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首页> 外文期刊>Environmental Science & Technology >Isolation of Marine Sediment Colloids and Associated Polychlorinated Biphenyls: An Evaluation of Ultrafiltration and Reverse-Phase Chromatography
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Isolation of Marine Sediment Colloids and Associated Polychlorinated Biphenyls: An Evaluation of Ultrafiltration and Reverse-Phase Chromatography

机译：海洋沉积物胶体和相关多氯联苯的分离：超滤和反相色谱的评价

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摘要

Environmental colloids are suspected of having significant effects on nonpolar organic contaminant geochemistry, transport, and bioavailability. However, environmental data on colloid—contaminant interactions is limited because isolating colloids from the dissolved and particulate phases is problematic. In this study, two practical methods using ultrafiltration and reverse-phase chromatography were evaluated for isolating environmentally contaminated marine sediment interstitial water colloids and associated PCBs. In assessing each method, ultrafiltration demonstrated extensive sorption of radiolabeled nonpolar compounds ( > 90%) and a re-occurring breakthrough phenomena, both of which compromise the method for accurately assessing colloid—PCB interactions. Conversely, C_(18) reverse-phase chromatography, performed using laboratory-packed columns, generated reproducible organic carbon-normalized colloidal partitioning coefficients (K_(coc)) that agreed with literature and theoretical considerations. Evaluations of sample flow rate and prefiltration size along with potential for C_(18) bed saturation indicated that these parameters have only a minor (e.g., less than a factor of 2) effect on the calculated contaminant distribution coefficients. Of the two methods evaluated, reverse-phase chromatography was the most promising for quantifying environmental colloid—PCB interactions.
机译：怀疑环境胶体对非极性有机污染物的地球化学，运输和生物利用度有重大影响。但是，关于胶体与污染物相互作用的环境数据是有限的，因为从溶解相和颗粒相中分离胶体是有问题的。在这项研究中，评估了两种使用超滤和反相色谱的实用方法，用于分离受环境污染的海洋沉积物间隙水胶体和相关的PCB。在评估每种方法时，超滤证明了放射性标记的非极性化合物的广泛吸附（> 90％）和再次出现的突破现象，这两者均损害了准确评估胶体与PCB相互作用的方法。相反，使用实验室填充柱进行的C_（18）反相色谱产生可再现的有机碳标准化胶体分配系数（K_（coc）），与文献和理论考虑相一致。对样品流速和预过滤大小以及C_（18）床饱和潜力的评估表明，这些参数对计算出的污染物分布系数影响很小（例如，小于2倍）。在评估的两种方法中，反相色谱法是定量分析环境胶体与PCB相互作用的最有前途的方法。

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