| 不同提取剂连续提取下某酸性硫酸盐土壤酸的释放 |
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| 引用本文： | C. LIN,M. M. ISLAM,R. T. BUSH,L. A. SULLIVAN,M. D. MELVILLE. 不同提取剂连续提取下某酸性硫酸盐土壤酸的释放[J]. 土壤圈, 2000, 10(3): 221-228 |
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| 作者姓名： | C. LIN M. M. ISLAM R. T. BUSH L. A. SULLIVAN M. D. MELVILLE |
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| 作者单位： | [1]CentreforAcidSulfateSoilResearch,SouthernCrossUniversity,NSW2480,Australia [2]SchoolofGeography,TheUniversityofNewSouthWales,Sydney,NSW2052,Australia |
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| 基金项目： | *Project partly supported by a grant from Australian Research Council. |
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| 摘 要： | An acid sulfate soil sample was successively extracted with deionized water,1 molL^-1 KCl and 0.0005mol L^-1 Ca(OH)2 solutions.The results showed that only very small amounts of acidity were extracted by deionized water,possibly through slow jarosite hydrolysis.Acid release through jarosite hydrolysis was greatly enhanced by Ca(OH)2 extraction at the expense of the added OH^- being neutralized by the acid released.Successive extration of the sample with KCl removed the largest amounts of acidity from the sample.However,it is likely that the major form of acidity released by KCl extraction was exchangeable acidity.The results also show the occurrence of low or non charged Al and Fe species in water and Ca(OH)2 extracts after first a few extractions .It appears that such a phenomenon was related to a decreasing EC value with increasing number of extractions.
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| 关 键 词： | 酸性土壤 硫酸盐 氯化钾 铅 铁 氢氧化钙 去离子水 导电率 |
Acid release from an acid sulfate soil sample under successive extractions with different extractants |
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| C. LIN,M. M. ISLAM,R. T. BUSH,L. A. SULLIVAN and M. D. MELVILLE. Acid release from an acid sulfate soil sample under successive extractions with different extractants[J]. Pedosphere, 2000, 10(3): 221-228 |
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| Authors: | C. LIN M. M. ISLAM R. T. BUSH L. A. SULLIVAN M. D. MELVILLE |
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| Affiliation: | [1]CentreforAcidSulfateSoilResearch,SouthernCrossUniversity,NSW2480,Australia [2]SchoolofGeography,TheUniversityofNewSouthWales,Sydney,NSW2052,Australia |
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| Abstract: | An acid sulfate soil sample was successively extracted with deionized water, 1 mol L-1 KCI and 0.000 5 mol L-1 Ca(OH)2 solutions. The results showed that only very small amounts of acidity were extracted by deionized water, possibly through slow jarosite hydrolysis. Acid release through jarosite hydrolysis was greatly enhanced by Ca(OH)2 extraction at the expense of the added OH- being neutralized by the acid released. Successive extraction of the sample with KCI removed the largest amounts of acidity from the sample. However, it is likely that the major form of acidity released by KC1 extraction was exchangeable acidity. The results also show the occurrence of low or non charged A1 and Fe species in water and Ca(OH)2 extracts after first a few extractions. It appears that such a phenomenon was related to a decreasing EC value with increasing number of extractions. |
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| Keywords: | acid release acid sulfate soil successive extraction |
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