John Wiley & Sons, Ltd.

Comparing sorption behavior of pyrethroids between formulated and natural sediments

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Courtesy of John Wiley & Sons, Ltd.

Formulated sediments are recommended for use in toxicity tests to achieve standardized evaluations. However, the organic matter used in formulated sediments may differ qualitatively from that in natural sediments, which may lead to different chemical partition patterns and hence, different toxicity effects. By deriving KOC and KDOC for 8 pyrethroid insecticides from three formulated and five natural sediments, we characterized the differences between formulated and natural sediments in pesticide sorption. For all pyrethroids, the mean values of KOC and KDOC of formulated sediments were 2 to 3 and 3 to 10 times smaller than those of natural sediments, respectively., The two formulated sediments containing α‐cellulose or Manitoba peat showed significantly (p<0.0001) smaller KOC and KDOC values than natural sediments based on statistical analyses , while the difference was not significant for the formulated sediment containing New Brunswick peat. The KOC values were closely correlated (p<0.001) with soot carbon content, while the amount of carboxylic or phenolic functional groups may have affected KDOC. Therefore, the source and quality of organic matter is likely the most important factor in formulated sediments, and must be standardized to provide consistency in sediment toxicity tests. Environ. Toxicol. Chem. © 2013 SETAC

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