Precipitation, adsorption and rhizosphere effect: The mechanisms for Phosphate-induced Pb immobilization in soils-A review
Precipitation, adsorption and rhizosphere effect: The mechanisms for Phosphate-induced Pb immobilization in soils-A review
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沉淀、吸附和根际效应：磷酸盐诱导土壤中 Pb 固定的机制 - 综述
DOI：
10.1016/j.jhazmat.2017.05.038
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Jiang Danni
中科院分区：
文献类型：
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作者：
Zeng Guangming;Wan Jia;Huang Danlian;Hu Liang;Huang Chao;Cheng Min;Xue Wenjing;Gong Xiaomin;Wang Rongzhong;Jiang Danni
铅是毒性最大的重金属之一，对生物体构成直接威胁，不能通过微生物活动或化学反应降解。铅的生物可利用性和生态毒性主要取决于铅的化学形态，在铅污染土壤的修复中起着重要作用。磷酸盐(P)改良剂可以将铅从不稳定形态转化为稳定形态，是土壤中固定铅的常用手段，近几十年来得到了研究者的广泛研究。在前人研究的基础上，总结出磷诱导铅固定的三种主要机制：1)铅-磷酸盐的沉淀，包括直接沉淀、离子交换(或取代)效应和石灰效应；2)铅的吸附，包括直接吸附和铅在铁(氢)氧化物上的吸附；3)根际效应，包括酸化效应和菌根效应。为了更好地了解土壤中磷诱导的铅固定作用，促进磷基修复技术的发展，本文对这些机理进行了全面的讨论，并总结了它们之间的内在联系。
Lead (Pb) is one of the most toxic heavy metals that pose a direct threat to organisms and it can not been degraded through microbial activities or chemical reaction. Bioavaibility and eco-toxicity of Pb which mostly depend on Pb chemical speciation play an important role in the remediation of Pb-contaminated soils. Phosphate (P) amendments which could transfer Pb from unstable fraction to stable fraction are commonly used to immobilize Pb in soils and have been extensively studied by researchers during decades. Based on the previous study, it can be concluded that three principal mechanisms may be responsible for P-induced Pb immobilization: 1) the precipitation of Pb-phosphates, including direct precipitation, ion-exchange (or substitution) effect and liming effect; 2) the adsorption of Pb, including the direct adsorption and the adsorption of Pb to iron (hydr)oxides; 3) the rhizosphere effect, including acidification effect and mycorrhizae effect. In this review, these mechanisms have been completely discussed and the internal relationships among them were summarized to give a better understanding of P-induced Pb immobilization in soils and promote the development of P-based remediation technology.