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| Arsenic stabilization in soil of development land in northeast China |
| Received:December 30, 2022 |
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| KeyWord:arsenic;leaching concentration;fraction;stabilization;site soil |
| Author Name | Affiliation | E-mail | | OU Chenghao | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China
Shenyang Institute of Environmental Sciences, Shenyang 110167, China | | | SU Yan | Shenyang Institute of Environmental Sciences, Shenyang 110167, China | | | TIAN Chuqi | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | GUAN Xiujing | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | JIANG Shaoyuan | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | WANG Jian | Shenyang Institute of Environmental Sciences, Shenyang 110167, China | | | DANG Xiuli | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | dxl@syau.edu.cn |
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| Abstract: |
| To evaluate the effects of various environmental conditions on the stabilization of As in soil of development land, FeCl3 with different additions (Fe/As molar ratio 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, and 8:1, respectively) was added to stabilize As in contaminated soil at a smelting plant in Liaoning Province. The suitable amount of FeCl3 for stabilization was selected by measuring the leaching concentrations and fractions of As. The effects of FeCl3 addition on As stabilization under the various environmental conditions were assessed by measuring the leaching concentration of As in stabilized soil with different pH levels and different liquid-solid ratios. The results showed that compared with no FeCl3 addition, the leaching concentration of As decreased by 84.9%-92.8% among FeCl3 addition treatments (P<0.05), and the minimum leaching concentration of As occurred under the treatment of Fe/As at a molar ratio of 6:1, and the stabilization effect was the best. The addition of FeCl3 promoted the transformation of As from the nonspecific adsorption state and specific adsorption state with high activity to the residual state with low activity, and the available As content decreased by 6.9%-8.4%. The leaching concentration of As under neutral and alkaline extraction conditions increased significantly, compared to those under the acidic extraction conditions. The leaching concentration of As was the lowest when the pH of the extraction solution was 4, and it was the highest at a pH of 13; the leaching concentration of As increased by 584.4%, comparing the two conditions. The leaching concentration of As increased significantly (P<0.05) under the lower liquid-solid ratio of the extraction system, compared to the higher liquid-solid ratio of the extraction system. The leaching concentration of As was the lowest and the leaching rate was the largest when the liquid-solid ratio of the extraction system was 20:1, while the leaching concentration of As was the highest and the leaching rate was the lowest when the liquid-solid ratio of the extraction system was 1:1. The results showed that FeCl3 addition can effectively reduce the leaching concentration of As by changing the As fractions in soil of development land, and the alkaline and the lower liquid-solid ratio of extraction system increase the environmental risk of As in stabilized soil. It is thus recommended to select the corresponding pH and liquid-solid ratio for an extraction system according to the actual soil environment so as to safely evaluate the stabilization effect and the environmental risk of As in soil of development land. |
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