期刊
POLISH JOURNAL OF ENVIRONMENTAL STUDIES
卷 28, 期 5, 页码 3799-3807出版社
HARD
DOI: 10.15244/pjoes/94847
关键词
cadmium; soil; spatial distribution; fraction; migration mechanism
资金
- National Natural Science Foundation of China [41461097]
- United Fund of the National Natural Science Foundation for Guizhou Province [U1612442]
- Significant Special Program of Guizhou Province [[2015] 2001]
- Educational Program of Guizhou Province [[2016] 001]
The karst terrain of Guizhou in southwestern China is ecologically fragile, but has undergone severe heavy metal contamination. To assess such contamination, the spatial distribution of cadmium (Cd) within soils was studied in a lead (Pb)-zinc (Zn) smelting area, coal mining area, Pb-Zn mining area, sewage irrigation area, and an uncontaminated area. Cd concentrations were highest in topsoil, with the highest value of 23.36 mg/kg in the Pb-Zn mining area and lowest value of 0.46 mg/kg in the uncontaminated area. Cd content decreased from 0 to 0.8 m depth, then sharply increased, reflecting Cd precipitation within the contaminated soil profiles. Migration of Cd within the soil was affected by organic content in the Pb-Zn smelting area (R-2 = 0.99**), coal mining area (r = 0.72*), and Pb-Zn mining area (r = 0.73*). In contrast, Cd accumulated within a clay horizon in the uncontaminated area, where the correlation between Cd and specific surface area was 0.78**; Cd concentrations reached 2.11 mg/kg within this horizon. Reducible, oxidizable, and acid-exchangeable fractions accounted for 60-80% of total Cd in soils having pH values of 5.05-6.86. This indicates that Cd could easily transfer from soil to food or water, leading to human health and environmental risks.
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