College of resources and environment, Shandong Agricultural University, Tai'an, 271018, China.
College of economics and management, Shandong Agricultural University, Tai'an, 271018, China.
Sci Rep. 2018 Oct 8;8(1):14925. doi: 10.1038/s41598-018-33132-4.
Coal mining areas are prone to hazardous element contamination because of mining activities and the resulting wastes, mainly including Cr, Ni, Cu, Zn, Cd and Pb. This study collected 103 samples of farmland tillage soil surrounding a coal mine in southwestern Shandong province and monitored the heavy metal concentrations of each sample by inductively coupled plasma mass spectrometer (ICP-MS). Statistics, geostatistics, and geographical information systems (GIS) were used to determine the spatial pattern of the potentially toxic metals above in the coal mining area. The results show that the toxic metal concentrations have wide ranges, but the average values for Cr, Ni, Cu, Zn, Cd and Pb are 72.16, 29.53, 23.07, 66.30, 0.14 and 23.71 mg Kg, which mostly exceed the natural soil background contents of Shandong Province. The element pairs Ni-Cu, Ni-Zn, and Cu-Zn have relatively high correlation coefficients (0.805, 0.505, 0.613, respectively). The Kriging interpolation results show that the contents of soil toxic metals are influenced by coal mining activities. Moreover, micro-domain variation analysis revealed the toxic metals in the typical area of the coal transportation line. These findings offer systematic insight into the influence of coal mining activities on toxic metals in farmland tillage soil.
采煤区由于采矿活动和由此产生的废物而容易受到有害元素的污染，主要包括 Cr、Ni、Cu、Zn、Cd 和 Pb。本研究采集了山东省西南部某煤矿周围农田耕作土壤的 103 个样本，并通过电感耦合等离子体质谱仪（ICP-MS）监测了每个样本的重金属浓度。统计、地统计学和地理信息系统（GIS）用于确定采煤区潜在有毒金属的空间分布模式。结果表明，有毒金属浓度范围较广，但 Cr、Ni、Cu、Zn、Cd 和 Pb 的平均值分别为 72.16、29.53、23.07、66.30、0.14 和 23.71mg Kg，这些元素的平均值大多超过了山东省自然土壤背景值。元素对 Ni-Cu、Ni-Zn 和 Cu-Zn 具有较高的相关系数（分别为 0.805、0.505 和 0.613）。克里金插值结果表明，土壤有毒金属的含量受采煤活动的影响。此外，微观域变分析揭示了煤炭运输线路典型区域的有毒金属情况。这些发现为系统地了解采煤活动对农田耕作土壤中有毒金属的影响提供了依据。
