PDF(Pubmed)
Abstract：
The coal gangue dump may introduce heavy metal(oid)s (HMs) into surrounding agricultural soils, posing potential health risks to nearby communities. This study evaluated heavy metal(oid) pollution in agricultural soils adjacent to a gangue dump at an abandoned coal mine in Chongqing, Southwest China. The concentrations of HMs (As, Cd, Cr, Cu, Ni, Pb, and Zn) were quantified using ICP-MS, and the contamination status was assessed using the Geoaccumulation Index (Igeo), Contamination Factor (CF), Pollution Load Index (PLI), and Potential Ecological Risk Index (RI). Heavy metal(oid) contamination was detected in soils across a depth of 0-30 cm, particularly pronounced in the topsoil layer (0-10 cm and 10-20 cm depths). Cu emerged as the predominant contaminant across all examined depths, with average Igeo values of 1.20, 1.21, and 1.16 for the 0-10 cm, 10-20 cm, and 20-30 cm depths, respectively, indicating moderate contamination. The CF for Cu was 3.55, 3.55, and 3.50 for these respective depths, classifying it as considerable contamination. The PLI values ranged from 1.61 to 2.50, with a mean value of 2.12, indicating overall contamination. The ecological risk assessment indicated that the soil\'s ecological risk was low at all depths. Cd was the major contributor to the RI, accounting for 48%, 47%, and 42% at 0-10 cm, 10-20 cm, and 20-30 cm depths, respectively. Health risk assessments revealed significant non-carcinogenic risks to children (mean HI = 1.30) and unacceptable carcinogenic risks to both adults and children (mean TCR = 3.26 × 10-4 and 1.53 × 10-3, respectively). This study underscores the critical need for comprehensive risk assessments using multiple indicators to prioritize remediation efforts for HMs, providing a scientific basis for effective environmental management and public health protection in the Three Gorges Reservoir Area.
摘要：
煤矸石堆场可能会将重金属（oid）（HM）引入周围的农业土壤中，对附近社区构成潜在的健康风险。这项研究评估了重庆一个废弃煤矿的煤矸石堆附近的农业土壤中的重金属（oid）污染，中国西南地区。HMs的浓度(As，Cd,Cr,Cu,Ni,Pb,和Zn)使用ICP-MS定量，污染状况采用地质累积指数(Igeo)评估，污染因子（CF），污染负荷指数(PLI)和潜在生态风险指数(RI)。在0-30厘米深度的土壤中检测到重金属（oid）污染，在表土层（0-10厘米和10-20厘米深度）中特别明显。在所有检查的深度中，铜作为主要污染物出现，0-10厘米的平均Igeo值为1.20、1.21和1.16，10-20厘米，和20-30厘米的深度，分别,表明中度污染。对于这些深度，Cu的CF分别为3.55、3.55和3.50，将其归类为相当大的污染。PLI值范围为1.61至2.50,平均值为2.12,表明总体污染。生态风险评价表明,各深度土壤生态风险较低。Cd是RI的主要贡献者，占48%，47%,和42%在0-10厘米，10-20厘米，和20-30厘米的深度，分别。健康风险评估显示，儿童具有明显的非致癌风险（平均HI=1.30），成人和儿童具有不可接受的致癌风险（分别为平均TCR=3.26×10-4和1.53×10-3）。这项研究强调了使用多个指标进行全面风险评估的关键需求，以确定HMs的补救工作的优先级。为三峡库区有效的环境管理和公共卫生保护提供科学依据。
