Zhao Wenchu, Yang Xiao, Feng Aixi, Yan Xiulan, Wang Lingqing, Liang Tao, Liu Juan, Ma Huansong, Zhou Yaoyu
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
J Environ Manage. 2021 Jun 1;287:112342. doi: 10.1016/j.jenvman.2021.112342. Epub 2021 Mar 16.
The production of 2,4,6-trinitrotoluene (TNT) produces a great deal of waste water, and dinitrotoluene sulfonates (DNTs) are the main pollutants in its waste. This paper presents a pilot investigation on the geochemical transformation of DNTs affected by historical wastewater spillage from a typical TNT production company in Northwest China. In the horizontal direction, DNTs diffused from the evaporation pond to the surrounding area of the site, and the concentration of DNTs in the evaporation pond surface soil exceeded 1000 mg/kg. The horizontal distribution of DNTs in the site showed a migration trend to the east and south of evaporation, which was consistent with the terrain of high northwest and low southeast of the site. Due to the high water solubility of pollutants, water flow is the main driving force for the horizontal distribution of DNTs. In the vertical direction, the concentration of pollutants gradually increased with the depth of the soil. DNTs are mainly adsorbed in the third layer (6.0-8.0 m). It can be seen that the accumulation of the 2,4-DNTs-3-SO is obviously larger than that of the 2,4-DNTs-5-SO, which may be related to the steric hindrance effect of sulfonic acid groups in the two isomers. Results showed DNTs distribution strongly linked to soil physicochemical properties and the migration of DNTs in soil exhibited obvious heterogeneity in time and space. The carcinogenic risks in surface soil (0-1.5 m) and lower soil (1.5-6.0 m, 6.0-8.0 m) are all higher than 1✕10; non-carcinogenic risk surface soil (0-1.5 m) is 4.011✕10, which is greater than 1, indicating that they may cause certain harm to the human body. Meanwhile, this study presented a pioneering investigation for the contamination and geochemical transfer of DNTs.
2,4,6-三硝基甲苯（TNT）的生产会产生大量废水，二硝基甲苯磺酸盐（DNTs）是其废水中的主要污染物。本文针对中国西北一家典型TNT生产企业历史废水泄漏影响下DNTs的地球化学转化进行了试点研究。在水平方向上，DNTs从蒸发池扩散至场地周边区域，蒸发池表层土壤中DNTs浓度超过1000mg/kg。场地内DNTs的水平分布呈现向蒸发池东部和南部迁移的趋势，这与场地西北高东南低的地形一致。由于污染物水溶性高，水流是DNTs水平分布的主要驱动力。在垂直方向上，污染物浓度随土壤深度逐渐增加。DNTs主要吸附在第三层（6.0 - 8.0m）。可以看出，2,4-DNTs-3-SO的积累明显大于2,4-DNTs-5-SO，这可能与两种异构体中磺酸基团的空间位阻效应有关。结果表明，DNTs分布与土壤理化性质密切相关，DNTs在土壤中的迁移在时间和空间上表现出明显的非均质性。表层土壤（0 - 1.5m）和下层土壤（1.5 - 6.0m、6.0 - 8.0m）的致癌风险均高于1×10；表层土壤（0 - 1.5m）的非致癌风险为4.011×10，大于1，表明它们可能对人体造成一定危害。同时，本研究为DNTs的污染及地球化学迁移提供了开创性的调查。
