Selenium removal by constructed wetlands: role of biological volatilization

Article Abstract:

Biological volatilization appears to be an effective way of removing selenium (Se) effluents discharged by oil refineries. Constructed wetland proved highly effective in removing Se from selenite-contaminated oil refinery wastewater, removing as much 89% of the contaminant. The mechanism by which Se was removed is through immobilization of the contaminant into sediments and plant tissues where Se concentrations reached -5 and -15 mg kg-1, respectively.

Selenium, Selenium (Chemical element)

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Temporally variable freshwater sources of dissolved chromium to the San Francisco Bay Estuary

Article Abstract:

Sediments within the San Francisco Bay Estuary appear to be the main source and a sink in the geochemical cycle of chromium, as evidenced by the presence of dissolved chromium fluxes in sediments. Direct anthropogenic chromium inputs are found to be small compared to the high-flow fluvial inputs but could be as large as low-flow dissolved inputs.

Chromium, Chromium (Metal), Geochemical cycles

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Silver in sediments from the St. Lawrence River and estuary and the Saguenay Fjord

Article Abstract:

Researchers analyzed sample cores of soil sediments collected from the St. Lawrence River and Estuary and was able to determine the widespread dispersion level of silver in the river.

United States, Science & research, Silver, Measurement, Pollution, Precious metal products, Saint Lawrence River

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