云南某化工厂厂区土壤重金属分布特征分析

Distribution of Heavy Metals in an Abandonedchemical Factory of Yunnan Province

对云南省某废弃化工厂原渣场、生产区和生活区土壤中的重金属污染情况进行了调查。结果表明:(1)从渣场到生活区,土壤砷、六价铬含量逐渐增加;生产区的总铬含量最高;(2)随土层厚度增加,总铬含量降低,但砷含量和生活区的六价铬含量呈增加趋势;(3)土壤砷、总铬、六价铬含量的空间分布与土壤水分条件和土壤粒径显著相关;(4)土壤有机质含量与土壤砷含量显著相关。本研究表明,土壤物理性质是影响土壤重金属分布的重要因素,同时需要考虑重金属生产的工厂功能区布局对重金属潜在分布格局造成的影响。

Absrtact:The investigation was conducted on heavy metal pollutionin three areasincluding residue piling yard,living area and production area of an abandoned chemical plant in Yunnan Province.Results show that:(1)The concentration of arsenic and chromium(VI)in soil increased graduallyfrom the slag field to the living area,the highest concentration of total chromiumin soil was detected in production area;(2)With the increase of the thickness of soil layer,the concentration of total chromium decreased,buttheconcentration of arsenic and chromium(VI)in living area showed a different trend;(3)Spatial distribution of arsenic,choromium and chromium(VI)in soil were significantly related to the water content and particle size;(4)Significant correlation w existed between soil organic content and arsenic content.The research indicates that,soil physical property was an important factor affecting the distribution of heavy metals in soil.Besides,the effect ofthe functional arrangement of the heavy metal producing factories on heavy metal potential distribution need to be considered.