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| Effects of simulated acid rain on the leachability of phosphorus in agricultural soils amended with phosphorous compounds |
| Received:February 25, 2021 |
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| KeyWord:passivation remediation;phosphorous compounds;acid rain;phosphorus leachability;phosphorus availability |
| Author Name | Affiliation | E-mail | | ZHANG Jinlu | Department of Agricultural Resources and Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WU Chunfa | Department of Agricultural Resources and Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China | wchf1680@sina.com | | ZHANG Yu | Department of Agricultural Resources and Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WANG Chong | Department of Agricultural Resources and Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | FU Zhaocong | Department of Agricultural Resources and Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China | |
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| Abstract: |
| This study evaluated the effects of simulated acid rain(SAR) on the leachability and availability of phosphorus(P) in cadmium (Cd) -contaminated agricultural soils amended with P compounds. Cd-contaminated soils were treated with calcium dihydrogen phosphate (MCP), ammonium dihydrogen phosphate(MAP), and potassium dihydrogen phosphate(MKP), and incubated for 3 months. These treatments were followed by two types of SAR[sulfuric acid rain(SSAR) and mixed acid rain(SMAR)] with three levels of acidity(pH=3.0, 4.0, and 5.6). The total water-soluble P(TDP) of the leachate and available P(AP) in the soils were determined. The results showed that the leachability of P in MAP- and MKP-stabilized soils was significantly higher than that in controls(CK), being 32.63%~38.57% and 41.48%~49.29%, respectively. However, there was no significant difference in P leachability between the MCP-stabilized soils and the CK. Leachability of P decreased with increasing SAR pH. Additionally, the leachability of P in the SSAR treatments was higher than that in the SMAR treatments. The application of the three P compounds significantly increased AP concentration in soils. However, the AP concentration in the three stabilized soils significantly decreased after SAR soaking, in the order of MCP > MAP > MKP. Additionally, the AP concentration in the SSAR treatment was lower than that in the SMAR treatment. Therefore, MCP is more suitable for passivation in Cdcontaminated agricultural soils in acid rain areas than MAP and MKP, according to the leaching risk and availability of P in soils. |
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