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Geoscience ›› 2020, Vol. 34 ›› Issue (05): 970-978.DOI: 10.19657/j.geoscience.1000-8527.2020.05.10

• Geochemistry • Previous Articles     Next Articles

Distribution Characteristics and Source Identification of Heavy Metals in Topsoils and Subsoils of Hainan Island

ZHANG Xianyi1(), PANG Chengbao2, WANG Anting3, YUAN Guoli3(), SANG Xuezhen1, LI Yuanzhong4, YANG Yi5   

  1. 1. Shandong Geo-Mineral Co., Ltd, Jinan, Shandong 250014, China
    2. Lunan Geologic Engineering Institute, Jining, Shandong 272100, China
    3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
    4. Shandong Geological and Mining Group, Jinan, Shandong 250014, China
    5. Hainan Geological Survey Institute,Haikou,Hainan 570206,China
  • Received:2020-04-03 Revised:2020-05-27 Online:2020-10-28 Published:2020-10-29
  • Contact: YUAN Guoli

Abstract:

Geo-statistical and multivariate analyses are effective methods to determine the source and impact factors on heavy metals in the soil. The comparative analysis of contents and spatial distribution of heavy metals in topsoils and subsoils of different lithologic regions on a regional scale can also provide valuable information for distinguishing the sources of heavy metals. In our study, concentrations of 8 heavy metals were respectively measured in 8,713 topsoil samples and 2,197 subsoil samples collected from Hainan Island. The mean concentrations of As, Co, Cr, Cu, Pb, Zn, Cd, Hg in topsoils and subsoils were 5.29 mg/kg, 11.95 mg/kg, 60.79 mg/kg, 17.24 mg/kg, 26.18 mg/kg, 51.22 mg/kg, 0.081 mg/kg,0.043 mg/kg and 5.53 mg/kg, 12.89 mg/kg, 65.24 mg/kg, 19.97 mg/kg, 29.15 mg/kg, 58.87 mg/kg, 0.065 mg/kg, 0.029 mg/kg, respectively. The dominant impact factors including lithology of soil parent material, pedogenesis and human activities were figured out for heavy metals both in topsoils and subsoils by using Pearson correlation analysis and multivariate compositional analysis. The result shows that As, Co, Cr, Cu, Pb and Zn mainly come from the inheritance of soil parent material and influence of the pedogenesis, while Cd and Hg are greatly affected by the input of human activities.

Key words: heavy metal, topsoil, subsoil, geo-statistical and multivariate analysis, impact factor, HainanIsland

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