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首页> 外文期刊>Environmental toxicology and chemistry >Evaluating porewater polycyclic aromatic hydrocarbon-related toxicity at a contaminated sediment site using a spiked field-sediment approach
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Evaluating porewater polycyclic aromatic hydrocarbon-related toxicity at a contaminated sediment site using a spiked field-sediment approach

机译：使用加标场沉降法评估受污染沉积物位点的孔隙水与多环芳烃相关的毒性

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Although the complexity of contaminant mixtures in sediments can confound the identification of causative agents of adverse biological response, understanding the contaminant(s) of primary concern at impacted sites is critical to sound environmental management and remediation. In the present study, a stock mixture of 18 polycyclic aromatic hydrocarbon (PAH) compounds was prepared to reflect the variety and relative proportions of PAHs measured in surface sediment samples collected from discrete areas of a historically contaminated industrial estuary. This site-specific PAH stock mixture was spiked into nontoxic in-system and out-of-system field-collected reference sediments in dilution series spanning the range of previously measured total PAH concentrations from the region. Spiked sediments were evaluated in 10-d Leptocheirus plumulosus tests to determine whether toxicity in laboratory-created PAH concentrations was similar to the toxicity found in field-collected samples with equivalent PAH concentrations. The results show that toxicity of contaminated sediments was not explained by PAH exposure, while indicating that toxicity in spiked in-system (fine grain, high total organic carbon [TOC]) and out-of-system (course grain, low TOC) sediments was better explained by porewater PAH concentrations, measured using an antibody-based biosensor that quantified 3- to 5-ring PAHs, than total sediment PAH concentrations. The study demonstrates the application of site-specific spiking experiments to evaluate sediment toxicity at sites with complex mixtures of multiple contaminant classes and the utility of the PAH biosensor for rapid sediment-independent porewater PAH analysis. Environ Toxicol Chem 2018;37:893-902. (c) 2017 SETAC
机译：尽管沉积物中污染物混合物的复杂性可能会混淆对不良生物反应的病原体的识别，但了解受影响地区主要关注的污染物对于合理的环境管理和补救至关重要。在本研究中，准备了一种18种多环芳烃（PAH）化合物的混合料，以反映在从历史受污染的工业河口的不连续区域收集的表面沉积物样品中测得的PAH的种类和相对比例。将此特定场所的PAH储备混合物以稀释系列加标到无毒的系统内和系统外野外收集的参考沉积物中，稀释范围跨越该区域先前测得的总PAH浓度范围。在10天的Leptocheirus plumulosus测试中评估了尖刺的沉积物，以确定实验室创建的PAH浓度下的毒性是否类似于在现场收集的具有相同PAH浓度的样品中发现的毒性。结果表明，污染的沉积物的毒性不能通过PAH暴露来解释，而表明加标的系统内（细颗粒，高总有机碳[TOC]）和系统外（过程颗粒，低TOC）沉积物的毒性用基于抗体的生物传感器（对3至5个环的PAH进行定量）测量的孔隙水PAH浓度比总沉积物PAH浓度更好地解释了这一点。这项研究证明了针对特定地点的加标实验在评估具有多种污染物类别的复杂混合物的地点的沉积物毒性方面的应用，以及PAH生物传感器在快速进行与沉积物无关的孔隙水PAH分析中的实用性。 Environ Toxicol Chem 2018; 37：893-902。 （c）2017年SETAC

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