华东浅层地下水分布区某化工遗留地块土壤地下水污染特征分析
Analysis of Soil and Groundwater Pollution Characteristics at a Legacy Chemical Industrial Plot in the Shallow Groundwater Distribution Area of East China

在产业结构调整与城市布局变化的背景下，化工遗留地块的污染问题备受关注。本研究聚焦华东地区长江三角洲浅层地下水分布区的某化工遗留地块，通过资料收集、现场采样与实验室分析，对其土壤和地下水污染特征展开研究。结果显示，地块土壤中氯苯、1,4-二氯苯等多种污染物超标，其中氯苯最大超标643.44倍，1,2,4-三氯苯最大超标840.38倍，超标严重区域集中于原生产车间。超标污染物在0~22 m深度范围内均有检出，污染且已发生水平和垂直扩散。地下水中氯苯、苯、氯仿存在超标现象，微承压含水层超标情况更严峻。研究表明，地块污染与企业历史生产活动紧密相关，需采取风险管控措施，研究结果为该地块后续修复及类似地块污染治理提供科学依据。
Against the backdrop of industrial structure adjustment and urban layout changes, the pollution issues of chemical legacy plots have drawn significant attention. This study focuses on a chemical legacy plot in the shallow groundwater distribution area of the Yangtze River Delta in East China. Through data collection, field sampling, and laboratory analysis, the pollution characteristics of its soil and groundwater were investigated. The results show that multiple pollutants in the soil of the plot, such as chlorobenzene, 1,4-dichlorobenzene, etc., exceed the standards. Among them, the maximum exceedance multiple of chlorobenzene is 643.44 times, that of 1,2,4-trichlorobenzene is 840.38 times. The severely polluted areas are concentrated in the original production workshops. The pollutants exceeding the standards were detected within the depth range of 0~22 m, and the pollution has occurred in horizontal and vertical diffusion. Chlorobenzene, benzene, and chloroform exceed the standards in the groundwater, and the exceedance situation in the micro-confined aquifer is more severe. The research indicates that the pollution of the plot is closely related to the historical production activities of the enterprise. Risk management and control measures need to be taken. The research results provide a scientific basis for the subsequent remediation of this plot and the pollution treatment of similar plots.