Investigations of heavy metals in various soils in Guiyang city

This paper presented results of soil environmental quality by determining heavy metals (Hg,As,Pb,Cd,Cr)in top and sub-top(53 vegetable base) of vegetable soils in White Cloud region of Guiyang,Xiuwen county,Xifeng county,Qingzhen city,Kaiyang county,Wudang region,Xiaohe region,and Huaxi region.The present situation of the soil environment quality is evaluated by the single factor index method and N.L.Nemerow synthesized index number method and standards such as GB/ T18407.1—2001《 Safe quantities in the agricultural product and environment requests of the harmless vegetables 》.The result indicated that the contents of 5 kinds of heavy metals in the most part of the soils come from the harmless vegetable soils of Guiyang were within the scope of GB/ T18407.1 — 2001,but arsenic,chrome contents of individual soil excess the scope to a light degree.For example,the arsenic content in the sub-top soil in White cloud reached 0.7968,the chrome in Wudang was up to 0.7542.Both of them were in the range of 0.7 to 1.0.The integrationindex of the heavy metals in total soil were 0.3785 and 0.4204,less than 0.7,belonging to the level of safety and cleaness.The soil environment quality belonged to first grade.