重点行业场地复合污染土壤联合生态效应及风险评估研究进展
Research Progress on Joint Ecological Effects and Risk Assessment of Composite Polluted Soils in Key Industry Sites
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摘要: 我国已初步形成基于人体健康风险的污染场地土壤风险评估制度和技术标准体系,但基于保护生态受体的土壤污染风险评估技术方法和标准体系尚未构建。本文从我国重点行业场地土壤复合污染现状出发,综述了典型行业场地土壤特征污染物的复合污染生态效应,分析了产生不同联合效应的机理。对目前常用的生态风险评估方法进行了分类阐述,并介绍了复合污染生态风险表征的研究进展。我国冶炼、焦化等重点行业场地通常呈现重金属-重金属复合、重金属-多环芳烃复合等污染特征,当这类污染物共存时,可通过影响彼此的生物吸收转运、降解转化、生物毒性等,从而产生协同、加和、拮抗等联合效应。目前常用的生态风险评估方法包括指数法、商值法、概率法,指数法基于污染源、暴露途径和生物受体的不同指标构建综合评估指数量化污染物的相对风险,商值法基于污染物暴露量和毒性参考值量化污染物的绝对风险,概率法通过污染物和毒性数据的概率密度函数和累积分布概率函数等获得考虑污染分布和毒性效应变异性的绝对风险,复合污染情形下,则可通过浓度加和、效应加和以及两者相结合的多层次方法进行综合表征。Abstract: A human health-based soil risk assessment system and technical standard for contaminated sites has initially formed in our country, while the technical methods and standard system for soil pollution risk assessment based on the protection of ecological receptors have not yet been established. The current situation of soil composite pollution in key industries are firstly introduced, then the ecological effects of composite pollution of characteristics pollutants are summarized, and the mechanism of different combined effects are analyzed. The current commonly used ecological risk assessment methods are classified and expounded, and the research progress of ecological risk characterization of compound pollution is introduced. Pollution characteristics such as heavy metal-heavy metal complex, heavy metal-polycyclic aromatic hydrocarbon complex usually appear in key industries sites such as smelting and coking. When such pollutants coexist, they can form synergistic, additive, antagonistic and other combined effects by affecting each other's biological absorption, transport, degradation, transformation, and finally toxicity. Currently commonly used ecological risk assessment methods include index method, quotient value method, and probability method. The index method constructs a comprehensive assessment index based on different indicators of pollution sources, exposure pathways and biological receptors to quantify the relative risk of pollutants. The quotient method quantifies the absolute risk of pollutants based on pollutant exposure and toxicity reference values. The probability method obtains the absolute risk considering the variability of pollution distribution and toxic effects through the probability density function and cumulative distribution probability function of pollutant and toxicity data. In the case of compound pollution, concentration addition, effect addition, and a combination of the two can be used for comprehensive characterization of risk.
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Key words:
- Key industries /
- soil /
- compound pollution /
- joint ecological effect /
- ecological risk assessment
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