电位滴定法研究可变电荷土壤表面酸碱性质的进展
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X53

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国家自然科学基金项目(42077016,41877038)及广东省'珠江人才计划'本土创新科研团队项目(2017BT01Z176)资助


Research Progress on the Acid-base Properties of Variable Charge Soils Using Potentiometric Titration
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Supported by the National Natural Science Foundation of China (Nos.42077016 and 4187703) and the Local Innovative and Research Teams Project of the Guangdong Pearl River Talents Program of China (No. 2017BT01Z176)

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    摘要:

    我国长江以南地区的土壤富含铁铝氧化物,其土壤胶体表面电荷具有可变性,显著不同于温带地区的恒电荷土壤,因而称之为可变电荷土壤。开展可变电荷土壤的表面特性研究对农业可持续发展、土壤资源保护等均具有重要的现实意义。电位滴定法是开展可变电荷土壤表面特性研究最直接有效的方法。本文首先总结了电位滴定法的实验条件设置对可变电荷土壤表观电荷零点的影响,在此基础上,归纳了应用电位滴定法结合表面络合模型开展可变电荷土壤酸碱特性的研究进展,分类讨论了黏土矿物组成、氧化物、有机质等相关影响因子对可变电荷土壤酸碱缓冲能力的影响,并展望可变电荷土壤表面酸碱缓冲能力的未来研究。本文将有助于初学者理解可变电荷土壤,呼吁更多学者关注可变电荷土壤的酸碱缓冲特性研究及其在土壤资源可持续利用中所起的重要作用。

    Abstract:

    Compared with the constant charge soils that distribute in temperate regions, the variable charge soils in tropical and subtropical zones are unique soils, with highly variable particle surface charges. Investigations on the surface chemical characteristics of variable charge soils have received considerable attentions. The potentiometric acid-base titration method is the most straightforward approach to qualitatively and quantitatively identify the surface chemical characteristics of variable charge soils. In this paper, the characteristics of variable charge soils are briefly described and the concept and difference of point of zero charge (PZC) is described and classified according to (i) the conditions for surface charge measurement, (ii) the modes of expression for PZC, and (iii) measurement methods for surface charge of soil colloidal particles. On this basis, the influence of the acid-base potentiometric titration setup conditions on the observed PZC, including co-existing ions, ionic strength of the solution, pre-equilibrium time, titration ranges, reaction atmosphere and titration method, is summarized and discussed. Furthermore, the research progresses on the application of potentiometric titration combined with surface complexation model (SCM, including diffuse layer model, basic stern model, triple layer model and distribution multi-site complexity and so on) to analyze the acid-base buffering capacity of variable charge soils were further summarized. Moreover, how related factors such as clay mineral composition, metal oxides, organic matter and other factors, affect the acid-base buffering capacity of variable charge soils are discussed. We believe that future studies on the variable charge soils could be carried out with the hope to:(1) establish a typical acid-base potentiometric titration method for all types of soils; and (2) verify if the combination of various surface complexation models could accurately quantify the acid-base buffer capacity of variable charge soils. It is hoped that this review can help soil science beginners to understand the basic concepts of variable charge soils, invite more researchers to pay more attentions to variable charge soils, and further encourage sustainable utilization of soil resources.

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温晓翠,李九玉,宋洁,陶亮.电位滴定法研究可变电荷土壤表面酸碱性质的进展[J].土壤学报,2022,59(4):910-923. DOI:10.11766/trxb202010090558 WEN Xiaocui, LI Jiuyu, SONG Jie, TAO Liang. Research Progress on the Acid-base Properties of Variable Charge Soils Using Potentiometric Titration[J]. Acta Pedologica Sinica,2022,59(4):910-923.

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