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| Analysis of Seven Heavy Metal Elements Pollution in Soil of Bulk Open-air Vegetable Production Areas in China |
| ZHONG Kecheng1，WANG Qianyu1，JIA Qiyuan1，LI Jianmin1，LUO Chunli1，XU Kexin1，HUANG Ting1，LI Shuqing2，ZOU Jianwen2，CHEN Yahua1* |
| 1College of Life Sciences，Nanjing Agricultural University，Nanjing 210095，Jiangsu，China；2College of Resources and Environmental Sciences，Nanjing Agricultural University，Nanjing 210095，Jiangsu，China |
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Abstract This paper conducted Cd，Pb，Cr，Zn，Cu，Hg，As，etc. 7 heavy metal content pollution risk assessment of 133 soil samples collected from 41 experimental sites and 59 sampling points in bulk open-air vegetable production areas of China．The results showed that the soil average value of Cd content from all sample sites was 0.2 mg · kg-1，among them soil sample Cd contents of 14 sampling points was higher than the risk screening value，accounting for 23.7% of the total sampling points．The sampling points with serious Cd pollution exceeding standard were mainly distributed in central China Changsha，southern China Nanning and southwestern China Pan Zhihua，etc．The highest value of soil Cd content exceed standard was 1.3 mg · kg-1． Except one sampling site in Kunming Yunnan its soil Cu content and one sampling site in Haidian Beijing its soil Hg content were higher than risk screening value，the soil Cu and Hg and Pb，Cr，Zn，As contents in the rest sampling sites were all within safe limits．Cd pollution in bulk open-air vegetable production areas in China deserves special attention．
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