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首页> 外文期刊>Environmental Science & Technology >Field Evaluation and in Situ Stress Testing of the Organic-Diffusive Gradients in Thin-Films Passive Sampler
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Field Evaluation and in Situ Stress Testing of the Organic-Diffusive Gradients in Thin-Films Passive Sampler

机译：薄膜无源采样器中有机扩散梯度的现场评估和原位应力测试

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摘要

The organic-diffusive gradients in thin-films (o-DGT) technique has emerged as a promising aquatic passive sampler that addresses many of the challenges associated with current sampling tools used for measurement of polar organic contaminants. This study represents the first comprehensive field evaluation of the o-DGT in natural surface waters, across a wide suite of polar pharmaceuticals and pesticides. We explore the utility and limitations of o-DGT as a quantitative measurement tool compared to grab sampling and the polar organic chemical integrative sampler (POCIS) across four connected agricultural and wastewater-influenced freshwater systems spanning 600 km from the U.S. border to northern Manitoba, Canada. Overall, the suite of analytes detected with o-DGT and POCIS was similar. Concentrations in water estimated using o-DGT were greater than concentrations estimated from POCIS in 71 of 80 paired observations, and on average, the estimates from o-DGT were 2.3-fold greater than estimates from POCIS. Grab sample concentrations suggested that the systematic underestimation with POCIS were largely a result of sampling rate variation related to flow rate and boundary-layer effects, an issue reported consistently in the POCIS literature. These comprehensive measurements in an agriculturally influenced fast-flowing river, long-term sampling (40 days) in a large dilute lake system, deployments in wastewaters, and under ice at near-freezing temperatures represent effective stress testing of o-DGT under representative and challenging conditions. Overall, its strong performance and improved accuracy over POCIS supports its use as a robust, quantitative, and sensitive measurement tool for polar organic chemicals in aquatic systems.
机译：薄膜中的有机扩散梯度（o-DGT）技术已成为一种有前途的水生无源采样器，它可以解决与用于测量极性有机污染物的当前采样工具相关的许多挑战。这项研究代表了天然地表水中o-DGT的首次全面现场评估，涵盖了多种极性药物和农药。与从美国边界到曼尼托巴北部600公里的四个相连的受农业和废水​​影响的淡水系统相比较，我们尝试了o-DGT作为定量测量工具的实用性和局限性，与抓取采样和极性有机化学综合采样器（POCIS）相比，加拿大。总体而言，使用o-DGT和POCIS检测到的分析物套件相似。在80个配对观测中的71个中，使用o-DGT估算的水中浓度高于POCIS的估算浓度，平均而言，o-DGT的估算值比POCIS的估算值高2.3倍。捕获样品的浓度表明POCIS的系统低估很大程度上是由于采样率与流速和边界层效应有关而引起的，POCIS文献一致报道了这一问题。这些在农业影响快速流动的河流中的全面测量，在大型稀湖系统中的长期采样（> 40天），废水中的部署以及接近冰点的冰下的测量，代表了o-DGT在有效压力下的有效测试和具有挑战性的条件。总体而言，与POCIS相比，其强大的性能和更高的精度支持将其用作水生系统中极性有机化学品的可靠，定量和灵敏的测量工具。

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  • 来源
    《Environmental Science & Technology》 |2018年第21期|12573-12582|共10页
  • 作者

    Challis Jonathan K.; Stroski Kevin M.; Luong Kim H.; Hanson Mark L.; Wong Charles S.;

  • 作者单位

    Univ Winnipeg, Dept Chem, Richardson Coll Environm, Winnipeg, MB R3B 2E9, Canada;

    Univ Manitoba, Dept Chem, Winnipeg, MB R3T 2N2, Canada;

    Univ Manitoba, Dept Geog & Environm, Winnipeg, MB R3T 2N2, Canada;

    Univ Winnipeg, Dept Environm Studies & Sci, Richardson Coll Environm, Winnipeg, MB R3B 2E9, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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