江西农业大学学报Issue(4)：743-748,6.DOI:10.13836/j.jjau.2015113
贵州典型土壤中 Cd形态分布及环境风险评价
Cd Speciation Distribution and Environmental Risk Assessment for Typical Cd Polluted Soil in Guizhou Province
摘要
Abstract
The speciation distribution of heavy metals is closely linked to their biological toxicities and ec-ological effects.A pot experiment was conducted to study the characteristics of speciation distribution of Cd, which was added to typical soils in Guizhou Province with different concentrations,and the environmental risk of Cd was assessed.The results were as follows.①Under natural conditions,the proportions of residual Cd were more than 80%in yellow soil and calcareous soil,but the proportions of non-stable state Cd were very low,that is to say,the sum proportions of acid soluble Cd,reducible Cd and oxidizable Cd were less than 20%.②In the soils simulated with different degrees of Cd pollution,the proportions of acid soluble and reducible Cd were ap-parently higher than those in natural soils.Especially,when the external Cd concentrations were 2.5 mg/kg and 5 mg/kg,their ratios outnumbered 65%.Moreover,the acid soluble Cd share of yellow soil was greater than that of calcareous soil.③Based on the risk assessment code,the environmental risks of Cd were low in unpolluted soils.However,it was dangerous for environment that the risks of Cd exceeded moderate hazard in contaminated soils.As Cd contamination degrees mounted up,the risks became higher.Overall,the environmental risk of Cd in contaminated yellow soil was higher than that in polluted calcareous soil.The results of the study provides a scientific basis for the soil pollution risk management in Guizhou Province.关键词
贵州/土壤/Cd/形态分布/风险评估编码Key words
Guizhou/soil/Cd/speciation distribution/risk assessment code ( RAC)分类
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..贵州典型土壤中 Cd形态分布及环境风险评价[J].江西农业大学学报,2015,(4):743-748,6.基金项目
贵州省农科院研究生科研创新基金项目（黔农科合（创新基金）2012017）、贵州省科技计划项目（黔科合院所创新［2012］4003）和贵州省自然科学基金项目 （）
