Soil Heavy Metal Pollution Around the Dabaoshan Mine,Guangdong Province,China

在 Dabaoshan 矿的附近的土壤污染，广东省，中国，通过全部的集中的决心和有毒的金属， Cu， Zn， Cd，和 Pb 的化学种形成被学习，用诱导地联合的血浆质谱法。结果证明在过去的十年，公害被 Cu， Zn， Cd，和 Pb 的联合引起，与跟踪和是的酸矿排水影响土壤的主要污染来源。显著地高级(P ≤ 0.05 ) 作为与稻，花园，和控制土壤相比在跟踪 Cu， Zn， Cd，和 Pb 被发现，与一般水准 1 486， 2 516， 6.42，和 429 mg kg ? 1 分别地。这些金属连续地从跟踪和废水下游地被驱散，并且因此他们在水稻土的集中象 567 一样高， 1 140 ， 2.48 ，和 191 mg kg ? 1 ，分别地显著地更高( P ≤ 0.05 )作为与那些相比在花园土壤。从所有土壤类形的上述金属的顺序的抽取的结果证明剩余部分是主导的形式。然而， Fe-Mn 氧化物和有机物一定的金属的数量比那些跳到在可交换的形式存在的碳酸盐或那些相对高。当金属能从一个惰性的状态被转变到一个活跃状态，潜在的环境风险将与时间由于这些金属增加。

Soil contamination in the vicinity of the Dabaoshan Mine, Guangdong Province, China, was studied through determi- nation of total concentrations and chemical speciation of the toxic metals, Cu, Zn, Cd, and Pb, using inductively coupled plasma mass spectrometry. The results showed that over the past decades, the environmental pollution was caused by a combination of Cu, Zn, Cd, and Pb, with tailings and acid mine drainage being the main pollution sources affecting soils. Significantly higher levels （P ≤ 0.05） of Cu, Zn, Cd, and Pb were found in the tailings as compared with paddy, garden, and control soils, with averages of 1486, 2516, 6.42, and 429 mg kg^-1, respectively. These metals were continuously dispersed downstream from the tallings and waste waters, and therefore their concentrations in the paddy soils were as high as 567, 1 140, 2.48, and 191 mg kg^-1, respectively, being significantly higher （P ≤ 0.05） as compared with those in the garden soils. The results of sequential extraction of the above metals from all the soil types showed that the residual fraction was the dominant form. However, the amounts of metals that were bound to Fe-Mn oxides and organic matter were relatively higher than those bound to carbonates or those that existed in exchangeable forms. As metals could be transformed from an inert state to an active state, the potential environmental risk due to these metals would increase with time.