| Spatial distribution characteristics of total concentrations and forms of lead and cadmium in farmland soil nearby a smelter in Baoji |
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| DOI：10.7606/j.issn.1000-7601.2014.04.036 |
| Key Words: soil heavy metal form spatial distribution wheat |
| Author Name | Affiliation | | XU Shao-e1, HAO Jun-liang2, MENG Zhao-fu1,5, WANG Yao2, LI Lu2, PENG Ge2, BAI Zhao3, YANG Shu-ying4, LI Bin4, LI Zhong-qiang1 | （1.西北农林科技大学资源与环境学院， 陕西 杨凌 712100； 2.陕西省固体废物管理中心，陕西 西安 710054； 3.陕西省环境监测中心站， 陕西 西安 710054； 4.西北农林科技大学理学院， 陕西 杨凌 712100； 5.农业部西北植物营养与农业环境重点实验室， 陕西 杨凌 712100） |
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| Abstract: |
| Aimed at providing the basis for characterization of heavy metals in contaminated soils, the spatial distribution characteristics of total concentrations and forms of Pb, Cd in the farmland soil nearby a smelter in Baoji City, Shaanxi Province were investigated by using Kriging interpolation method, and the correlation between total concentrations and various forms of Pb, Cd in soil and their concentrations in wheat was analyzed. The results showed that the concentrations of various forms of Pb was sequenced as: residual form > organic-sulfide form > Fe-Mn oxide from > exchangeable form, while that of Cd was sequenced as: exchangeable form > residual form > organic-sulfide form > Fe-Mn oxide form. The concentrations of total Pb and Fe-Mn oxide form of Pb and Cd in soil samples at 500 m from the smelter were significantly higher than those at 1 500 m and 2 500 m, but there was no significant difference between the later two distances. As for the concentrations of total Cd and the other three forms of Pb, Cd, there was no significant difference among the three sampling distances. The results of Kriging interpolation analysis showed that, except for exchangeable form of Pb, the spatial distribution of other forms of Pb, Cd corresponded to the characteristic of wind direction in the research area. Correlation analysis showed that the exchangeable and Fe-Mn oxide forms of Pb, Cd in soil samples were significantly correlated with concentrations of Pb, Cd in wheat samples. Therefore, the exchangeable and Fe-Mn oxide forms of Pb, Cd in soil samples could both be used as the characterization indicators of heavy metal pollution in drylands nearby a smelter. |
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