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首页> 外文期刊>Environmental toxicology and chemistry >EVALUATION OF POLY(ETHYLENE-CO-VINYL ACETATE-CO-CARBON MONOXIDE) AND POLYDIMETHYLSILOXANE FOR EQUILIBRIUM SAMPLING OF POLAR ORGANIC CONTAMINANTS IN WATER
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EVALUATION OF POLY(ETHYLENE-CO-VINYL ACETATE-CO-CARBON MONOXIDE) AND POLYDIMETHYLSILOXANE FOR EQUILIBRIUM SAMPLING OF POLAR ORGANIC CONTAMINANTS IN WATER

机译：聚（乙烯-乙酸乙烯酯-一氧化碳）和聚二甲基硅氧烷的平衡水样中极性有机污染物的评估

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摘要

The aim of the present study was to develop a passive absorptive equilibrium sampler that would enable the determination of the concentrations of polar organic compound (POC) in water more efficiently than existing techniques. To this end, a novel plastic material, poly(ethylene-co-vinyl acetate-co-carbon monoxide) (PEVAC), was evaluated and the results were compared with an existing silicone-based passive absorptive equilibrium device. Seven compounds (imidacloprid, carbendazim, metoprolol, atrazin, carbamazepine, diazinon, and chlorpyrifos), a mixture of Pharmaceuticals, and pesticides with a logarithmic octanol-water partition coefficient ranging from 0.2 to 4.77 were selected as model substances for the experiments. The results showed that six of the seven selected POCs reached distribution equilibrium within 4 d in the two materials tested. A linear relation with a regression coefficient of more than 0.8906 between the established logarithmic absorbent-water partition coefficient and the calculated logarithmic dissociation partition coefficient of the selected compounds in the two polymers was observed. The correlation between these two coefficients was within one order of magnitude for the compounds that reached equilibrium in the two polymers, which demonstrates that both materials are suitable for mimicking biological uptake of POCs. The PEVAC material showed an enhanced sorption for all selected compounds compared to the silicone material and up to five times higher enrichment for the most polar compound. Fluorescence analysis of the sampler cross-section, following the uptake of fluoranthene, and proof that the sorption was independent of surface area variations demonstrated that the PEVAC polymer possessed absorptive rather than adsorptive enrichment of organic compounds.
机译：本研究的目的是开发一种被动吸收式平衡采样器，该采样器将比现有技术更有效地测定水中的极性有机化合物（POC）浓度。为此，评估了一种新型塑料材料，聚（乙烯-乙酸乙烯酯-一氧化碳-一氧化碳）（PEVAC），并将结果与​​现有的基于有机硅的被动吸收平衡装置进行了比较。选择七种化合物（吡虫啉，多菌灵，美托洛尔，阿特拉津，卡马西平，二嗪农和毒死rif），药物的混合物和辛醇-水分配系数的对数范围为0.2至4.77的农药作为实验的模型物质。结果表明，在两种测试材料中，七个选定的POC中有六个在4天内达到了分布平衡。观察到在两种聚合物中所选化合物的既定对数吸收水分配系数与计算出的对数解离分配系数之间的回归系数大于0.8906的线性关系。对于在两种聚合物中达到平衡的化合物，这两个系数之间的相关性在一个数量级之内，这表明这两种材料都适合模拟POC的生物吸收。与有机硅材料相比，PEVAC材料对所有选定化合物的吸附均增强，对于最具极性的化合物，其富集度最高可提高五倍。在吸收荧蒽后，对样品横截面进行荧光分析，并证明吸附与表面积无关，这表明PEVAC聚合物具有吸收性而不是吸附性富集有机化合物。

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