Vertical Distribution and Controlling Factors Exploration of Sc, V, Co, Ni, Mo and Ba in Six Soil Profiles of The Mun River Basin, Northeast Thailand

Wenxiang Zhou, Guilin Han, Man Liu, Chao Song, Xiaoqiang Li and Fairda Malem
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Wenxiang Zhou: Institute of Earth Sciences, China University of Geosciences, Beijing 10083, China
Guilin Han: Institute of Earth Sciences, China University of Geosciences, Beijing 10083, China
Man Liu: Institute of Earth Sciences, China University of Geosciences, Beijing 10083, China
Chao Song: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
Xiaoqiang Li: Institute of Earth Sciences, China University of Geosciences, Beijing 10083, China
Fairda Malem: Environmental Research and Training Center, Department of Environmental Quality Promotion, Klong 5, Klong Luang, Pathumthani 12120, China

IJERPH, 2020, vol. 17, issue 5, 1-14

Abstract: Exploring the enrichment and controlling factors of heavy metals in soils is essential because heavy metals can cause severe soil contamination and threaten human health when they are excessively enriched in soils. Soil samples (total 103) from six soil profiles (T1 to T6) in the Mun River Basin, Northeast Thailand, were collected for the analyses of the content of heavy metals, including Sc, V, Co, Ni, Mo, Ba. The average contents of soil heavy metals decrease in the following order: Ba, V, Ni, Sc, Co, and Mo (T1, T3, T4 and T5); Ni, V, Ba, Co, Sc, Mo, and Ba (T2); Ba, V, Sc, Ni, Mo, and Co (T6). An enrichment factor (EF) and geoaccumulation index were calculated to assess the degree of heavy metal contamination in the soils. The EFs of these heavy metals in most samples range from 0 to 1.5, which reveals that most heavy metals are slightly enriched. Geoaccumulation indexes show that only the topsoil of T1 and T2 is slightly contaminated by Ba, Sc, Ni, and V. Soil organic carbon (SOC), soil pH and soil texture are significantly positively correlated with most heavy metals, except for a negative correlation between soil pH and Mo content. In conclusion, the influence of heavy metals on soils in the study area is slight and SOC, soil pH, soil texture dominate the behavior of heavy metals.

Keywords: soil heavy metals; enrichment factor; geoaccumulation index; Mun River Basin; Northeast Thailand (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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