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Effect of photolytic oxalate treatment on soil hydroxy-interlayered vermiculites

Sampath S. Iyengar, Lucian W. Zelazny and David C. Martens
Effect of photolytic oxalate treatment on soil hydroxy-interlayered vermiculites
Clays and Clay Minerals (December 1981) 29 (6): 429-434


The effects of Na-citrate-dithionite (NaCD), ammonium oxalate in the dark (NH (sub 4) Ox-D), and photolytic reaction under ultraviolet radiation (NH (sub 4) Ox-P) on the mineralogy of <2-mu m fractions of selected soils from Virginia were investigated. The NH (sub 4) Ox-D treatment removed the smallest amounts of Al (<0.22%) and Fe (<0.50%) from all soils, indicating low levels of noncrystalline material in these materials. From the six soils examined, NH (sub 4) Ox-P treatment extracted 5-62% more Fe and 12-300% more Al than the NaCD treatment. The NH (sub 4) Ox-D and NaCD treatments revealed no X-ray diffraction detectable alterations to mineral phases present in <2-mu m fractions of these soils. The NH (sub 4) Ox-P treatment, on the other hand, produced considerable degradation of hydroxy-interlayered vermiculites in these soils, as evidenced by a shift of the 14-Aa X-ray diffraction maxima to lower spacings with heat treatment of the sample. The NH (sub 4) Ox-P treatment removed variable amounts of hydroxy-Al material from the interlayers of 2:1 layer silicates, depending on their stability and degree of development.

ISSN: 0009-8604
Serial Title: Clays and Clay Minerals
Serial Volume: 29
Serial Issue: 6
Title: Effect of photolytic oxalate treatment on soil hydroxy-interlayered vermiculites
Affiliation: Va. Polytech. Inst. and State Univ., Agron. Dep., Blacksburg, VA, United States
Pages: 429-434
Published: 198112
Text Language: English
Summary Language: Russian
Summary Language: German
Summary Language: French
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 18
Accession Number: 1982-033632
Categories: Soils
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 anal. 3 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1982
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