Pedosphere 19(3): 305--311, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Heavy metal transfer from soil to vegetable in southern Jiangsu Province, China |
HAO Xiu-Zhen1,2, ZHOU Dong-Mei1 , HUANG De-Qian1,2, CANG Long1,2, ZHANG Hai-Lin3 and WANG Hui1,2 |
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2 Graduate University of the Chinese Academy of Sciences, Beijing 100049 (China)
3 Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, Ok 74078 (USA) |
| ABSTRACT |
| Vegetable fields in peri-urban areas receive large amounts of extraneous heavy metals because of rapid urbanization and industrialization in China. The concentrations of Cu, Zn, and Pb in 30 soil samples and 32 vegetable samples, collected from 30 different sites in southern Jiangsu Province of China, were measured and their transfer from soil to vegetable was determined. The results showed that the soil samples had wide ranges of pH (4.25-7.85) and electrical conductivity (EC) (0.24-3.42 dS m-1). Among the soil samples, there were four soil samples containing higher Cu and two soil samples containing higher Zn concentrations than those specified in the Chinese Soil Environmental Quality Standard II. However, no vegetable sample was found to contain a high level of Cu or Zn. In contrast, one vegetable sample contained 0.243 mg Pb kg-1 FW, which was above the Chinese Food Hygiene Standard, whereas the corresponding soil Pb concentration was lower than the Chinese Soil Environmental Quality Standard II. The transfer coefficients of Cu of all vegetable samples exceeded the suggested coefficient range, implying that extraneous Cu had high mobility and bioavailability to vegetables. There was no significant correlation between extractable soil heavy metal concentrations with four kinds of extractants and soil pH, EC, heavy metal concentrations in vegetables and soils, except that soil pH correlated well with the extractable soil Cu, Zn, and Pb concentrations with 1.0 mol L-1 NH4NO3. Moreover, diethylenetriamine pentaacetic acid (DTPA) extraction method was a more effcient method of extracting heavy metals from the soils independent of soil pH and EC than other three methods used. |
| Key Words: heavy metal, soil, transfer coefficients, vegetable |
| Citation: Hao, X. Z., Zhou, D. M., Huang, D. Q., Cang, L., Zhang, H. L. and Wang, H. 2009. Heavy metal transfer from soil to vegetable in southern Jiangsu Province, China. Pedosphere. 19(3): 305-311. |
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