当前位置: X-MOL 学术Environ. Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
DGT Passive Sampling for Quantitative in Situ Measurements of Compounds from Household and Personal Care Products in Waters
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-11-11 00:00:00 , DOI: 10.1021/acs.est.7b03940
Wei Chen 1 , Yanying Li 1 , Chang-Er Chen 1 , Andrew J. Sweetman 1 , Hao Zhang 1 , Kevin C. Jones 1
Affiliation  

Widespread use of organic chemicals in household and personal care products (HPCPs) and their discharge into aquatic systems means reliable, robust techniques to monitor environmental concentrations are needed. The passive sampling approach of diffusive gradients in thin-films (DGT) is developed here and demonstrated to provide in situ quantitative and time-weighted average (TWA) measurement of these chemicals in waters. The novel technique is developed for HPCPs, including preservatives, antioxidants and disinfectants, by evaluating the performance of different binding agents. Ultrasonic extraction of binding gels in acetonitrile gave good and consistent recoveries for all test chemicals. Uptake by DGT with HLB (hydrophilic–lipophilic-balanced) as the binding agent was relatively independent of pH (3.5–9.5), ionic strength (0.001–0.1 M) and dissolved organic matter (0–20 mg L–1), making it suitable for applications across a wide range of environments. Deployment time and diffusion layer thickness dependence experiments confirmed DGT accumulated chemicals masses are consistent with theoretical predictions. The technique was further tested and applied in the influent and effluent of a wastewater treatment plant. Results were compared with conventional grab-sampling and 24-h-composited samples from autosamplers. DGT provided TWA concentrations over up to 18 days deployment, with minimal effects from biofouling or the diffusive boundary layer. The field application demonstrated advantages of the DGT technique: it gives in situ analyte preconcentration in a simple matrix, with more quantitative measurement of the HPCP analytes.

中文翻译:

DGT被动采样用于水域中家用和个人护理产品中化合物的定量原位测量

有机化学物质在家庭和个人护理产品(HPCP)中的广泛使用以及将其排放到水生系统中意味着需要可靠,强大的技术来监测环境浓度。此处开发了薄膜扩散梯度(DGT)的被动采样方法,并证明了该方法可以对水中的这些化学物质进行就地定量和时间加权平均值(TWA)测量。通过评估不同结合剂的性能,开发了适用于HPCP的新技术,包括防腐剂,抗氧化剂和消毒剂。超声提取乙腈中的结合凝胶可对所有测试化学品进行良好且一致的回收率。DGT以HLB(亲水-亲脂平衡)作为结合剂的吸收相对独立于pH(3.5-9.5),离子强度(0.001-0)。–1),使其适用于广泛的环境中的应用程序。展开时间和扩散层厚度依赖性实验证实DGT累积的化学物质质量与理论预测一致。对该技术进行了进一步测试,并将其应用于废水处理厂的进水和出水。将结果与传统的自动取样和自动进样器的24小时合成样品进行了比较。DGT在长达18天的部署中提供了TWA浓度,而生物污垢或扩散边界层的影响最小。现场应用证明了DGT技术的优势:它可以在简单的基质中进行原位分析物预富集,并且可以对HPCP分析物进行更定量的测量。
更新日期:2017-11-13
down
wechat
bug