John Wiley & Sons, Ltd.

Evaluating the sorption of organophosphate esters to different sourced humic acids and its effects on the toxicity to Daphnia magna

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Because of large usage as flame retardants and additives, organophosphate esters (OPEs) are widely detected in the environment and regarded as emerging contaminants. However, the sorption of OPEs to organic matter and its effects have scarcely been studied. In the present study, the sorption of nine commonly used OPEs to four representative humic acids (HAs) including Elliott Soil HA, Suwannee River HA, Aldrich HA and Acros HA, in the range of 0–50 mg/L dissolved organic carbon (DOC), was evaluated with negligible‐depletion solid phase micro‐extraction (nd‐SPME), and verified by its impacts on the toxicity to aquatic invertebrate Daphnia magna. While the high‐KOW OPEs (logKOW = 4.51 − 6.64) associated to HAs mainly by hydrophobic interaction with KDOC in the range of 102.22–105.31, the sorption of low‐KOW OPEs (logKOW = − 0.65–2.59) to HAs was not hydrophobic interaction dominant with KDOC in the range of 103.47–104.29. These results were corroborated by the effects of HAs on the acute toxicity of three high‐KOW OPEs to Daphnia magna. While the sorption of OPEs to Suwannee River HA was weak and had negligible effects on the toxicity of high‐KOW OPEs, the presence of terrestrial Acros HA (50 mg/L DOC) significantly decreased the toxicity for 53%–60%. The results indicated that the strong sorption between high‐KOW OPEs and terrestrial HA might affect their transportation and bioavailability. Environ Toxicol Chem © 2013 SETAC

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