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- W2977994088 abstract "The paper is aimed at an investigation on the immobilization of Pb,Cd and As in the contaminated soil by using the phosphorus and ferric amendments and the process optimization.We have evaluated the effects of the phosphorus and ferric amendments on immobilization of Pb,Cd and As in contaminated soil by DTPA and NaH CO3 extractable methods. The experimental tests we have done prove that the monocalcium phosphate( Ca( H2PO4)2) can effectively immobilize the available Pb and Cd in the contaminated soils by a percentage of 61% and 38% after 35 d,respectively. Ferric sulfate( Fe2( SO4)3) could decrease the available As by 74. 6% after 28 d. The results of the optimized application condition of Ca( H2PO4)2and Fe2( SO4)3indicate that:( 1) The concentrations of the available Pb and Cd can obviously be reduced with the increased dosage of Ca( H2PO4)2.However,no serious effect tends to be made on the available Pb immobilization on the condition when the water content in the soil is at a range of 60%-80% of the maximum field water capacity,although available Pb immobilization efficiency at 60%-80% of the maximum field water capacity is higher than that at 30%-50%of the maximum field water capacity. The effective removal of available Cd can be found when at 60%-80% of the maximum field water capacity. And the removal efficiency of available Pb and Cd would also like to reach 93% and 39% after 21 d on the condition when the molar ratio of Ca( H2PO4)2to Pb and Cd is equal to 10: 1 and the water content in the soil reaches 60% of the maximum field water capacity.( 2) The immobilization effect of the available As can be noticeably raised with the increased dosage of Fe2( SO4)3. For example,when the molar ratio between Fe2( SO4)3and As is made equal to 1: 3. 06,the removal rate of available As can be made to go up to 74. 5% from the contaminated soil after 28 d. Moreover,the mixture of Ca( H2PO4)2and Fe2( SO4)3can immobilize Pb,Cd and As simultaneously. When the molar ratio of Fe3 +to PO3-4is equal to 7. 2: 1,the removal efficiency of the available Pb,Cd and As can be made up to 99%,41% and 69% after 7 d,respectively. Thus,the results of our research shall be able to provide a technical support for the remediation of the soils complexly contaminated by heavy metals." @default.
- W2977994088 created "2019-10-10" @default.
- W2977994088 creator A5055834787 @default.
- W2977994088 date "2015-01-01" @default.
- W2977994088 modified "2023-09-26" @default.
- W2977994088 title "Remediation effects of phosphorus and ferric amendments on the soil complexly contaminated by Pb,Cd and As and the process optimization" @default.
- W2977994088 hasPublicationYear "2015" @default.
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