Soil environment quality investigation of harmless vegetables base in Guiyang and evaluation

In this paper presented a result of a study on soil environmental quality by monitoring heavy metal ion(Hg,As,Pb,Cd,Cr)in top and bottom soil(53 samples)of vegetables bases in White Cloud region of Guiyang,Xiuwen county,Xifeng county,Qingzhen city,Kaiyang county,Qingyan,Jinzhu and Ali.The present situation of the soil environment quality is evaluated by the single factor index method and.Nemerow syntheszed index method and standards such as GB/T18407.1-2001《Safe quantities in the agricultural product environment requests of the harmless vegetables》.The analysis result is:the contents of 5 kinds of heavy metal ions in the most part of the soils which come from the harmless vegetables bases of Guiyang are within the scope of GB/T18407.1-2001 provisions,but the arsenic,chrome contents of individual soil comes to a light degree which exceed the scope.For example,the arsenic single content in the bottom soil in White Cloud reachs 0.796 8,the chrome in Wudang is up to 0.754 2.Both of them are in the range from 0.7 to 1.0.The synthesis contaminative indexes of the heavy metals in total soil as 0.378 5,0.420 4,less than 0.7,belonging to the level of safety and cleanliness.The soil environment quanlity is 1 class.