为了有效解决被卤代烃污染的场所的气味控制问题,必须建立气味风险预测系统,以评估可能影响未来规划的潜在风险。这项研究的重点是一个代表性的卤代烃污染的网站,研究了土壤气体中关键污染物的时空分布特征。通过分析气味贡献率,这项研究确定了土壤气体中的显著气味,它可以根据嗅觉效应推导土壤和地下水的概率和确定性安全阈值。研究结果表明,1,1-二氯乙烯,氯乙烯,氯仿,1,1-二氯乙烷在整个受污染的地方很普遍,显示升高的浓度水平和显著影响整体污染程度。这些物质被强调为需要注意的关键污染物。相关性分析(P<0.05)揭示了氯乙烯浓度之间的强关系,1,1-二氯乙烷,和氯仿与地下水深度和空气温度。此外,气味活性值(OAV)的分析确定了1,1-二氯乙烯,1,4-二氯苯,氯苯,氯仿,和氯乙烯作为现场的关键嗅觉因素。土壤相应的概率安全阈值为0.68、1.65、0.50、7.87和3.72mg·kg-1,地下水为9.29、3.46和1.09、69.55和47.01mg·L-1,分别。其中,氯苯和1,1-二氯乙烯的气味风险比土壤污染风险更值得关注;关于1,4-二氯苯,建议在人体健康风险评估中同时考虑气味风险;至于氯乙烯和氯仿,基于面向人类健康的污染管理,它们的气味风险可以在很大程度上被消除。
To effectively address odor control issues at sites contaminated with halogenated hydrocarbons, it is essential to establish an odor risk prediction system for evaluating potential risks that may impact future planning. This research focuses on a representative halogenated hydrocarbon-contaminated site, examining the spatial and temporal distribution characteristics of key pollutants in soil gas. By analyzing odor contribution rates, the study identifies significant odorants in soil gas, which enables the derivation of both probabilistic and deterministic safety
thresholds for soil and groundwater based on olfactory effects. The findings indicate that 1,1-dichloroethylene, vinyl chloride, chloroform, and 1,1-dichloroethane are prevalent throughout the contaminated site, displaying elevated concentration levels and substantially influencing the overall contamination extent. These substances are highlighted as critical pollutants requiring attention. Correlation analysis (P < 0.05) reveals a strong relationship between the concentrations of vinyl chloride, 1,1-dichloroethane, and chloroform with groundwater depth and air temperature. Additionally, the analysis of odor activity values (OAV) identified 1,1-dichloroethene, 1,4-dichlorobenzene, chlorobenzene, chloroform, and vinyl chloride as key olfactory factors at the site. The corresponding probabilistic safety
thresholds are 0.68, 1.65, 0.50, 7.87, and 3.72 mg kg-1 for soil, and 9.29, 3.46, and 1.09, 69.55, and 47.01 mg L-1 for groundwater, respectively. Among them, the odor risks of chlorobenzene and 1,1-dichloroethylene warrant more attention than soil contamination risks; regarding 1,4-dichlorobenzene, it is recommended to concurrently consider odor risks during human health risk assessment; as for vinyl chloride and chloroform, their odor risks can be largely eliminated based on human health-oriented pollution management.