Characteristics and DGT Based Bioavailability of Cadmium in the Soil–Crop Systems from the East Edge of the Dongting Lake, China

Jun Guo, Zhiying Wei, Chao Zhang, Cong Li, Liangliang Dai, Xin Lu, Kaiqi Xiao, Xiong Mao, Xiuwen Yang, Yiming Jing, Jiaquan Zhang, Wei Chen () and Shihua Qi
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Jun Guo: Changsha Natural Resources Comprehensive Investigation Center, China Geological Survey, Changsha 410600, China
Zhiying Wei: School of Environmental Studies and Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430078, China
Chao Zhang: School of Environmental Studies and Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430078, China
Cong Li: Changsha Natural Resources Comprehensive Investigation Center, China Geological Survey, Changsha 410600, China
Liangliang Dai: Changsha Natural Resources Comprehensive Investigation Center, China Geological Survey, Changsha 410600, China
Xin Lu: Changsha Natural Resources Comprehensive Investigation Center, China Geological Survey, Changsha 410600, China
Kaiqi Xiao: Changsha Natural Resources Comprehensive Investigation Center, China Geological Survey, Changsha 410600, China
Xiong Mao: Changsha Natural Resources Comprehensive Investigation Center, China Geological Survey, Changsha 410600, China
Xiuwen Yang: School of Environmental Studies and Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430078, China
Yiming Jing: School of Environmental Studies and Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430078, China
Jiaquan Zhang: Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China
Wei Chen: Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China
Shihua Qi: School of Environmental Studies and Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430078, China

IJERPH, 2022, vol. 20, issue 1, 1-11

Abstract: Contamination of heavy metals (including the cadmium, Cd) in agricultural soils has become an increased issue, posing a threat to the crop safety and human health. In order to evaluate the contamination characteristics and bioavailability of Cd in the soil–crop systems from the East edge of the Dongting Lake, four kinds of agricultural products for typical crops (rice, peanut, sweet potato, and corn) and corresponding rhizosphere soils were collected and analyzed for the Cd concentrations. The technique of diffusive gradients in thin-films (DGT) was applied to evaluate the Cd bioavailability in the rhizosphere soils. Concentrations of Cd ranged from 0.04 to 2.95 mg/kg (average 0.24 mg/kg) with 73.9% sites above the background levels, especially for paddy soils. Cd concentrations in the agricultural products ranged from 0.01 to 2.19 mg/kg (average 0.18 mg/kg), with Cd enrichment observed in the peanut samples. No obvious correlations (R 2 < 0.25) were observed between the Cd concentrations in the agricultural products and total Cd concentrations in the rhizosphere soils, this indicated that the total Cd concentrations in the soils cannot predict the concentrations in the agricultural products of crops. While the DGT measured Cd concentrations showed good correlations (R 2 = 0.64–0.90) with the concentrations in the most agricultural products of crops, which may be used to evaluate the safety of the soil and further safety of the agricultural products of crops. Overall, DGT showed a good potential for prediction of heavy metal bioavailability in soil since the DGT technique can simulate the sustained supply of heavy metals from solid to liquid in the soils.

Keywords: cadmium (Cd); diffusive gradients in thin-films (DGT); bioavailability; food safety; Dongting Lake (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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