Physicochemical speciation of trace elements in river waters by size fractionation

Article Abstract:

Size fractionation was used for the physicochemical speciation of trace elements found in river water samples taken from the Tamagawa River and Sagamigawa River in Japan. Thirty-nine trace elements were fractionated into different molecular weight ranges and sizes with the use of filtration and ultrafiltration. Alkali elements were found to occur in the samples as simple inorganic ions. Aluminum, vanadium, antimony, gold and uranium were present as relatively simple hydroxo anions. Some of the rare earth elements formed soluble complexes with organic ligands.

Chemistry, Analytic, Analytical chemistry

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Phase associations and mobilization of iron and trace elements in Coeur d'Alene Lake, Idaho

Article Abstract:

Sediments taken from Coeur d'Alene Lake, ID with -0.5 m gravity cores were found to be highly reduced. The trace elements detected in the sediments are predominantly associated with an operationally defined sulfidic phase. Results point to a possibility that trace elements could move into overlying waters due either to lake eutrophication or the development of a seasonally anoxic hypolimnion. Metal sulfide formation and metal binding with organic material appear to control the mobilization of most trace elements.

Coeur d'Alene, Idaho, Water pollution, Iron, Iron (Metal)

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Identification of estrogenic chemicals in STW effluent. 1. chemical fractionation and in vitro biological screening

Article Abstract:

The major estrogenic chemicals present in sewage-treatment works (STW) effluents were efficiently isolated and identified using chemical fractionation and in vitro assay. The natural hormones 17beta-estradiol, estrone and the synthetic hormone 17alpha-ethynylestradiol were isolated from estrogenic fractions of sewage extracts. Results reveal that natural and synthetic hormones cause vitellogenin synthesis in male fish placed downstream of effluent discharges from STWs that receive mainly domestic inputs.

Environmental aspects, Sewage, Sterols

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