Application of diffusive gradients in thin-films for in-situ monitoring of nitrochlorobenzene compounds in aquatic environments

Zhang, D. and Zhu, Y. and Xie, X. and Han, C. and Zhang, H. and Zhou, L. and Li, M. and Xu, G. and Jiang, L. and Li, A. (2019) Application of diffusive gradients in thin-films for in-situ monitoring of nitrochlorobenzene compounds in aquatic environments. Water Research, 157. pp. 292-300. ISSN 0043-1354

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Abstract

Nitrochlorobenzene compounds (NCBs) are of key interest in environmental monitoring due to their high toxicity. To better understand the presence and fate of NCBs in aquatic environments, an in-situ sampling technique of diffusive gradients in thin films (DGT) based on hydrophilic-lipophilic-balanced (HLB) resin, combined with gas chromatography, was developed to measure four typical NCBs, e.g. meta-chloronitrobenzene (MNCB), para-chloronitrobenzene (PNCB), ortho-chloronitrobenzene (ONCB), and 2,4-dinitrochlorobenzene (CDNB). The diffusion coefficients of MNCB, PNCB, ONCB, and CDNB in agarose-based gel were firstly determined in diffusion cell experiments and ranged from 7.19 × 10 −6 to 7.49 × 10 −6 cm/s. The capacities of HLB-DGT for MNCB, PNCB, ONCB, and CDNB were higher than 114.65, 117.52, 117.72, and 37.58 μg/cm 2 , respectively. The HLB-DGT performance on NCBs determination was demonstrated to be independent of natural fluctuations in pH (3–9), ionic strength (0.001–0.5 M), and dissolved organic matter concentrations (0–20 mg/L) and of deployment time (0–120 h). In the field application, the DGT-based method to measure NCBs not only proved to be accurate and effective, but also performed better than the grab sampling method under the variable conditions. This study demonstrates that the newly developed in-situ method based on DGT can provide an attractive alternative for the routine monitoring of NCBs in aquatic environments.

Item Type:
Journal Article
Journal or Publication Title:
Water Research
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
133187
Deposited By:
Deposited On:
31 Jan 2020 09:55
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Sep 2020 05:28