| Titratable Acidity and Alkalinity of Red Soil Surfaces |
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| 引用本文： | SHAO ZONG-CHEN,HE QUN,WANG WEI-JUN. Titratable Acidity and Alkalinity of Red Soil Surfaces[J]. 土壤圈, 1993, 3(2): 107-117 |
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| 作者姓名： | SHAO ZONG-CHEN HE QUN WANG WEI-JUN |
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| 作者单位： | Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008;Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008;Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 |
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| 基金项目： | Project supported by the National Natural Science Foundation of China. |
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| 摘 要： | The surfaces of red soils have an apparent amphotenc character, carrying titratable acidity and titratable alkalinity simultaneously. The titratable acidity arises from deprotonation of hydroxyl groups of hydrous oxide-type surfaces and dissociation of weak-acid functional groups of soil organic matter, while the titratable alkalinity is derived from release of hydroxyl groups of hydrous oxide-type surfaces. The titratable acidity and titratable alkalinity mainly depended on the composition and content of iron and aluminum oxides in the soils. The results showed that the titratable acidity and titratable alkalinity were in significantly positive correlation not only with the content of amorphous aluminum oxide(Alo) and iron oxide(Feo) extracted with acid ammonium oxalate solution, free iron ox-ide(Fed) extracted with sodium dithionite-citrate-bicarbonate (DCB) and clays, but also with the zero point of charge (ZPC) of the samples. Organic matter made an important contribution to the titratable acidity.
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| 关 键 词： | 红壤 可滴定酸度 可滴定碱度 表面电荷 氟化物 吸附作用 |
Titratable Acidity and Alkalinity of Red Soil Surfaces |
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| SHAO ZONG-CHEN,HE QUN and WANG WEI-JUN. Titratable Acidity and Alkalinity of Red Soil Surfaces[J]. Pedosphere, 1993, 3(2): 107-117 |
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| Authors: | SHAO ZONG-CHEN HE QUN WANG WEI-JUN |
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| Affiliation: | Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008;Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008;Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 |
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| Abstract: | The surfaces of red soils have an apparent amphotenc character, carrying titratable acidity and titratable alkalinity simultaneously. The titratable acidity arises from deprotonation of hydroxyl groups of hydrous oxide-type surfaces and dissociation of weak-acid functional groups of soil organic matter, while the titratable alkalinity is derived from release of hydroxyl groups of hydrous oxide-type surfaces. The titratable acidity and titratable alkalinity mainly depended on the composition and content of iron and aluminum oxides in the soils. The results showed that the titratable acidity and titratable alkalinity were in significantly positive correlation not only with the content of amorphous aluminum oxide(Alo) and iron oxide(Feo) extracted with acid ammonium oxalate solution, free iron ox-ide(Fed) extracted with sodium dithionite-citrate-bicarbonate (DCB) and clays, but also with the zero point of charge (ZPC) of the samples. Organic matter made an important contribution to the titratable acidity. |
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