Diffusive gradients in thin-films (DGT) for in situ measurement of neonicotinoid insecticides (NNIs) in waters

文献类型： 外文期刊

第一作者： Xiong, Junwu

作者： Xiong, Junwu;Yi, Jiapei;Wang, Kang;Zhang, Chi;Chen, Wei;Qi, Shihua;Xiong, Junwu;Yi, Jiapei;Wang, Kang;Zhang, Chi;Chen, Wei;Qi, Shihua;Xiong, Junwu;Pu, Chang;Qian, Zhe;Chen, Wei;Qi, Shihua;Wang, Kang;Chen, Wei;Xu, Li;Liu, Wei;Chen, Wei;Chen, Wei;Chen, Wei;Zhang, Hao;Jones, Kevin C.;Zhang, Zulin

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关键词： Neonicotinoid insecticides (NNIs); Passive sampling; Diffusive gradients in thin-films (DGT); Groundwater; Wastewater

期刊名称：WATER RESEARCH （ 影响因子：12.4； 五年影响因子：12.9 ）

ISSN： 0043-1354

年卷期： 2025 年 269 卷

页码：

收录情况： SCI

摘要： Neonicotinoid insecticides (NNIs) are among the most widely-used insecticides, although their threat to non- target organisms has attracted attention in recent years. In this study, a diffusive gradient in thin-films (DGT) passive sampling technique was developed for in situ monitoring of time-weighted average (TWA) concentrations of NNIs in groundwater and wastewater. Systematic studies demonstrated that DGT with HLB as binding gels (HLB-DGT) is suitable for quantitative sampling of NNIs under a wide range of conditions, independent of pH (5-9.5), ionic strength (0.001-0.5 M) and dissolved organic matter (0-10 mg/L). The HLB-DGT performance was also independent of the typical groundwater ionic environments. The thicknesses of in-situ measured diffusive boundary layer were 0.35 and 0.25 mm in the groundwater and effluent, respectively. HLB-DGT can provide TWA concentrations over 14-18 days' deployment with linear uptake in both groundwater and wastewater. Concentrations and occurrence patterns of NNIs obtained by HLB-DGT were consistent with those measured from grab samples. The median TWA concentration of NNIs was 4.42 ng/L in water from the largest urban lake of China (the Tangxun Lake) in winter, with wastewater discharge being the main potential source. The reliability and stability of the HLB-DGT for measuring NNIs in the groundwater and surface water were confirmed and can be used to improve understanding of the occurrence and fate of NNIs in aquatic environment.

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