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| Distribution of Heavy Metals in Humic Acids of Iron Mine Soil in Upper Area of Miyun Reservoir, Beijing |
| Received:August 06, 2014 |
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| KeyWord:heavy metals;humic acid;distribution;correlation analysis;enrichment factor analysis |
| Author Name | Affiliation | E-mail | | NIE Yi-ning | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China | | | ZHANG Ai-xing | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China | | | GAO Yang | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China | | | JI Hong-bing | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China
National Environment & Energy International Cooperation, University of Science & Technology Beijing, Beijing 100083, China | jih_0000@126.com |
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| Abstract: |
| Interaction of heavy metals with humic acid(HA) in soils may affect their movement and bioavailability. Here we measured the concentrations of heavy metals in iron mine soils and humic acids extracted from the soils at the depth of 0 to 20 cm and 20 to 40 cm in the upper area of Miyun reservoir, Beijing. Humic acids were extracted with a method from International Humic Substance Society(IHSS). The concentrations of heavy metals and humic acids were determined by ICP-MS. The relationship between humic acids and heavy metals was analyzed by correlation analysis and enrichment factor analysis. The results show that the average concentrations of V, Cr, Co, Ni, Cu, Zn, Cd and Pb in the soils samples were higher at 0 to 20 cm than at 20 to 40 cm. The average concentrations of Cr and Cd in humic acids were lower at 0 to 20 cm than at 20 to 40 cm, but those for other metals were just opposite. Soil depth affected heavy metal association with humic acids. Significant positive correlations were found between V, Cr, Co, Ni, Cu, Cd, and Pb and organic matter and HA, while significant negative correlations existed between V, Co, Cu, Cr, Ni, and Zn and the ratio of HA to OM(HA/OM). The enrichment factor analysis showed that Cu had a greater affinity, but V, Cr, Ni, Zn and Pb a weaker affinity for humic acids. Compared to soils at 20 to 40 cm, V, Cr, Co, Ni, Cu, Zn and Pb had a stronger enrichment but Cd had a weaker accumulation in the humic acids of soils at 0 to 20 cm. These results indicate that soil humic acids from different depths have different metal accumulation characteristics. |
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