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化工污染场地氯苯分布特征
孟宪荣, 许伟, 张建荣
苏州市环境科学研究所
摘要:
以某化工污染场地为研究对象,研究了该场地主要污染物氯苯在土壤中垂直和水平分布特征,分析了生产历史、场地水文地质等因素对氯苯空间分布的影响。结果表明:在重力和淋洗作用下,氯苯能够在黏土层和粉质黏土层中垂直迁移。氯苯在土壤中的垂直分布具有明显的富集特征,主要富集在12.0 ~ 15.6 m深的粉质黏土层中,其中14.4 ~ 15.6 m深的粉质黏土层污染最为严重,氯苯浓度高达1.0×104 mg/kg。在不同采样点位土壤中,氯苯浓度峰值出现的深度不同,在同一采样点位土壤中,氯苯出现多个浓度峰值,这与生产过程中氯苯的分批次、间歇性泄露有关。场地氯苯主要出现在氯苯存储、使用和处置及其附近区域粉质黏土层中,说明氯苯水平分布特征主要受企业生产功能分区影响,同时受场地水文地质的影响产生局部小范围扩散。
关键词:  土壤  污染场地  氯苯  垂直分布  水平分布
DOI:10.13758/j.cnki.tr.2019.06.014
分类号:X53
基金项目:江苏省环保科研课题项目(2016061)和苏州市民生科技计划项目(SS201727)资助。
Distribution Characters of Chlorobenzene in Polluted Chemical Industrial Site
mengxianrong, xuwei, zhangjianrong
Suzhou Environmental Science Research Institute
Abstract:
By taking a chemical pollution site as the research object, this paper analyzed the characteristics of vertical and horizonal distribution of chlorobenzene and the effects of production history and hydrogeology on chlorobenzene’s distribution. The results showed that chlorobenzene could migrate vertically through clay layer and silty clay layer under the action of gravity and drip washing. The distribution of chlorobenzene in soil showed a significant enrichment characteristic that most chlorobenzene was concentrated in 12.0-15.6 m silty clay layer, among them the most seriously polluted layer was 14.4-15.6 m silty clay layer that the largest concentration of chlorobenzene reached to 1.0×104 mg/kg. The highest concentration of chlorobenzene was occurred at different soil depths among the sampling points. Several peak concentrations of chlorobenzene appeared at a sampling point, which was related to batching or intermittent leakage of chlorobenzene in productive process. Chlorobenzene mainly arose in silty clay layer of the chlorobenzene’s storage, use, disposition area and its adjacent silty clay layer, indicating that the horizontal distribution of chlorobenzene was mainly influenced by function division of company, and was also influenced by hydrogeololgy and generated a small range distribution.
Key words:  Soil  Polluted site  Chlorobenzene  Vertical distribution  Horizontal distribution

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