Li Yong-Hua, Yang Lin-Sheng, Li Hai-Rong, Wang Wu-Yi, Tang Deng-Yin
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Huan Jing Ke Xue. 2007 Mar;28(3):654-8.
By the BCR extraction procedures and HG-ICP-AES technique, the chemical speciation and pollution characteristics of soil mercury in typical mercury deposit areas of Western Hunan-Eastern Guizhou province were studied. It was found that the concentrations of mercury in soils are dominated by residual form, followed by organic-sulfide form. Fe-Mn oxides and acid-exchangeable form are rather low. The percent of the four mercury species in soils are 85.77%, 12.44%, 0.93% and 0:86%, respectively. The total concentrations and each species of mercury in soils show positive relationship with the concentration of sands, and negative relationship with the concentration of clays in soils. They also increase with the soil pH value. Mercury concentration in soils has spatial changes. In general, the concentrations in the surface soil are higher than those of sub-surface soils. Furthermore, the concentrations rapidly decrease with the distance from the pollution source increased and vary among different soil samples from different location and land use type. The results indicated that exogenous mercury pollution caused by human activities provides significant influence on environmental toxicity and pollution characteristics of mercury in soils of mercury deposit area.
通过BCR萃取程序和HG-ICP-AES技术，对湘西—黔东典型汞矿区土壤汞的化学形态及污染特征进行了研究。结果表明，土壤中汞的含量以残渣态为主，其次是有机硫化物态，铁锰氧化物态和酸可交换态含量较低。土壤中四种汞形态的占比分别为85.77%、12.44%、0.93%和0.86%。土壤中汞的总含量及各形态含量与砂含量呈正相关，与黏粒含量呈负相关，且随土壤pH值升高而增加。土壤汞含量存在空间变化，总体上表层土壤汞含量高于下层土壤。此外，汞含量随距污染源距离增加而迅速降低，且不同地点和土地利用类型的土壤样品汞含量存在差异。结果表明，人类活动造成的外源汞污染对汞矿区土壤汞的环境毒性和污染特征有显著影响。
