| 磷基材料对土壤铅稳定化效果及影响因素的Meta分析 |
| 摘要点击 2552 全文点击 829 投稿时间：2022-11-22 修订日期：2022-12-20 |
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| 中文关键词 磷基材料 土壤Pb 稳定化 土壤修复 Meta分析 |
| 英文关键词 phosphorus Pb in soil immobilization soil remediation Meta analysis |
| DOI 10.13227/j.hjkx.20231037 |
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| 中文摘要 |
| 磷基材料对土壤Pb有良好的稳定化效果.利用Meta分析法筛选汇总了1997~2022年磷基材料稳定土壤Pb的90篇文献，从土壤性质、稳定化工艺条件和磷基材料类型这3个方面量化分析了磷基材料对土壤Pb的稳定化率、赋存形态转化和对土壤pH的影响.结果表明，从土壤性质来看，土壤碱性越强（pH≥7.5）、土壤ω（Pb）越低（≤500 mg ·kg-1）和土壤ω（有机质）越高（>0.5%）时，越有利于磷基材料对土壤Pb的稳定化，稳定化率分别为75.21%、34.97%和93.12%.从稳定化工艺条件来看，磷基材料添加量较高（≥10%）、含水率较高（>50%）、养护时间较长（≥30d）和养护温度较高（≥40℃）时，更有利于土壤Pb的稳定化，稳定化率可分别达到80.65%、84.98%、79.39%和41.44%.从磷基材料类型来看，可溶性磷基材料对土壤Pb有很高稳定化率（96.24%）；其使土壤可交换态Pb和碳酸盐结合态Pb向残渣态Pb转化的转化率达到95.93%；可溶性磷基材料多呈酸性，对土壤pH的降低率为7.27%，难溶性磷基材料多呈碱性，对土壤pH的增加率为3.63%.综上，在土壤pH≥7.5、土壤ω（Pb）≤500 mg ·kg-1、土壤ω（有机质）>0.5%、可溶性磷基材料添加量≥10%、含水率>50%、养护时间≥30 d和养护温度≥40℃时，磷基材料对土壤Pb的稳定化效果较好.可见在实际Pb污染土壤修复过程中，为提高Pb稳定化率，需综合考虑土壤性质、稳定化工艺条件和磷基材料类型等因素的影响. |
| 英文摘要 |
| Phosphorus exerts a good stabilization effect on soil lead. In this study, the findings of 90 papers were summarized using the Meta-analysis method. These papers described the immobilization of soil lead using phosphorus from 1997 to 2022. The effects of phosphorus materials on the stabilization rate and speciation transformation of soil Pb and soil pH were quantitatively analyzed based on soil properties, stabilization process conditions, and types of phosphorus materials. The results revealed that the stronger the soil alkalinity (pH ≥ 7.5), the lower is the content of lead (≤ 500 mg·kg-1), and the higher the content of soil organic matter (>0.5%), the more conducive it is to the phosphorus-based stabilization of soil lead; the stabilization rates are 75.21%, 34.97% and 93.12%, respectively. In terms of stabilization process conditions, the higher the addition amount of phosphorus (≥ 10%), the higher is the water content (>50%)and longer is the curing time (≥ 30 days), and the higher the curing temperature (≥ 40℃), the more conducive it is to the stabilization of soil lead, and the stabilization rates are 80.65%, 84.98%, 79.39%, and 41.44%, respectively. According to the types of phosphorus, soluble phosphorus had a high stabilization rate of soil lead (96.24%). The conversion rate of exchangeable lead and carbonate-bound lead to residual lead was 95.93%. Soluble phosphorus was majorly acidic, reducing the soil pH by 7.27%, whereas insoluble phosphorus was majorly alkaline, increasing the soil pH by 3.63%. In conclusion, when the soil pH ≥ 7.5, soil lead content ≤ 500 mg·kg-1, soil organic matter content >0.5%, soluble phosphorus addition ≥ 10%, water content >50%, curing time ≥ 30 days, and curing temperature ≥ 40℃, phosphorus had a better effect on soil Pb stabilization. In the actual remediation process of lead-contaminated soil, to improve the lead stabilization rate, it is necessary to comprehensively consider the effects of soil properties, stabilization process conditions, phosphorus, and other factors. |
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