Monitoring Organic Pollutants in Waters Using the Diffusive Gradients in the Thin Films Technique: Investigations on the Effects of Biofouling and Degradation.,Environmental Science & Technology

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Monitoring Organic Pollutants in Waters Using the Diffusive Gradients in the Thin Films Technique: Investigations on the Effects of Biofouling and Degradation.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-25 , DOI: 10.1021/acs.est.0c00224
Runmei Wang ₁ , Kevin C Jones ₁ , Hao Zhang ₁

Affiliation

The diffusive gradients in thin films (DGT) passive sampling technique has been increasingly used to provide time-weighted average concentrations of the biorelevant fraction of organic contaminants in waters, with high spatial and temporal resolutions at low cost. This study was tested for the effects of biofouling and compound degradation/loss during sample handling/storage on the DGT measurement of a range of emerging organic pollutants. Biofouling was tested using biofilms collected from the influent and effluent of a typical urban wastewater treatment plant. Most (85%) target compounds showed no detectable effect on the DGT measurement when 8- and 15-day biofouled membrane filters were used. Four storage methods were designed to test for within-sampler degradation/loss for up to 2 months. Intact samplers can be simply stored in polyethylene bags at ambient temperature (18–26 °C) with most compounds stable (mass loss <20%) for at least 1 week. Keeping intact samplers at 4 °C or binding gels in solvent gave good recoveries, with most chemicals being stable for up to 2 months, although the best results were obtained when binding gels were kept in solvent at 4 °C. Recommendations are made for sample handling and storage of DGT samplers used for determination of trace organics in monitoring and surveillance campaigns.

中文翻译：

使用薄膜技术中的扩散梯度监测水中的有机污染物：研究生物污损和降解的影响。

薄膜（DGT）被动采样技术中的扩散梯度已越来越多地用于提供水中有机污染物生物相关部分的时间加权平均浓度，并且具有低成本的高时空分辨率。该研究针对样品处理/存储过程中生物污垢和化合物降解/损失对一系列新兴有机污染物的DGT测量的影响进行了测试。使用从典型的城市废水处理厂的进水和出水中收集的生物膜对生物污染进行了测试。当使用8天和15天生物污染膜过滤器时，大多数目标化合物（85％）对DGT的测量没有显示可检测的影响。设计了四种存储方法，以测试采样器内最多2个月的降解/损失。完整的采样器可以简单地保存在环境温度（18–26°C）的聚乙烯袋中，大多数化合物稳定（质量损失<20％）至少1周。将完整的采样器保持在4°C或将结合凝胶保持在溶剂中可实现良好的回收率，尽管将结合凝胶保持在4°C的溶剂中可获得最佳结果，但大多数化学品均可稳定保存2个月。针对在监测和监视活动中用于测定痕量有机物的DGT采样器的样品处理和存储提出了建议。尽管将结合凝胶保持在4°C的溶剂中可获得最佳结果。针对在监测和监视活动中用于测定痕量有机物的DGT采样器的样品处理和存储提出了建议。尽管将结合凝胶保持在4°C的溶剂中可获得最佳结果。针对在监测和监视活动中用于测定痕量有机物的DGT采样器的样品处理和存储提出了建议。

更新日期：2020-07-07

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