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首页> 外文期刊>Environmental toxicology and chemistry >A Passive Sampler Based On Solid-phase Microextraction For Quantifying Hydrophobic Organic Contaminants In Sedimentpore Water
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A Passive Sampler Based On Solid-phase Microextraction For Quantifying Hydrophobic Organic Contaminants In Sedimentpore Water

机译：基于固相微萃取的被动式进样器定量沉淀孔水中的疏水性有机污染物

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Sediment-quality assessment often is hindered by the lack of agreement between chemical and biological lines of evidence. One limitation is that the bulk sediment toxicant concentration, the most widely used chemical parameter, does not always represent the bioavailable concentration, particularly for hydrophobic organic compounds (HOCs) in highly contaminated sediments. In the present study, we developed and tested a pore-water sampler that uses solid-phase microextraction (SPME) to measure freely dissolved (bioavailable) HOC concentrations. A single polydimethylsiloxane (PDMS)-coated SPME fiber is secured in a compact, protective housing that allows aqueous exchange with whole sediment while eliminating direct contact with sediment particles. Fibers with three PDMS coating thicknesses were first calibrated for 12 model HOCs of current regulatory concern. Precalibrated samplers were exposed to spiked estuarine sediment in laboratory microcosms to determine the time to equilibrium and the equilibrium concentrations across a range of sediment contamination. Time to equilibrium ranged from 14 to 110 d, with 30 d being sufficient for more than half the target HOCs. Equilibrium SPME measurements, ranging from 0.009 to 2,400 ng/L, were highly correlated with but, in general, lower than HOC pore-water concentrations determined independently by liquid-liquid extraction. This concept shows promise for directly measuring the freely dissolved concentration of HOCs in sediment pore water, a previously difficult-to-measure parameter that will improve our ability to assess the impacts of contaminated sediments.
机译：沉积物质量评估通常由于化学和生物学证据之间缺乏一致性而受到阻碍。一个局限性是，最广泛使用的化学参数，即大量沉积物的有毒物质浓度，并不总是代表生物利用度，特别是对于高度污染的沉积物中的疏水性有机化合物（HOC）。在本研究中，我们开发并测试了使用固相微萃取（SPME）来测量自由溶解（生物可利用）HOC浓度的孔隙水采样器。单根聚二甲基硅氧烷（PDMS）涂层的SPME纤维固定在紧凑的保护性外壳中，该外壳允许与整个沉积物进行水交换，同时避免与沉积物颗粒的直接接触。首先针对当前监管关注的12种模型HOC校准具有三种PDMS涂层厚度的光纤。在实验室缩影中，将预先校准的采样器暴露在加标的河口沉积物中，以确定达到平衡的时间以及整个沉积物污染范围内的平衡浓度。达到平衡所需的时间为14到110 d，其中30 d足以满足一半以上的目标HOC。 SPME的平衡测量值在0.009到2,400 ng / L之间，与液-液萃取独立确定的HOC孔隙水浓度高度相关，但通常低于HOC孔隙水浓度。这个概念显示了直接测量沉积物孔隙水中HOCs的自由溶解浓度​​的希望，这是以前难以测量的参数，它将提高我们评估受污染沉积物影响的能力。

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