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Compound specific techniques can also be applied to food web studies where the lipids, carbohydrates, amino acids, etc., from different sources can be characterized isotopically, allowing more precise determinations of the contributions from different organisms to consumers.A multi-isotope approach is almost always beneficial ("the more isotopes the merrier! Carbon-13 investigations are often supplemented by C and d37Cl of chlorinated solvents such as TCE and BTEX to identify the sources of the contaminants in groundwater, and the degradation reactions that may remediate the pollution plumes.The internationally accepted radiocarbon dating reference is 95% of the activity, in 1950 AD, of the NBS oxalic acid normalized to C activity: » 50 pmc ‘real world’ systems are somewhere in between open and closed and the correction models mentioned above and described in Clark and Fritz (chapter 8) have to be applied.We no longer recommend adding a small amount of Na OH to the sample.The challenge in C content of groundwater at the time of recharge, i.e., at the time when groundwater is isolated from exchange with the soil air and moves away from the water table.

The primary reactions that produce DIC are: (1) weathering of carbonate minerals by acidic rain or other strong acids; (2) weathering of silicate minerals by carbonic acid produced by the dissolution of biogenic soil COC value exactly intermediate between the compositions of the carbonate and the carbonic acid.Because of the long residence time for groundwater in the hydrologic cycle, the last few decades have seen expanding study of groundwater systems.It is therefore important to continually refine our interpretation of hydrogeologic, geochemical and isotopic data to better understand the spatial and temporal movement of water in the subsurface.uses cookies to personalize content, tailor ads and improve the user experience. By using our site, you agree to our collection of information through the use of cookies.

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