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解放闸灌域表层土壤中PCBs的残留分布特征
姚雨彤, 裴国霞, 张 琦, 石 峰, 王 晶
内蒙古农业大学
摘要:
选取解放闸灌域为研究区域,于2015年9月采集灌域内49个表层土壤样品,分析7种PCBs单体的残留量及分布特征。结果表明,98% 的土壤样品存在PCBs污染,Σ7PCBs的残留量介于ND ~ 65.04 ng/g,平均残留量10.28 ng/g。各单体间以低氯代联苯为主,PCB47的残留量占主导地位,检出率高达96%。高氯代联苯含量偏低,检出率同样较低为43%。7种PCBs在不同种植作物、土质、灌溉条件下土壤中的残留存在差异。采用克里金法对研究区域Σ7PCBs的空间分布进行探讨,在西南到东北方向上呈现出由低到高的不均匀分布,且浓度向一侧逐渐减小,西南部略低于东北部。
关键词:  表层土壤  PCBs  残留特征  分布特征
DOI:10.13758/j.cnki.tr.2020.01.024
分类号:X53
基金项目:国家自然科学基金项目(51469023)资助。
Residual and Distribution Characteristics of PCBs in Surface Soil of Jiefangzha Irrigation Field
yao yu tong, peiguoxia, zhangqi, shifeng, wangjing
Inner Mongolia Agricultural University
Abstract:
Taking Jiefangzha Irrigation field as research area, 49 surface soil samples were collected in September of 2015 and the residues and distribution characteristics of seven kinds of PCBs were analyzed. The results showed that PCBs were contaminated in 98% of soil samples. The residues of Σ7PCBs ranged from ND to 65.04 ng/g, and the mean residues were 10.28 ng/g. Mainly based on low-chlorinated PCBs contents, the residues of PCB47 play a leading role, and the detection rate was as high as 96%. However, high-chlorinated PCBs residues were low, the detection rate was also lower (43%). There were differences in the residues of 7 PCBs in soils under different crops, soil quality and irrigation conditions. The spatial distribution of PCBs discussed by the Kriging method showed that from the southwest to the northeast, there was an uneven distribution from low to high, the concentration gradually decreased toward one side, and the southwest was slightly lower than the northeast.
Key words:  Surface soil  PCBs  Residual characteristics  Distribution characteristics

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