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首页> 外文期刊>Environmental Science & Technology >Partition of endocrine-disrupting chemicals between colloids and dissolved phase as determined by cross-flow ultrafiltration
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Partition of endocrine-disrupting chemicals between colloids and dissolved phase as determined by cross-flow ultrafiltration

机译：错流超滤法测定破坏内分泌的化学物质在胶体和溶解相之间的分配

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Cross-flow ultrafiltration (CFUF) was developed first for the isolation of natural colloids and subsequently for determining the partition of selected endocrine-disrupting chemicals (EDCs) between river colloids and dissolved phase. In this study, a 1-kDa Millipore Pellicon 2 cartridge type CFUF system was validated using a range of molecular probes spiked in natural waters. Results show that good retention (> 80%) of high molecular weight (HMW, > 1 kDa) molecules and low retention of low molecular weight (LMW, < 1 kDa) molecules can be achieved at high concentration factor (cf) values in sampling mode or over long time scales in recirculation mode. The interactions between aquatic colloids and EDCs were studied by mixing EMS, water, and colloids previously isolated by CFUF for a certain duration, followed by the separation of the target compounds between the truly dissolved and colloid-bound phases by CFUF and analysis by gas chromatography-mass spectrometry (GC-MS). The kinetics of EDCs binding to colloids were relatively rapid, reaching equilibrium within 5 min. The mass balance of chosen EDCs through CFUF system was fully investigated, with good recovery for the relatively polar EDCs such as estrone and 17 beta-estradiol. On the basis of EDC sorption by colloids, the partition coefficient normalized to colloidal organic carbon content (K-coc) was 8.85 x 10(3), 1.50 x 10(4), 8.85 x 10(3), 4.87 x 10(4), and 1.59 x 10(4) mL/g for bisphenol A, estrone, 17 beta-estradiol, 17 alpha-ethynylestradiol, and 16 alpha-hydroxyestrone, respectively, which are comparable with the values reported in the literature. In addition, it has been shown that the Kcoc values of EDCs were relatively independent of their octanol-water partition coefficient (K-ow) values, suggesting the important role of different binding mechanisms other than nonspecific hydrophobic interaction between EDCs and natural colloids. As the CFUF-GC-MS method can be used to quantify very low concentration of pollutants and is not limited to fluorescent compounds, it has the potential to be a widely applicable separation/analytical tool for determining the partition of organic pollutants between colloidal materials and dissolved phase.
机译：错流超滤（CFUF）首先用于分离天然胶体，然后用于确定河流胶体和溶解相之间的选定内分泌干扰化学物质（EDC）的分配。在这项研究中，使用一系列掺入天然水中的分子探针验证了1-kDa的Millipore Pellicon 2弹药筒CFUF系统。结果表明，在高浓度因子（cf）值下，可以实现高分子量（HMW，> 1 kDa）分子的良好保留（> 80％）和低分子量（LMW，<1 kDa）分子的低保留模式或在循环模式下长时间使用。通过将EMS，水和先前通过CFUF分离的胶体混合一定时间，然后通过CFUF在真正溶解的相和胶体结合相之间分离目标化合物并通过气相色谱分析，研究了水胶体与EDC之间的相互作用-质谱（GC-MS）。 EDC与胶体结合的动力学相对较快，在5分钟内达到平衡。充分研究了通过CFUF系统选择的EDC的质量平衡，对于相对极性的EDC（如雌酮和17β-雌二醇）具有良好的回收率。根据胶体对EDC的吸附，归一化为胶体有机碳含量（K-coc）的分配系数为8.85 x 10（3），1.50 x 10（4），8.85 x 10（3），4.87 x 10（4） ），双酚A，雌酮，17β-雌二醇，17α-乙炔基雌二醇和16α-羟基雌酮的浓度分别为1.59 x 10（4）mL / g，与文献报道的值相当。另外，已经显示EDC的Kcoc值相对独立于它们的辛醇-水分配系数（K-ow）值，表明除了EDC与天然胶体之间的非特异性疏水相互作用之外，不同结合机制的重要作用。由于CFUF-GC-MS方法可用于量化极低浓度的污染物，并且不仅限于荧光化合物，因此它有可能成为一种广泛适用的分离/分析工具，可用于确定有机污染物在胶体材料和固体之间的分配。溶解相。

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