摘要
为探究挥发因子模型在土壤污染风险评估、土壤样品采集和污染场地风险管控中的应用,首先回顾了挥发因子模型的推导过程、识别了挥发因子的主要影响参数;在此基础上讨论土壤采样过程中挥发因子、土壤暴露时间、挥发损失量三者的相互关系,推导风险管控中所需覆土厚度的计算公式;最后以实际污染物进行验算。研究结果显示,污染物有效扩散系数对挥发因子有较大的影响;挥发性和半挥发性污染物有效扩散系数分布范围有重叠,参考剂量分配比例的选择仅考虑沸点和饱和蒸汽压可能会低估风险;土壤采样过程中污染物的扩散损失量、有机污染物风险管控过程中所需覆土厚度均与挥发因子呈正相关。因此,在土壤污染调查、风险评估及污染场地风险管控等工作中,参考剂量分配比例选择、土壤取样时间和取样直径、风险管控所需覆土厚度等参数的计算和确定,需要充分考虑挥发因子的影响。
In order to explore the application of soil pollutant volatile factor model in soil sampling,site risk assessment and risk control of the soil contamination,the derivation of volatile factor model was reviewed and the main influencing parameters of the volatilization factor model were identified. On this basis,the relationship among volatile factor,soil exposure time and volatilization loss in the process of soil sampling was discussed,and the equation was derived to calculate the thickness of covering soil in risk management and control. Finally,the actual pollutants were used to verify the equation. The results showed that the effective diffusion coefficient of pollutants has a great influence on the volatile factor. The distribution range of effective diffusion coefficient of volatile and semi-volatile pollutants overlaps. When selecting the reference dose distribution proportion,the risk might be underestimated if only considering boiling point and saturated vapor. The diffusion loss of pollutants in soil sampling process and the thickness of soil covering required in the process of risk control of organic pollutants were positively correlated with the volatile factor. Therefore,it is necessary to fully take account of the effect of the volatile factor when determining the reference dose distribution proportion,the sampling time and diameter,and the soil thickness for risk control.
作者
吴鹏
马露瑶
孙哲
WU Peng;MA Lu-yao;SUN Zhe(Jiangsu Rainfine ErwironmeTital Science&Technology Co.,Ltd.,Nanjing 210000,China;Jiangsu Provincial Environmental Engineering Technology Co.Ltd.Nanjing 210000,China)
出处
《四川环境》
2022年第3期228-233,共6页
Sichuan Environment
