Summary
Silica was separated from the oat plant by wet-way ashing and by dry-way ashing, examined under the petrological microscope and analyzed by chemical, X-ray and thermal techniques. Surface areas were also determined.
Silica separated by wet-way ashing is representative of the solid silica of the plant. It is entirely opal with refractive index (nNa) ranging from 1.427 to 1.440 and surface area of 14.4 m2/g.
Dry-way ashing produced changes in the silica of the plant. Much greater amounts of Na, K, Ca, Mg, Mn, and Fe were combined in insoluble forms with accompanying changes in the physical properties of the silica. The most notable of these were the crystallization of a small proportion of opal to cristobalite, an increase in refractive index, and a large decrease in surface area.
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References
Baker, G., Opal phytoliths in some Victorian Soils and “red rain” residues. Australian J. Botany7, 64–87 (1959).
Baker, G., A contrast in the opal phytolith assemblages of two Victorian soils. Australian J. Botany7, 88–96 (1959).
Baker, G., Hook-shaped opal phytoliths in the epidermal cells of oats. Australian J. Botany8, 69–74 (1960).
Baker, G., Jones, L. H. P., and Wardrop, I. D., Opal phytoliths and mineral particles in the rumen of the sheep. Australian J. Agr. Research12, 462–472 (1961).
Beavers, A. H. and Stephen, I., Some features of the distribution of plant opal in Illinois soils. Soil Sci.86, 1–5 (1958).
Florke, O. W., Zur Frage des “Hoch” — Cristobalit in Opalen, Bentoniten und Glasern. Neues Jahrb. Mineral. Monathsh.10, 217–223v (1955).
Franks, P. C. and Swineford, A., Character and genesis of massive opal in Kimball Member, Ogallala formation, Scott County, Kansas. J. Sediment. Petrol.29, 186–196 (1959).
Hill, G. V. and Roy, R., Silica structure studies VI. On tridymites. Trans. Brit. Ceram. Soc.57, 496–510 (1958).
Kanno, I. and Arimura, S., Plant opal in Japanese soils. Soil and Plant Food (Tokyo)4, 62–67 (1958).
Konta, J., Voda v nerostech. Sborník ústred. ústavu geol.19, 137–152 (1952).
Lanning, F. C., Ponnaiya, B. W. X., and Crumpton, C. F., The chemical nature of silica in plants. Plant Physiol.33, 339–343 (1958).
Lanning, F. C., Nature and distribution of silica in strawberry plants. Proc. Am. Soc. Hort. Sci.76, 349–358 (1960).
Lanning, F. C., Silica and calcium in black raspberries. Proc. Am. Soc. Hort. Sci.77, 367–371 (1961).
Methods of Analysis of the Association of Official Agricultural Chemists. 9th Ed., A.O.A.C., Washington, D.C. (1960).
Papailhav, J., Sur le formation par chauffage de tridymite et cristabolite du silice amorphe precipitée. Compt. rend.245, 1443–1445 (1957).
Parry, D. W. and Smithson, F., Detection of opaline silica in grass leaves. Nature179, 975–976 (1957).
Parry, D. W. and Smithson, F., Techniques for studying opaline silica in grass leaves. Ann. Botany22, 543–549 (1958).
Piper, C. S., The use of perchloric acid in the digestion of plant materials. Australian Chem. Inst. J. and Proc.6, 421–427 (1939).
Piper, C. S., Soil and Plant Analysis. 1st Ed. The University of Adelaide, Adelaide (1942) and Interscience Publishers Inc., New York (1950).
Smithson, F., Plant Opal in soil. Nature178, 107 (1956).
Smithson, F., Grass opal in British soils. J. Soil Sci.9, 148–154 (1958).
Yoshida, S., Onishi, Y., and Kitagishi, K., The chemical nature of silicon in rice plant. Soil and Plant Food (Tokyo)5, 23–27 (1959).
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Jones, L.H.P., Milne, A.A. Studies of silica in the oat plant. Plant Soil 18, 207–220 (1963). https://doi.org/10.1007/BF01347875
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DOI: https://doi.org/10.1007/BF01347875