Surface charge properties of variable charge soils influenced by environmental factors
Surface charge properties of variable charge soils influenced by environmental factors
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环境因素对变电荷土壤表面电荷特性的影响
DOI：
10.1016/j.clay.2020.105522
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发表时间：
2020-05
影响因子：
5.6
通讯作者：
Liang Tao
中科院分区：
文献类型：
--
作者：
Xiaocui Wen;Ying Wang;Pengfei Cheng;Dong Liu;Siqi Ma;Chenrui Zhang;Tongxu Liu;Liang Tao
热带和亚热带地区形成的变荷性土壤与欧洲和北美地区形成的定荷性土壤相比具有独特的特点，特别是变荷性土壤颗粒表面电荷对环境因子的敏感性。为了避免副反应的干扰，本研究在非平衡条件下采用快速电位酸碱滴定法进行了实验，并通过表面络合模型进行了模拟，研究了环境因素的影响，包括CO2（氮/空气）的影响、不同离子强度的影响、干湿旋转（不同土液比）的影响、以及季节温度变化（不同反应温度）对华南典型变电荷土壤表面酸度常数和质子化/去质子化过程的影响。滴定结果表明，当表面电荷为零（pHQ=0）时，观察到的表观pH值在空气中发生了显著的负移，S/L比、反应温度与pHQ=0之间存在负相关关系。快速滴定的模拟结果证明，S/L比的改变改变了土壤表面的物质浓度（≡SOH、≡SOH2+和≡SO−），进一步影响了土壤表面电荷性质的改变。同时，温度的升高不仅使土壤表面物种浓度增加，而且使质子化/去质子化处理范围扩大，从而增加了土壤的酸碱缓冲能力。综上所述，这些结果可以帮助我们进一步了解变负荷土壤，特别是中国南方地区土壤的自然酸化过程。
The variable charge soils that have been developed in tropical and subtropical zones are unique soils compared with the constant charge soils that have been developed in Europe and North America, especially the sensitivity of the particle surface charges to environmental factors in the variable charge soils. In this study, to avoid the interference of side reactions, experiments were performed using a fast potentiometric acid-base titration under non-equilibrium condition, and simulation by the surface complexation model to investigate the effects of environmental factors, including the impact of CO2(in nitrogen/in air), the impact of different ionic strengths, the impact of dry-wet rotation (different soil-to-liquid (S/L) ratios), and the impact of seasonal temperature variation (different reaction temperatures), on the surface acidity constants and on the protonation/deprotonation processes in a typical variable charge soil collected in southern China. The titration results demonstrate that the observed measured apparent pH when surface charge equal to zero (pHQ=0) were significantly negative shifted in air, and negative correlations were proven between the S/L ratios, the reaction temperatures and the observed pHQ=0values. The simulation results from the fast titration prove that changing the S/L ratios modifies the surface species concentration (≡SOH, ≡SOH2+, and ≡SO−), further influencing the modification of the surface charge properties of the soil. Meanwhile, an increase in temperature not only increases the amount of the surface species concentration but also causes an enlargement of the protonation/deprotonation processing range, which may increase the acid-base buffer capacity of soils. Taken together, these results can help us to further understand the natural soil acidification processes occurring in variable charge soils, especially in the southern areas of China.
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影响因子：
1.8
作者：
J. Lyklema
通讯作者：
J. Lyklema
影响因子：
9.9
作者：
M. Cea;J. Seaman;Alejandra A. Jara;M. Mora;M. C. Diez
通讯作者：
M. Cea;J. Seaman;Alejandra A. Jara;M. Mora;M. C. Diez
影响因子：
2.2
作者：
C. Su;D. Suarez
通讯作者：
C. Su;D. Suarez
DOI：
10.2136/sssaj1992.03615995005600050017x
发表时间：
1992-09
影响因子：
2.9
作者：
S. Anderson;G. Sposito
通讯作者：
S. Anderson;G. Sposito
影响因子：
5.6
作者：
Benjamin S Ponto;J. Berg
通讯作者：
Benjamin S Ponto;J. Berg