Potential ecological risk of cadmium, lead and arsenic in agricultural black soil in Jilin Province, China |
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| Authors: | Hui-cong Cao Zhao-qing Luan Jin-da Wang Xue-lin Zhang |
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| Institution: | (1) Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, China |
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| Abstract: | Potential ecological risk of cadmium (Cd), lead (Pb) and arsenic (As) in agricultural black soil in Jilin Province, China
was analyzed by the methods of risk assessment based on dose–effect relationships and ecological risk index. Heavy Cd-contamination
occurred mainly around the coal mine region. The accumulation area for Pb appeared mostly in the suburbs and roadsides, whereas
the higher As content was mainly found in the farmland of suburb and coal mine vicinity. In acute toxicity test, Cd, Pb and
As in the soil had adverse effects on both roots and shoots growth in soybean with the greatest toxicity of arsenic and the
least toxicity of lead at the same concentration levels. Exposed to Cd, Pb and As, the EC50 (50% effective concentration) values for the growth of soybean root (shoot) were 212.59 (376.70), 528.53 (828.69) and 194.60
(299.03) mg/kg, respectively. Results of potential ecological risk index showed that soil contamination from Cd in some samples
had very high potential ecological risk; Pb contamination for almost all sampling sites had moderate ecological risk; while
soil contamination from As had low ecological risk. With the present accumulation rate, concentrations of Cd, Pb and As in
agricultural black soil near coal mine would reach the threshold values in 68, 175 and 120 years, respectively. |
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| Keywords: | Agricultural black soil Cd Pb As Dose– effect Jilin Province Potential ecological risk |
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