| 湘黔汞矿区土壤汞的化学形态及污染特征 |
| 摘要点击 1537 全文点击 913 投稿时间：2006-03-23 修订日期：2006-05-08 |
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| 中文关键词 汞 形态 BCR法 土壤 湘黔区域 |
| 英文关键词 mercury speciation BCR extraction procedures soil Western Hunan-Eastern Guizhou Province |
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| 中文摘要 |
| 以湘黔汞矿带内典型矿区土壤为对象，基于BCR三步法和氢化发生-等离子体发射光谱技术，研究了湘黔汞矿区土壤中汞的形态含量及污染特征.结果表明，矿区土壤中汞以残渣态为主，其次为有机-硫化态，酸交换态和铁锰氧化态所占比例较少，各形态汞的分配系数依次为：残渣态(85.77%)>>有机-硫化态(12.44%)>>Fe-Mn氧化态(0.93%)≈酸交换态(0.86%)；土壤中各形态汞含量与砂粒含量正相关，与粘粒含量负相关，并随土壤pH升高而增加；各形态汞含量存在明显的空间分异，垂直空间上体现为表层土壤中的含量高于亚表层土壤，水平空间上表现为随着与污染源距离的增加而含量急剧降低，并因土地利用类型不同、区域不同而差异明显.人类活动引起的外源输入性汞污染对矿区土壤中汞的环境毒性和污染特征产生了重大影响. |
| 英文摘要 |
| 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. |
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