A troca de aniônios nos minerais argilosos
Palavras-chave:
troca aniônios, minerais argilosos, fixação fósforo, adsorção aniônios, capacidade trocaResumo
The article is a review article on anion exchange in clay minerals. The main papers about the subject are revised.
It is discussed the inlluences of free iron and aluminum oxides and some pretreatments to which clay minerals are submitted on the results of some anion exchange experiments. The author thinks there is enough evidence accumulated endorsing the recognition of anion exchange as a definite phenomenon in clay minerals. The data examined strongly indicates the hydroxyl groups in clay minerals as the site for anion exchange.
Referências
Coleman, R. The mechanism of phosphate fixation by montmorillonittic and kaolinitic clays. Soil Sci. Soc. Amer. Proc. 9:72 (1944).
Dean, L. A. e Rubins, E. J. Anion exchange in soils. L. Exchangeable phosphorus and the anion exchange capacity. Soil Sci. 63 : 377 (1947).
Demolon, A. e Bastisse, E. Contribution a I’etude de la mechanique chimique des anions dans le sol. Ann. Agron. 4:53 (1934).
Dickman, S. R. e Bray, R. H. Replacement of adsorbed phosphate from kaolinite by fluoride. Soil Sci. 52:263 (1941)
Eresningger, L. IF. e r#ajonship between water lost amid F0J edssetbe on'l Riosshating clay minerals and sotiicedlavids. SS "Soci SSoc , Aer. Proc. 13:171 (1948).
Kelly, J. B. e Midgley, A. R. Phosphate fixation — an exchange of phosphate and hyjxyl ions. Soil Sci 55:167 (1942), iy REA
Kurtz, T., DeTurk, E. E. e Bray, R. H. Phospha‘ ption by Illinois soils. Soil Sci. 61: 111 (1946).
Laws, W. D. e Page, J. B. Changes produced in k linite by dry grinding. Soil Sci. 62:319 (1946).
Low, P. F. e Black, C. A. Phosphate-induced decomposition of kaolinite. Soil Sci. Soc. Amer, Proc. 12:180 (1947).
Mgrshall, C. E. The colloid chemistry of the silicate minerals. Academic Press Inc., New York (1949).
Mattson, S. Laws of soil colloidal behavior. VI. Amphoteric behavior. Suil Sci. 32: 343 (1931).
McAuliffe, C. D. et al. Exchange reaction between phosphate and soils: Hydroxylic surfaces of soil minerals. Soil Sci. Soc. Amer. Proc. 12:119 (1947).
Murphy, H. F. The role of kaolinite in phosphate fixation. Hilgardia 12:343 (1939).
Perkins, A. T. Kaolin and treated kaolins and their reactions. Soil Sci. 65: 185 (1948).
Ravikovitch, S. Anion exchange: I. Liberation of the phosphoric acid ions adsorbed by soils. Soil. Sci. 38:279 (1934).
Scarseth, G. D. The mechanism of phosphate retention by natural alumino-silicate colloids. Jour. Amer. Soc. Agron. 27 : 596 (1935).
Schofield, R. K. The electrical charges on clay particles. Soil and Fert., Imp. Bur. Soil Sci. 2: 1 (1939).
Sieling, D. H. Role of kaolin in anion sorption and exchange. Soil Sci. Soc. Amer. Proc. 11 : 161 (1946).
Stout, P. R. Alterations in the crystal structure of clay minerals as a result of phosphate fixation. Soil Sci. Soc. Amer. Proc. 4:177 (1939).
Toth, S. J. Anion adsorption by soil to changes in free iron oxides. Sail S lloids in relation 1: 44:299 (I920)
