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首页> 外文期刊>Environmental Science & Technology >Distribution of Phthelate Esters in a Marine Aquatic Food Web: Comparison to Polyohlorinated Biphenyls
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Distribution of Phthelate Esters in a Marine Aquatic Food Web: Comparison to Polyohlorinated Biphenyls

机译：海洋水生食物网中邻苯二甲酸酯的分布：与多卤代联苯的比较

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Dialkyl phthalate esters (DPEs) are widely used chemicals, with over 4 million tonnes being produced worldwide each year. On the basis of their octanol-water partition coefficients (k{sub}(ow)), which range from 10{sup}1.61 for dimethyl phthalate to 10{sup}9.46 for di-iso-decyl phthalate, certain phthalate esters have the potential to bioconcentrate and biomagnify in aquatic food webs. However, there are no reported field studies on the trophodynamics of phthalate ester in aquatic food webs. This study reports the distribution of 8 individual phthalate esters (i.e., dimethyl, diethyl, di-iso-butyl, di-n-butyl, butylbenzyl, di(2-ethylhexyl), di-n-octyl, and di-n-nonyl) and 5 commercial isomeric mixtures (i.e., di-iso-hexyl (C6), di-iso-heptyl (C7), di-iso-octyl (C8), di-iso-nonyl (C9), and di-iso-decyl (C10)) in a marine aquatic food web. DPE concentrations were determined in 18 marine species, representing approximately 4 trophic levels. Co-analysis of DPEs and 6 PCB congeners (i.e., PCB-18, 99, 118, 180, 194, and 209) in all samples produced a direct comparison of the bioaccumulation behavior of PCBs and DPEs. Lipid equivalent concentrations of the PCBs increased with increasing trophic position and stable isotope ratios (δ15{sup left}N). The Food-Web Magnification Factor (FWMF) of the PCB congeners ranged from 1.8 to 9.5. Lipid equivalent concentrations of low and intermediate molecular weight DPEs (i.e., C1-C7 DPEs: dimethyl, diethyl, di-iso-butyl, di-n-butyl, benzylbutyl, and C6 and C7 isomers) did not exhibit statistically significant trends with trophic position or stable nitrogen isotope ratios (δ15{sup left}N) in the food web and FWMFs were not significantly different from 1. Lipid equivalent concentrations of the high-molecular-weight DPEs (i.e., C8-C10 DPEs: di(2-ethylhexyl), di-n-octyl, di-n-nonyl, C8, C9, and C10) declined significantly with increasing trophic position and stable isotope ratios (δ15{sup left}N), producing FWMFs between 0.25 and 0.48. These results show that all DPEs tested did not biomagnify in the studied aquatic food web whereas PCBs did biomagnify.
机译：邻苯二甲酸二烷基酯（DPE）是广泛使用的化学品，全世界每年生产超过400万吨。根据它们的辛醇-水分配系数（k {sub}（ow））（范围从邻苯二甲酸二甲酯的10 {sup} 1.61到邻苯二甲酸二异癸酯的10 {sup} 9.46），某些邻苯二甲酸酯具有在水食物网中生物富集和生物放大的潜力。但是，尚无关于邻苯二甲酸酯在水生食物网中的营养动力学的田间研究的报道。这项研究报告了8种邻苯二甲酸酯的分布（即二甲基，二乙基，二异丁基，二正丁基，丁基苄基，二（2-乙基己基），二正辛基和二正壬基）和5种市售异构体混合物（即，二异己基（C6），二异庚基（C7），二异辛基（C8），二异壬基（C9）和二异戊基）海洋水食物网中的癸基（C10））。测定了18种海洋物种中DPE的浓度，大约代表4种营养水平。对所有样品中DPE和6种PCB同系物（即PCB-18、99、118、180、194和209）的共同分析可以直接比较PCB和DPE的生物蓄积行为。多氯联苯的脂质当量浓度随着营养位置的增加和稳定的同位素比（δ15{sup left} N）而增加。 PCB同类物的食物网放大系数（FWMF）为1.8至9.5。低分子量和中等分子量DPE（即C1-C7 DPE：二甲基，二乙基，二异丁基，二正丁基，苄基丁基和C6和C7异构体）的脂质当量浓度在营养上没有显示出统计学上的显着趋势食物网和FWMF中的位置或稳定的氮同位素比（δ15{sup left} N）与1的差异不显着。高分子量DPE（即C8-C10 DPEs：di（2-乙基己基，二正辛基，二正壬基，C8，C9和C10）随着营养位置的增加和稳定的同位素比（δ15{N}）显着下降，产生的FWMF在0.25和0.48之间。这些结果表明，所测试的所有DPE在研究的水生食物网中均未生物放大，而PCBs则具有生物放大。

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