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[1]YANG Congli,WANG Baiqun,SHEN Guoting,et al.Pb Pollution Characteristics and Their Affecting Factors in Different Land Use Types in Lead-Zinc Mining Zone[J].Research of Soil and Water Conservation,2018,25(05):351-357.

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Pb Pollution Characteristics and Their Affecting Factors in Different Land Use Types in Lead-Zinc Mining Zone

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 05 Page number: 351-357 Column: Public date: 2018-09-06

Title:: Pb Pollution Characteristics and Their Affecting Factors in Different Land Use Types in Lead-Zinc Mining Zone

Author(s):: YANG Congli¹, WANG Baiqun^1,2,3, SHEN Guoting⁴, WANG Mengke⁴; 1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
4. College of Natural Resources and Environment, Yangling, Shaanxi 712100, China

Keywords:: Pb-Zn mine; land use types; BCR extraction procedures; speciation; affect factors

CLC:: X53

DOI:: -

Abstract:: Soil pollution by heavy metals was characterized in the mine tailing and surrounding farmland, woodland and grassland in an old Pb-Zn mining zone of Baoji. Thirty-eight soil samples were taken and the total Pb concentrations of soil samples were determined by acid digestion, and the chemical fractionation of Pb was analyzed with the modified BCR sequential extraction method. In the present study, it was found that the characteristics of soil Pb accumulation in different land use types were significant different, the contents of soil Pb decreased in the order:farmland (410.1 mg/kg) > woodland (315.9 mg/kg) ≈ grassland (313.6 mg/kg). At the same time, the results of sequential extraction showed that the most of Pb in soils was associated with Fe-Mn oxides faction, followed by acid-exchangeable faction and organic-sulfide faction, and residual faction was rather low. Additionally, the spatial distribution characteristics of total Pb concentration and fractions were significant different in three land use types. The soil total Pb concentration of woodland was no significant difference from that of the grassland, while the average percentage of acid-exchangeable fraction of the grassland was significantly higher than that of the woodland. Meanwhile, the total Pb concentration and speciation characteristics were influenced by soil physical and chemical properties as well as land use types. There were positive correlations between soil Pb accumulation, sand particles, and pH in farmland and woodland, which were related to the anthropogenic activities such as mining and transport of metal ores. There were negative correlations between the contents of total Pb and sand particles in the grassland. There were positive correlations among the total Pb, clay particles, and Fe-Mn oxides fraction. It was related to mine soils and superficial geochemical forms. In general, the anthropogenic activities such as mining,cultivation practices and management aprroaches had the important impact on the Pb pollution characteristics in soils of the mining area.

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