Pesticides in air and water

Seiber JN, Glotfelty DW, Lucas AD, et al. 1990. A multiresidue method by high performance liquid chromatography-based fractionation and gas chromatographic determination of trace levels of pesticides in air and water. Arch Environ Contam Toxicol 19 583-592. 

Sediment is an important media for the transformation of POPs in the environment. Many years after production has ceased and the ban on the use of POP pesticides globally, research in other countries indicates that sediment has the highest concentrations of POP pesticides, as compared to soil, water, and air. Without emission sources of POP pesticides on land, sediment in some water bodies, especially inland lakes, became the source of POP pesticides in air and water. The recent research in China on sediments of inland lakes and costal areas has corroborated this finding. 

While a -HCH is one of the most frequently studied chiral legacy pesticides in air and water, only limited measurements have been made of its enantiomers in soils and sediments, given its relatively low propensity to sorb to natural organic matter compared to other POPs (log Kg of 3.9 [32]). A depletion of (+)-a-HCH (EF = 0.39) was observed in surficial sediments of the North water Polynya [137]. This value was more nonracemic than the water column composition (EF = 0.45)[137],suggestingeitherpreferentialmicrobialdegradationof(+)-a-HCHasit descended in the water column [127] and/or further degradation once deposited in sediments. 

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See also in sourсe #XX -- [ ]

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