| 某大型砷渣场地土壤As污染特征及生态风险评价 |
| 摘要点击 2188 全文点击 838 投稿时间：2018-04-12 修订日期：2018-06-08 |
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| 中文关键词 大型污染场地 重金属 污染评价 生态风险 分布特征 |
| 英文关键词 large-scale contaminated site heavy metals pollution assessment ecological risk distribution characteristics |
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| 中文摘要 |
| 为精确识别大型污染场地土壤污染特征并评价其生态风险，以我国某大型砷渣场地为研究对象，采集场地土壤样品184个、周边农田土壤样品101个和砷渣样品14个，选择场地中特征污染物As，采用多元统计学、地统计学、地累积指数以及潜在生态风险系数等方法揭示研究区As污染特征和生态风险程度.结果表明，场地土壤、农田土壤及砷渣中As含量的平均值分别为1333.0、358.1和17316.1 mg·kg-1，其污染程度均远高于国家土壤环境质量Ⅲ级标准.污染物垂向分布特征及3维空间分布范围结果显示，As在各土壤剖面深度内均有不同程度的累积，具有一定的空间异质性，场地表层土壤污染较为严重，场地土壤样点中As含量明显高于周边农田土壤.潜在生态危害系数评价结果表明，各土层的潜在生态危害系数平均值均超过了100，场地土壤和周边农田土壤所有样点中等危害程度以上的样点累积比例分别达到58.21%和61.39%，表明该场地及周边农田土壤区域存在着比较严重的生态环境风险. |
| 英文摘要 |
| A large-scale arsenic slag-contaminated site was selected to determine soil pollution characteristics and the degree of ecological risk of a large-scale contaminated site. In this study, 184 site soil samples, 101 agricultural soil samples, and 14 arsenic slag samples were collected and the pollution characteristics and ecological risk of As were evaluated using multivariate statistics, geostatistics, and the geoaccumulation and potential ecological risk index methods. The results show that the average As contents in site soil, agricultural soil, and arsenic slag are 1333.0, 358.1, and 17316.1 mg·kg-1, respectively. The degree of contamination of As exceeds the national standard Ⅲof the environmental soil quality. The results of the vertical and three-dimensional distributions of contamination show that As is accumulated to different extents in different strata. The accumulation in the site surface soil is the most serious. The As concentrations in site soil samples are higher than that in agricultural soil samples. The potential ecological risk index method shows that all mean potential ecological risk indexes exceed 100 in different strata. Moreover, the percentage of samples in site and agricultural soils at medium pollution level ratios is 58.21% and 61.39%, respectively, illustrating that the As pollution of soil samples from this contaminated site and surrounding farm areas is serious. |
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