Cadmium dissertation in natural speciation water

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This study determined Cd speciation and release kinetics in a Cd-Zn cocontaminated alkaline paddy soil, under various flooding periods and draining conditions, by employing synchrotron-based techniques, and a stirred-flow kinetic method. Results revealed that varying flooding periods and draining conditions affected Cd speciation and its release kinetics. Cadmium carbonates were found as the major species at most flooding periods, while a small amount of cadmium sulfide was found after the soils were flooded for longer periods. Therefore, it is more likely that Cd and Ca will be present in the same mineral phases rather than Cd and Zn, although the source of these two latter elements may originate from the same surrounding Zn mines in the Mae Sot district. Similar records in OSTI. GOV collections:.
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Cadmium - Wikipedia

Free Cd2 concentration and Cd complexation by natural organic ligands in fresh water were determined by a technique involving ethylene diamine EN,1,2-diaminoethane ligand exchange and measurement by differential pulse anodic stripping voltammetry. The validity of the ligand exchange approach was demonstrated in a synthetic solution containing EDTA as a model ligand. The dissolved Cd concentrations range from 0. The reliability of the technique and relevant implications of the results in these waters are discussed.
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Aquatic Life Criteria - Cadmium

The emerging technique of DGT diffusive gradients in thin films is shown to be capable of performing new speciation measurements in situ in natural waters. In DGT, metals are bound to a resin layer after passing through a well-defined diffusion layer. DGT measured similar labile fractions to ASV, with detailed differences being consistent with a thicker diffusion layer allowing more dissociation of labile complexes and a slower diffusion of FA and HA complexes through the gel.
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