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Pesticides and heavy metals in sediments

Pesticides and heavy metals in sediments

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Uploaded 09 Oct 2013 by GRID-Arendal
Year: 2013 Author: GRID-Arendal
Description:
Several pollutants such as HCB, DDT and lindane were investigated during the 2001 survey. Generally, concentrations were low, except that of DDT and its compounds which exceeded NOAA quality standards at a number of locations in Azerbaijan and Iran. The Kura River was identified as a main source of such contamination (Mora and Sheikholeslami 2002). Furthermore, according to the same survey, lindane concentrations exceeded the Canadian (ISQG) sediment quality guideline value in the Russian sector, with concentrations of 609 pg/g compared with the quality guideline standard of 320 pg/g. Five years later, no significant changes in DDT concentration were recorded: at some sites in Azerbaijan and Iran, concentrations were still high – three times above the ISQG standard. A persisting problem due to the use of DDT was observed in the Volga Delta, Azerbaijan and Iran, despite the global ban. Nickel (Ni) was observed in high concentrations and exceeded the NOAA value of 21 µg/g in all t ...
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