Evaluating the sorption of organophosphate esters to different sourced humic acids and its effects on the toxicity to Daphnia magna
Evaluating the sorption of organophosphate esters to different sourced humic acids and its effects on the toxicity to Daphnia magna
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DOI：
10.1002/etc.2360
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发表时间：
2013-12
影响因子：
4.1
通讯作者：
Long Pang;Jing-fu Liu;Yongguang Yin;Mohai Shen
中科院分区：
文献类型：
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作者：
Long Pang;Jing-fu Liu;Yongguang Yin;Mohai Shen
由于有机磷酸酯作为阻燃剂和添加剂的大量使用，其在环境中被广泛检测并被视为新兴污染物。然而，OPEs对有机质的吸附及其影响的研究很少。在本研究中，9种常用的OPEs吸附4个代表性的腐殖酸-艾略特土壤腐殖酸，Suwannee河腐殖酸，奥德里奇腐殖酸，和Acros腐殖酸-在0 mg/L至50 mg/L的溶解有机碳（DOC）的范围内，进行了评估，可忽略消耗固相微萃取和验证其对水生无脊椎动物的毒性的影响。而具有高辛醇/水分配系数的OPEs（log KOW = 4.51 - 6.64）主要通过疏水性相互作用与腐殖酸相关，DOC分配系数（KDOC）在102.22至105.31范围内，低KOW OPEs的吸附（log KOW =-0.65至2.59）对腐殖酸的作用不是疏水作用主导的，KDOC在103.47至104.29之间。这些结果通过腐殖酸对3种高KOW OPEs对D. magna. OPEs对Suwannee河腐殖酸的吸附较弱，对高KOW OPEs的毒性影响可以忽略不计;然而，陆地Acros腐殖酸（50 mg/L DOC）的存在显著降低了53%至60%的毒性。结果表明，高KOW OPEs与陆生腐殖酸之间的强吸附可能会影响其迁移和生物有效性。环境毒理化学2013;32：2755-2761。© 2013 SETAC
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 9 commonly used OPEs to 4 representative humic acids—Elliott Soil humic acid, Suwannee River humic acid, Aldrich humic acid, and Acros humic acid—in the range of 0 mg/L to 50 mg/L dissolved organic carbon (DOC), was evaluated with negligible‐depletion solid‐phase microextraction and verified by its impacts on the toxicity to the aquatic invertebrate Daphnia magna. Whereas OPEs with a high octanol/water partition coefficient (log KOW = 4.51 − 6.64) were associated with humic acids mainly by hydrophobic interaction with DOC partition coefficient (KDOC) in the range of 102.22 to 105.31, the sorption of low‐KOW OPEs (log KOW = −0.65 to 2.59) to humic acids was not hydrophobic interaction–dominant, with KDOC in the range of 103.47 to 104.29. These results were corroborated by the effects of humic acids on the acute toxicity of 3 high‐KOW OPEs to D. magna. The sorption of OPEs to Suwannee River humic acid was weak and had negligible effects on the toxicity of high‐KOW OPEs; the presence of terrestrial Acros humic acid (50 mg/L DOC), however, significantly decreased the toxicity by 53% to 60%. The results indicated that the strong sorption between high‐KOW OPEs and terrestrial humic acid might affect their transportation and bioavailability. Environ Toxicol Chem 2013;32:2755–2761. © 2013 SETAC