摘要
土壤中挥发性有机物(VOCs)采样时预加甲醇会使得方法检出限提高,可能导致含量超标的VOCs未检出,进而影响地块污染风险的判定。首先通过分析得出添加甲醇后方法检出限的提高范围,其次假设土壤中常见的62种VOCs含量等于建设用地土壤污染风险筛选值(或风险控制值),比较提高后的检出限和筛选值(或风险控制值)大小,对地块污染风险判定影响划分等级,并提出相应采样建议。结果显示,在第1类建设用地方式下,采样预加甲醇对地块污染风险判定影响较高的污染物有1,2,3-三氯丙烷和1,2-二溴乙烷,影响中等的污染物有氯乙烯、一溴二氯甲烷、氯仿、1,1-二氯丙烯、二溴-3-氯丙烷、1,2-二氯乙烷、溴甲烷、1,1,2-三氯乙烷、苯、三氯乙烯、四氯化碳、1,2-二氯丙烷,其余污染物影响较低。在第2类建设用地方式下,采样预加甲醇对地块污染风险判定影响中等的污染物有氯仿、1,2,3-三氯丙烷、1,2-二溴乙烷和氯乙烯,其余污染物影响均较低。
The limit of detection(LOD)was increased by preserving with methanol when collecting soil volatile organic compounds(VOCs),which may result in undetecting of higher levels of VOCs.Thus,it exerts the influence on the determination of site pollution risk.Firstly,the improvement range of LOD after soil VOCs sampling preserved with methanol was calculated.Secondly,it is assumed that the contents of 62 VOCs commonly in soil were equal to the screening value(or risk control value)of soil contamination of construction land.Thirdly,the comparisons between the improved LODs and screening values(or risk control values)of these VOCs were made to analyze the risk levels of contaminated site.According to the analysis,the corresponding sampling suggestions were put forward.The results show that 1,2,3-trichloropropane,1,2-Dibromoethane and chloroethylene were the most affected pollutants in the first type of construction land use,followed by vinyl chloride,bromodichloromethane,trichloromethane,1,1-dichloropropene,1,2-dibromo-3-chloropropane,1,2-dichloroethane,methyl bromide,1,1,2-trichloroethane,benzene,trichloroethylene,carbon tetrachloride,1,2-dichloropropane,while other pollutants had little effect.Nevertheless,trichloromethane,1,2,3-trichloropropane,1,2-dibromoethane and vinyl chloride were the moderately affected pollutants in the second type of construction land use,while other pollutants had been little affected.
作者
李群
龙涛
周艳
范婷婷
左斐然
吴运金
LI Qun;LONG Tao;ZHOU Yan;FAN Ting-ting;ZUO Fei-ran;WU Yun-jin(State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control/Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing 210042,China;Chang Jiang Nanjing Waterway Bureau,Nanjing 210011,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2021年第2期242-248,共7页
Journal of Ecology and Rural Environment
基金
国家重点研发计划(218YFC1803100,2019YFC1804000)。
关键词
土壤污染风险筛选值
土壤污染风险控制值
挥发性有机物(VOCs)
甲醇
地块污染风险判定
risk screening values for soil contamination
risk control values for soil contamination
volatile organic compounds
methanol
determination of site pollution risk
