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Effect of Photolytic Oxalate Treatment on Soil Hydroxy-Interlayered Vermiculites

Published online by Cambridge University Press:  01 July 2024

Sampath S. Iyengar ,
Lucian W. Zelazny  and
David C. Martens
Sampath S. Iyengar*
Affiliation:
Agronomy Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
Lucian W. Zelazny
Affiliation:
Agronomy Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
David C. Martens
Affiliation:
Agronomy Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
*
1Present address: D'Appolonia Consulting Engineers, Inc., Pittsburgh, Pennsylvania 15235.
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Abstract

The effects of Na-citrate-dithionite (NaCD), ammonium oxalate in the dark (NH4Ox-D), and photolytic reaction under ultraviolet radiation (NH4Ox-P) on the mineralogy of <2-µm fractions of selected soils from Virginia were investigated. The NH4Ox-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, NH4Ox-P treatment extracted 5–62% more Fe and 12–300% more Al than the NaCD treatment. The NH4Ox-D and NaCD treatments revealed no X-ray diffraction detectable alterations to mineral phases present in <2-µm fractions of these soils. The NH4Ox-P treatment, on the other hand, produced considerable degradation of hydroxy-interlayered vermiculites in these soils, as evidenced by a shift of the 14-Å X-ray diffraction maxima to lower spacings with heat treatment of the sample. The NH4Ox-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.

Резюме

Резюме

Исследовались эффекты Na-цитратного-дитионита (NaCD), оксалата аммония в темноте (NH4Ox-D) и фотолитическая реакция в ультрафиолетовом излучении (NH4Ox-P) на минералогию фракций размером <2 μм избранных почв Виргинии. Обработка NH4Ox-D удалила самые маленькие количества Аl (<0,22%) и Fe (<0,50%) из всех почв, указывая на низкий уровень некристаллического материала в этих почвах. Обработка NH4Ox-P удалила от 5 до 62% более Fe и от 12 до 300% более Аl, чем обработка NaCD из шести исследованных почв. После обработки NH4Ox-D и NaCD не было никаких измеряемых рентгеновской дифракцией фазовых перемен во фракциях этих почв размером <2 μм. Обработка NH4Ox-P, с другой стороны, вызвала значительную деградацию гидрокси-межслойных вермикулитов в этих почвах, на что указывал сдвиг 14 Å максимума рентгеновской дифракции в сторону меньших расстояний после тепловой обработки образца. Обработка NH4Ox-P удаляла разные количества гидрокси-Аl материала из прослоек 2:1 силикатов в зависимости от их стабильности и степени процесса образования. [Е.С.]

Resümee

Resümee

Es wurden die Auswirkungen von Na-Citrat-Dithionit (NaCD), sowie die von Ammoniumoxalat im Dunkeln (NH4Ox-D) und bei der photolytischen Reaktion unter ultravioletter Bestrahlung (NH4Ox-P) auf die Mineralogie der Fraktion <2 μm von ausgewählten Böden aus Virginia untersucht. Die NH4Ox-D-Behandlung enttemte aus allen Böden die geringsten Mengen von Al (<0,22%) und Fe (<0,50%), was auf niedrige Gehalte an nichtkristallinem Material in diesen Substanzen hindeutet. Aus sechs untersuchten Böden extrahierte die NH4Ox-P-Behandlung 5-62% mehr Fe und 12–300% mehr Al als die NaCD-Behandlung. Die NH4Ox-D- und die NaCD-Behandlungen verursachten keine mit Röntgendiffraktion erkennbaren Veränderungen an den Mineralphasen in den Fraktionen <2 μm dieser Böden. Die NH4Ox-P- Behandlung verursachte dagegen in diesen Böden eine beachtliche Degradation der Vermiculite mit Hydroxy-Zwischenlagen, wie aus einer Verschiebung des 14 Å Maximums der Röntgendiffraktion nach kleineren Werten bei Erhitzen der Probe hervorging. Die NH4Ox-P-Behandlung entfernte unterschiedliche Mengen an Hydroxy-Al-Material aus den Zwischenschichten der 2:1 Schichtsilikate in Abhängigkeit von ihrer Stabilität und ihrem Kirstallisationsgrad. [U.W.]

Résumé

Résumé

Les effets de la citrate-dithionite-Na (NaCD), ammonium oxalate, dans le noir (NH4Ox-D) et la réaction photolytique sous radiation ultraviolette (NH4Ox-P) sur la minéralogie de fractions <2-μm de sols sélectionnés de Virginie, ont été investigués. Le traitement au NH4Ox-D a enlevé les plus petites quantités d'Al (<0,22%) et de Fe (<0,50%) de tous les sols, indiquant de bas niveaux de matériel non-cristallin dans ces matériaux. Dans les six sols examinés, le traitement au NH4Ox-P a extrait de 5–62% plus de Fe et de 12–300% plus d'Al que le traitement au NH4Ox-D. Les traitements au NH4Ox-D et au NaCD n'ont révélé aucune altération détectible à la diffraction aux rayons-X des phases minérales présentes dans les fractions <2-μm dans ces sols. Le traitement au NH4Ox-P, d'un autre côté, a produit une dégradation considérable des vermiculites à intercouches hydroxy dans ces sols, mise en évidence par un déplacement des maxima 14 Å de la diffraction aux rayons-X à des espacements plus bas, avec traitement de l’échantillon à la chaleur. Le traitement NH4Ox-P a retiré des quantités variables de matériel Al-hydroxy des intercouches silicates à couches 2:1, dépendant de leur stabilité et de leur degré de développement. [D.J.]

Keywords

Hydroxy-interlayerIron oxideNoncrystallineOxalate extractionPhotolytic reactionSoilVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 29 , Issue 6 , December 1981 , pp. 429 - 434
Copyright
Copyright © 1981, The Clay Minerals Society

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References

Allison, L. E. and Black, C. A., (1965) Total carbon Methods of Soil Analysis Wisconsin American Society of Agronomy, Madison 1346–1365.Google Scholar
Arshad, M A St Arnaud, R. J. and Huang, P. M., (1972) Dissolution of trioctahedral layer silicates by ammonium oxalate, sodium dithionite-citrate-bicarbonate, and potassium pyrophosphate Can. J. Soil Sci. 52 19–26.CrossRefGoogle Scholar
Chao, T. T. and Theobald, P K Jr, (1976) The significance of secondary iron and manganese oxides in geochemical exploration Econ. Geol. 71 1560–1569.CrossRefGoogle Scholar
Coffin, D. E., (1963) A method for the determination of free iron in soils and clays Can. J. Soil Sci. 43 7–17.CrossRefGoogle Scholar
Day, P. R. and Black, C. A., (1965) Particle size fraction and particle size analysis Methods of Soil Analysis Wisconsin American Soc. Agronomy, Madison 545–567.Google Scholar
DeEndredy, A. S., (1963) Estimation of free iron oxides in soils and clays by a photolytic method Clay Miner. Bull. 9 209–217.CrossRefGoogle Scholar
Drever, J. I., (1973) The preparation of oriented clay mineral specimens for X-ray diffraction analysis by a filter-membrane peel technique Amer. Mineral. 58 553–554.Google Scholar
Hodges, S. C. and Zelazny, L. W., (1980) Determination of noncrystalline soil components by weight difference after selective dissolution Clays & Clay Minerals 28 35–42.CrossRefGoogle Scholar
LeRiche, H. H. and Weir, A. H., (1963) A method for studying trace elements in soil fractions J. Soil Sci. 14 225–235.CrossRefGoogle Scholar
McKeague, J. A. and Day, J. H., (1966) Dithionite- and oxalate-extractable Fe and A1 as aids in differentiating various classes of soils Can. J. Soil Sci. 46 13–22.CrossRefGoogle Scholar
McKeague, J. A. Brydon, J. E. and Miles, N. M., (1971) Differentiation of forms of extractable iron and aluminum in soils Soil Sci. Soc. Amer. Proc. 35 33–38.CrossRefGoogle Scholar
McLaren, R. G. and Crawford, D. V., (1973) Studies on soil copper: I. Fractionation of copper in soils J. Soil Sci. 24 172–181.CrossRefGoogle Scholar
Mehra, O. P. Jackson, M. L. and Swineford, A., (1960) Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate Clays and Clay Minerals, Proc. 7th Natl. Conf, Washington, D.C., 1958 New York Pergamon Press 317–327.Google Scholar
Meyers, N. L. Ahlrichs, J. L. and Serratosa, J. M., (1973) Correlation of X-ray, IR, DTA, DTGA and CEC observations on Al-hydroxy interlayers Proc. Int. Clay Conf, Madrid, 1972 Madrid Div. Ciencias C.S.I.C. 243–254.Google Scholar
Pawluk, S., (1972) Measurement of crystalline and amorphous iron removal in soils Can. J. Soil Sci. 52 119–123.CrossRefGoogle Scholar
Rich, C. E., (1968) Hydroxy interlayers in expansible layer silicates Clays & Clay Minerals 16 119–123.CrossRefGoogle Scholar
Schwertmann, U., (1959) Die fraktionierte Extraktion der freien Eisenoxide in Böden, ihre mineralogischen Formen und ihre Entstehungsweisen Z. Pflanzenernaehr. Dueng. Bodenk. 84 194–204.CrossRefGoogle Scholar
Schwertmann, U., (1964) Differenzierung der Eisenoxide des Bodens durch photochemische Extraktion mit saurer Ammoniumoxalat-Lösung Z. Pflanzenernaehr. Dueng. Bodenk. 105 194–202.CrossRefGoogle Scholar