A highly effective, economical, and replicable way is imperative to remediate Cadmium (Cd)-polluted soil. Shell powder is sometimes used to remediate soil contaminated with potentially toxic metals. However, information is limited regarding shell powder assessment. Shell powder is thermally modified at 400, 600, and 800 °C and is added to Cd-polluted soil for 50 days. The repair effects of shell powder on Cd-polluted soil are investigated. Compared with the control, the addition of shell powder passivator reduces the content of exchangeable Cd in the soil and converts the exchangeable fraction into other unavailable fractions, especially carbonate-bound Cd. On average, the value of soil pH increases by one to two units after the application of the powder. Shell powder improves the physical and chemical properties of the soil. Redundancy analysis, entropy method, literature analysis, and theoretical analysis are used for evaluation. Finally, the repair effect score for each treatment group is obtained, and it proves to be a more intuitive method of evaluation. Overall, the results of this study indicate that shell powder is a suitable passivator for the remediation of Cd-polluted soil. Using a score to express the repair effect is an appropriate evaluation method.

中文翻译：

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镉污染土壤中贝壳粉修复效果评价：基于熵指数的评分方法

一种高效、经济且可复制的方法对于修复镉 (Cd) 污染的土壤势在必行。壳粉有时用于修复被潜在有毒金属污染的土壤。然而，关于壳粉评估的信息有限。壳粉在 400、600 和 800 °C 下进行热改性，并添加到 Cd 污染的土壤中 50 天。研究了贝壳粉对镉污染土壤的修复效果。与对照相比，添加壳粉钝化剂降低了土壤中可交换态Cd的含量，并将可交换态部分转化为其他不可用部分，尤其是碳酸盐结合态Cd。平均而言，施用粉末后土壤 pH 值增加一到两个单位。贝壳粉可改善土壤的物理和化学性质。冗余分析，评价采用熵法、文献分析法和理论分析法。最后得到各治疗组的修复效果评分，证明是一种更直观的评价方法。总体而言，本研究结果表明，贝壳粉是修复 Cd 污染土壤的合适钝化剂。用分数来表达修复效果是一种合适的评价方法。