Acid release from an acid sulfate soil sample under successive extractions with different extractants

C. Lin; M. M. Islam; R. T. Bush; L. A. Sullivan; M. D. Melville

Acid release from an acid sulfate soil sample under successive extractions with different extractants

C. Lin, M. M. Islam, R. T. Bush, L. A. Sullivan, M. D. Melville

Research output: Contribution to journal › Article

Abstract

An acid sulfate soil sample was successively extracted with deionized water, 1 mol L 1 KC1 and 0.0005 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 KC1 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 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.

Original language	English
Pages (from-to)	221-228
Number of pages	8
Journal	Pedosphere
Volume	10
Issue number	3
Publication status	Published - 2000
Externally published	Yes

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Lin, C., Islam, M. M., Bush, R. T., Sullivan, L. A., & Melville, M. D. (2000). Acid release from an acid sulfate soil sample under successive extractions with different extractants. Pedosphere, 10(3), 221-228.

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title = "Acid release from an acid sulfate soil sample under successive extractions with different extractants",

abstract = "An acid sulfate soil sample was successively extracted with deionized water, 1 mol L 1 KC1 and 0.0005 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 KC1 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 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.",

keywords = "Acid release, Acid sulfate soil, Successive extraction",

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T1 - Acid release from an acid sulfate soil sample under successive extractions with different extractants

AU - Lin, C.

AU - Islam, M. M.

AU - Bush, R. T.

AU - Sullivan, L. A.

AU - Melville, M. D.

PY - 2000

Y1 - 2000

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AB - An acid sulfate soil sample was successively extracted with deionized water, 1 mol L 1 KC1 and 0.0005 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 KC1 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 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.

KW - Acid release

KW - Acid sulfate soil

KW - Successive extraction

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