The Investigation and Evaluation of Heavy Metal State form Soil and Vegetable in the Suburb of Changsha Region

The investigation and analysis of the heavy metal contamination was conducted in several main vegetable bases in the suburb of Changsha region. The results showed that among vegetables produced form vegetable bases of the suburb of Changsha, except leaf vegetables, other vegetables were not contaminated. There were 100% of the samples whose plumbum content exceeded the standard, the most exceeded was 137% higher than the standard and averaged 60% higher than the standard; and 50% of the samples whose cadmium content exceeded the standard. the most exceeded was 127% higher than the standard, whose average cadmium content was closed to the heavy metal index of nuisanceless vegetable in China. The order of enrichment ability to heavy metal in different type of vegetables is leaf vegetablesolanaceous fruit vegetableleguminous vegetablegourd vegetable. The enriching order of heavy of heavy metal is CdHgPbAsCr. The heavy metal contamination in soils of the suburb of Changsha city is much serious. There are Cd contamination in 70% of soil, and Hg contamination in 27.6% of soil,while comprehensive contamination of heavy metal in 58.6% of soil. The related department should take the feasible measures to control the further extended and fast contamination.