is interested it.
• Akram Ansari

  Does anybody have literature recommendations regarding cation adsorption on ferrihydrite?

  Cation adsorption on Ferrihydrite

  

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    Akram Ansari replied

    Thank you all for kind response. Dear all I have no access to science direct and ACS downloads. Therefore please be kind enough to e mail me above papers or send me direct download links ifThank you all for kind response. Dear all I have no access to science direct and ACS downloads. Therefore please be kind enough to e mail me above papers or send me direct download links if possible. Patric Lindqvist-Reis - the book looks good.but how can i get this.

    Apr 16, 2012
• Jishnu Balagangadharan

  Genesis of sulphide mineralisation?

  What kind of co-relations can be used on geochemical data in educing the genesis of sulphide mineralisation. please add comments. Also suggestions are invited on different methods of geochemicalWhat kind of co-relations can be used on geochemical data in educing the genesis of sulphide mineralisation. please add comments. Also suggestions are invited on different methods of geochemical studies on the same

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    Jishnu Balagangadharan replied

    Dear all Thanks for the responses I wish to discuss on Sulphide associated to hydrothermal gold mineralisation and its paragenesis

    Apr 2, 2012
• Jayanta Sircar

  Can somebody suggest a method of determining silica in sediments without using sulphuric acid hydrofluoric acid treatment.

  I am using nitric acid digestion of sediments followed by HF treatment. Repeat analysis shows varying amount of silica. I will have to determine sodium potassium, calcium, iron and manganese fromI am using nitric acid digestion of sediments followed by HF treatment. Repeat analysis shows varying amount of silica. I will have to determine sodium potassium, calcium, iron and manganese from subsequent procedure.

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    Luis Fernando Vásquez-Bedoya replied

    I am using 0.5 g of dry sediment samples digested in closed Teflon PFA containers on a hot plate (~120 °C overnight) using a mixture of 5:4:1 HNO3:HCl:HF

    Mar 23, 2012
• Priyabrata Das

  I want to do isotope geochemical analysis (Sm-Nd) of a medium to coarse grained sandstone.How much sample (as a representative that area) is needed for further homogenization and analysis?

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    Priyabrata Das replied

    Sir, I want to know the provenance the sand stone. and apart from the heavy minerals analysis (Zircon, Monazite), Sm-Nd isotope technique is the most useful tools to identify the sediment provenance.Sir, I want to know the provenance the sand stone. and apart from the heavy minerals analysis (Zircon, Monazite), Sm-Nd isotope technique is the most useful tools to identify the sediment provenance. Your point is really good, but, do you know the procedure of cement separation from an compact sand stone?

    Jan 17, 2012
• Bryant William Platt

  Chemistry of Rhyolite Flows

  Does anyone know of any good studies discussing rhyolite intraflow chemical variability?

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    Bryant William Platt replied

    Thanks!

    Jan 12, 2012
• Mohamed Fahmy Hussein

  A great e-book on geochemistry and isotope geochemistry

  http://www.imwa.info/white-geochemistry.html

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    Samir Al-Gamal replied

    sure by analyzing C-14 of Coral reefs you can configurate many of environmental aspects like growth rate...dating and many other aspects

    Jan 11, 2012