Development and application of diffusive gradients in thin-films for in situ sampling of the bitterest chemical-denatonium benzoate in waters

JOURNAL OF HAZARDOUS MATERIALS

卷:418

Article

Liu, Sisi^1,2  Chen, Shibao^1,2  Li, Xiaohao^1,2  Yue, Yubo^1,2  Li, Jinling^1,2  Williams, Paul N.³  Wang, Zhanyun⁴  Li, Cailin^1,2  Yang, Yuanyuan^1,2  Ying, Guang-Guo^1,2  Chen, Chang-Er^1,2 

[1] South China Normal Univ, Environm Res Inst, Sch Environm, Guangdong Prov Key Lab Chem Pollut & Environm Saf, Guangzhou 510006, Peoples R China

[2] South China Normal Univ, MOE Key Lab Theoret Chem Environm, Guangzhou 510006, Peoples R China

[3] Queens Univ Belfast, Inst Global Food Secur, 19 Chlorine Gardens, Belfast BT9 5DL, Antrim, North Ireland

[4] Swiss Fed Inst Technol, Inst Environm Engn, CH-8093 Zurich, Switzerland

关键词: Denatonium benzoate;    Diffusive gradients in thin-films (DGT);    Mixed-mode cation exchange (MCX);    Passive sampling;    Aquatic environment;   

DOI  :  10.1016/j.jhazmat.2021.126393

来源: Elsevier

【 摘 要 】

Denatonium benzoate (DB), a commonly used bitter agent in numerous products, has recently been recognized as a waterborne contaminant due to concern about its potential persistence, mobility and toxicity (PMT). However, its occurrence, levels and fate in global aquatic environments are largely unknown. In this study, a new sampling method, based on diffusive gradients in thin films (DGT) with mixed-mode cation exchange (MCX) as the binding agent, was developed for measuring DB in waters. MCX shows a rapid adsorption and high capacity for DB. DB is linearly accumulated by MCX-DGT. pH (6-8), ionic strength (0.01-0.5 M), or DOM (0-10 M) do not show any significant effect on the MCX-DGT performance, confirming its reliability. The DGT measurements in a wastewater treatment plant (WWTP) are comparable to those by paralleled grab sampling. The field results suggest DB is persistent in WWTPs and could be a potential domestic wastewater indicator. Therefore, MCX-DGT is a promising technique for understanding the environmental occurrence, levels and fate of DB. This is a first report of using DGT for DB monitoring and of DB occurrence in Chinese environments. Further exploration of DGT as a reliable passive monitoring tool for a wide range of PMT substances in different applications is warranted.

【 授权许可】

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