| 典型危废焚烧处置场地土壤重金属分布特征、来源解析及风险评价 |
| 摘要点击 1181 全文点击 193 投稿时间：2024-02-02 修订日期：2024-04-30 |
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| 中文关键词 危废焚烧处置场地 重金属 污染特征 绝对因子得分-多元线性回归源解析模型（APCS-MLR） 潜在生态风险 |
| 英文关键词 hazardous waste incineration disposal site heavy metal pollution characteristics absolute factor analysis-multiple linear regression （APCS-MLR） potential ecological risk |
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| 中文摘要 |
| 为探讨典型危废焚烧处置场地土壤重金属分布特征和生态风险状况,基于上海市5块典型危废焚烧处置场地85个不同深度土壤样本数据,采用地累积指数法、内梅罗综合污染指数法和潜在生态风险指数法评价6种重金属Hg、Cd、As、Pb、Ni和Cu的潜在风险,并运用绝对因子得分-多元线性回归（APCS-MLR）源解析模型分析重金属来源. 结果表明：①研究区域土壤中6种重金属均存在不同程度的累积,除As外,其余重金属在表层土壤含量均超过背景值,污染程度随土壤深度增加而降低；Cu和Cd的中等累积的点位占比较高,表层土壤中有部分重度污染点位,存在局部风险过高的情况. ②APCS-MLR源解析模型结果表明,研究区域土壤中重金属 Cu、Pb和Cd主要反映了堆存和运输过程产生的影响,重金属As主要受自然地质背景影响,重金属Hg主要受危废焚烧产生的影响,重金属Ni主要来自多种途径的混合源. ③地累积指数结果表明,研究区域内6种重金属在不同垂向深度均未呈现污染现象；内梅罗综合污染指数结果显示,研究区域内表层土壤样品存在5.88%的点位处于中度污染,2.94%的点位处于重度污染,其余点位均处于轻度污染水平；潜在生态风险指数结果显示研究区域整体处于轻度污染水平,部分点位风险较高,可能存在集中区域局部污染严重的情况,主要潜在风险因子为Hg和Cd,需加强关注. |
| 英文摘要 |
| To explore the heavy metal pollution characteristics and ecological risk status of soil in typical hazardous waste incineration disposal sites, data was collected from 85 different depth profiles of soil samples taken from five typical hazardous waste incineration disposal sites in Shanghai. The pollution level and potential risk of six heavy metals （Hg, Cd, As, Pb, Ni, and Cu） were evaluated using the geo-accumulation index, the Nemerow comprehensive pollution index, and the potential ecological risk index, and the APCS-MLR receptor model used to analyze the pollution sources. The results showed that： ① Varying degrees of accumulation of the six heavy metals exist in the soil of the study area. Except for As, the content of other heavy metals in the surface soil exceeded the background value, and the degree of pollution decreased with increasing soil depth. The proportion of moderately accumulated sites for Cu and Cd was relatively high, and there were certain heavily polluted sites in the surface soil, which posed a high local risk. ② The results of the APCS-MLR receptor model indicated that source 1 （Cu, Pb, and Cd） was mainly affected by stockpiling and transportation, source 2 （As） was mainly affected by natural geological background, source 3 （Hg） was mainly affected by the hazardous waste incineration process, and the other source （Ni） was mainly affected by mixed sources in multiple ways. ③ The geo-accumulation index indicated that there was no pollution of the six heavy metals at different vertical depths in the study area. The Nemerow comprehensive pollution index showed that 5.88% of the surface soil samples in the study area were moderately polluted, 2.94% were severely polluted, and the remaining points were at a mild pollution level. The potential ecological risk index showed that the entire study area was at a mild pollution level, with some locations presenting strong risks. Severe local pollution may exist in concentrated areas, and the main potential risk factors were Hg and Cd. |
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