Liu Fang, Wang Shu-Xiao, Wu Qing-Ru, Lin Hai
Civil and Environment Engineering Institute, Beijing University of Science and Technology, Beijing 100083, China
Huan Jing Ke Xue. 2013 Feb;34(2):712-7.
The farming soil and vegetable samples around a large-scale zinc smelter were collected for mercury content analyses, and the single pollution index method with relevant regulations was used to evaluate the pollution status of sampled soils and vegetables. The results indicated that the surface soil and vegetables were polluted with mercury to different extent. Of the soil samples, 78% exceeded the national standard. The mercury concentration in the most severely contaminated area was 29 times higher than the background concentration, reaching the severe pollution degree. The mercury concentration in all vegetable samples exceeded the standard of non-pollution vegetables. Mercury concentration, in the most severely polluted vegetables were 64.5 times of the standard, and averagely the mercury concentration in the vegetable samples was 25.4 times of the standard. For 85% of the vegetable samples, the mercury concentration, of leaves were significantly higher than that of roots, which implies that the mercury in leaves mainly came from the atmosphere. The mercury concentrations in vegetable roots were significantly correlated with that in soils, indicating the mercury in roots was mainly from soil. The mercury emissions from the zinc smelter have obvious impacts on the surrounding soils and vegetables. Key words:zinc smelting; mercury pollution; soil; vegetable; mercury content
采集了某大型锌冶炼厂周边的农田土壤和蔬菜样本进行汞含量分析，并采用单污染指数法结合相关规定对采样土壤和蔬菜的污染状况进行评价。结果表明，表层土壤和蔬菜受到了不同程度的汞污染。在土壤样本中，78%超过了国家标准。污染最严重区域的汞浓度比背景浓度高29倍，达到重度污染程度。所有蔬菜样本中的汞浓度均超过了无公害蔬菜标准。污染最严重的蔬菜中汞浓度是标准值的64.5倍，蔬菜样本中汞浓度平均为标准值的25.4倍。85%的蔬菜样本中，叶片中的汞浓度显著高于根部，这意味着叶片中的汞主要来自大气。蔬菜根部的汞浓度与土壤中的汞浓度显著相关，表明根部的汞主要来自土壤。锌冶炼厂的汞排放对周边土壤和蔬菜有明显影响。关键词：锌冶炼；汞污染；土壤；蔬菜；汞含量
