A sequential extraction procedure for acid sulfate soils

Partitioning of iron

Salirian R. Claff, Leigh A. Sullivan, Edward D. Burton, Richard T. Bush

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

A new sequential extraction scheme for acid sulfate soil materials has been evaluated for iron partitioning in a range of synthetic iron-bearing minerals and natural acid sulfate soil materials. This sequential extraction procedure employs six steps to quantify (1) exchangeable (magnesium chloride extractable), (2) acid (hydrochloric acid) soluble, (3) reactive organic-bound (pyrophosphate extractable), (4) crystalline oxide (citrate buffered dithionite (CBD)) extractable, (5) pyrite-bound (nitric acid extractable) and (6) residual (acid/peroxide digestible) forms of iron. Given its intended use for acid sulfate soil materials that frequently contain pyrite, a primary aim of this new sequential extraction procedure was to differentiate iron bound in pyrite from iron contained in other minerals. The results demonstrated that dissolution of pyrite was effectively isolated in the pyrite-bound extraction step, with dissolution of other iron mineral phases (i.e. akaganeite, ferrihydrite, goethite, hematite, jarosite, magnetite, and schwertmannite) occurring within the other five extraction steps. Following a systematic examination of these synthetic iron mineral phases, the sequential extraction scheme was applied to an acid sulfate soil profile, with detailed data presented for two soil layers: one representative of the sulfidic (unoxidised) conditions, and the other sulfuric (oxidised) conditions. Partitioning data for pyrite-bound iron in the acid sulfate soil profile showed good agreement with that calculated via the independently measured pyrite-bound reduced sulfur. This study indicates that the new sequential extraction procedure is suitable for the assessment of iron partitioning in acid sulfate soil materials.

Original languageEnglish
Pages (from-to)224-230
Number of pages7
JournalGeoderma
Volume155
Issue number3-4
DOIs
Publication statusPublished - 2010
Externally publishedYes

Fingerprint

acid sulfate soils
acid sulfate soil
partitioning
iron
pyrite
minerals
mineral
soil profiles
soil profile
akaganeite
dissolution
exchangeable magnesium
schwertmannite
ferrihydrite
magnesium chloride
sequential extraction
magnetite
nitric acid
jarosite
goethite

Cite this

Claff, Salirian R. ; Sullivan, Leigh A. ; Burton, Edward D. ; Bush, Richard T. / A sequential extraction procedure for acid sulfate soils : Partitioning of iron. In: Geoderma. 2010 ; Vol. 155, No. 3-4. pp. 224-230.
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A sequential extraction procedure for acid sulfate soils : Partitioning of iron. / Claff, Salirian R.; Sullivan, Leigh A.; Burton, Edward D.; Bush, Richard T.

In: Geoderma, Vol. 155, No. 3-4, 2010, p. 224-230.

Research output: Contribution to journalArticle

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