ABSTRACT The thermal-activated serpentine prepared by heating natural serpentine at different temperatures was used to immobilize cadmium (Cd) in simulated contaminated soils. The results showed that the increasing soil pH induced by adding serpentine was primarily responsible for reducing the content of TCLP-Cd (toxicity characteristic leaching procedure-Cd) in soil. Furthermore, adding thermal-activated serpentine could promote the transformation from exchangeable form of Cd in soil to low bioavailable Cd (Fe-Mn oxides, carbonate, and residual form) by surface adsorption and surface precipitation, and then reduced the bioavailability of Cd in soil. Under the same treatment condition, adding S700 (serpentine activated at 700°C) exhibited better performance to immobilization of Cd, and it could reduce exchangeable Cd by 23.76~36.49%, and increase carbonate, Fe-Mn oxide, and residual form of Cd by 6.03~8.03%, 6.05~8.35%, and 11.17~19.58%, respectively. These results indicated that thermal-activated serpentine would be the great potential for immobilization of Cd in soil.

中文翻译：

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使用热活化蛇纹石固定模拟污染土壤中的镉

摘要 通过在不同温度下加热天然蛇纹石制备的热活化蛇纹石用于固定模拟污染土壤中的镉 (Cd)。结果表明，添加蛇纹石引起的土壤pH值升高是降低土壤中TCLP-Cd（毒性特征浸出程序-Cd）含量的主要原因。此外，添加热活化蛇纹石可以通过表面吸附和表面沉淀促进土壤中 Cd 从可交换形式向低生物利用度 Cd（Fe-Mn 氧化物、碳酸盐和残留形式）转变，进而降低土壤中 Cd 的生物利用度。 . 在相同处理条件下，加入S700（700℃活化蛇纹石）对Cd的固定表现更好，可减少23.76~36.49%的可交换Cd，碳酸盐、Fe-Mn氧化物和Cd残留形态分别增加6.03~8.03%、6.05~8.35%和11.17~19.58%。这些结果表明，热活化蛇纹石将是土壤中 Cd 固定化的巨大潜力。