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/cm², 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.

硝基氯苯化合物（NCB）具有高毒性，因此在环境监测中非常重要。为了更好地了解NCB在水生环境中的存在和命运，开发了一种基于亲水-亲脂平衡（HLB）树脂的薄膜（DGT）中扩散梯度的原位采样技术，并结合气相色谱法来测量四种典型的NCB，例如间氯硝基苯（MNCB），对氯硝基苯（PNCB），邻氯硝基苯（ONCB）和2,4-二硝基氯苯（CDNB）。MNCB，PNCB，ONCB和CDNB在琼脂糖凝胶中的扩散系数首先在扩散池实验中确定，范围为7.19×10 ^-6至7.49×10 ^-6 厘米/秒 HLB-DGT的MNCB，PNCB，ONCB和CDNB的容量分别高于114.65、117.52、117.72和37.58μg/ cm ²。已证明HLB-DGT对NCBs的测定性能与pH（3–9），离子强度（0.001–0.5 M）和溶解的有机物浓度（0–20 mg / L）的自然波动以及部署时间无关。 （0-120小时）。在现场应用中，基于DGT的NCB测量方法不仅被证明是准确和有效的，而且在可变条件下的性能也比抓样方法好。这项研究表明，基于DGT的新开发的原位方法可以为水生环境中NCB的常规监测提供有吸引力的替代方法。