土壤有机质影响多氯联苯土壤残留变化特征

来源期刊:中南大学学报(自然科学版)2013年第11期

论文作者:崔嵩 刘丽艳 李一凡

文章页码:4759 - 4768

关键词:多氯联苯;土壤有机质;垂直迁移;残留特征

Key words:polychlorinated biphenyls; organic matter; vertical distribution; residue characteristic

摘    要:为了了解土壤有机质对有机污染物土壤残留特征的影响,选取典型持久性有机污染物多氯联苯(PCBs)作为模拟研究对象,应用中国网格化工业污染物排放残留模型,通过改变土壤有机碳质量分数来进行数值模拟,并观测单一源排放对多氯联苯同系物土壤残留特征的影响。研究结果表明:在土壤结构和环境参数相同的状况下,溶解度、蒸汽压及土壤/沉积物-水分配系数等有机污染物自身的理化性质对多氯联苯在土壤中的垂直迁移行为产生影响,模拟物质CB28,CB101,CB153及CB180的渗滤势(LP)分别为:2.47×10-4,3.10×10-6,4.40×10-7,1.65×10-7;在有机碳质量分数不同的情况下,将模拟期末第1层土壤(深度0.1 cm)中PCBs质量分数与土壤有机碳质量分数进行相关分析,所模拟物质均与有机碳质量分数呈显著正相关,第2层土壤(深度1 cm)中PCBs质量分数与土壤有机碳质量分数进行相关分析,所模拟物质质量分数均与有机碳质量分数呈显著正相关(除CB180),而第3层土壤(深度20 cm)中PCBs质量分数与有机碳质量分数均呈负相关;土壤有机质质量分数的变化对多氯联苯同系物的土壤环境行为有重要的影响。

Abstract: In order to investigate the influence of soil organic matters on residue characteristic of POPs in soil, one of POPs-polychlorinated biphenyls (PCBs) was selected as a target chemical. Chinese Gridded Industrial Pollutant Emission and Residue Model (ChnGIPERM) was developed to simulate the residue characteristic based on changing of soil organic matters by using a single pollutant source. The results show that, in the same cases of soil structure and environmental parameters, solubility, vapor and soil/sediment-water partition coefficient affect the vertical migration of PCBs in soil. The leaching potentials (LP) of CB28, CB101, CB153 and CB180 are 2.47×10-4, 3.10×10-6, 4.40×10-7, 1.65×10-7, respectively. There is a significant positive correlation between organic matter and the residue amount for all modeled PCB congeners at the first soil layer (depth of 0.1 cm), and for all modeled PCB congeners (except CB180) at the second soil layer (depth of 1 cm), but a negative correlation for all modeled PCB congeners at the third soil layer (depth of 20 cm), indicating that organic matter has an important influence on environmental behavior of polychlorinated biphenyls in soil.

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