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Dissolution of Smectites in Hydrochloric Acid: II. Dissolution Rate as a Function of Crystallochemical Composition

Published online by Cambridge University Press:  01 July 2024

I. Novák  and
B. Číčel
I. Novák
Affiliation:
Institute of Inorganic Chemistry, Slovak Acad. Sci., 809 34 Bratislava, Czechoslovakia
B. Číčel
Affiliation:
Institute of Inorganic Chemistry, Slovak Acad. Sci., 809 34 Bratislava, Czechoslovakia
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Abstract

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A correlation was made of crystallochemical data from 15 smectites with the half time of dissolution (t05) in 6 N hydrochloric acid at 96°C. From this the relation

ln t05 = 3.95 - 1.96 FeVI - 2.30 MgVI

was developed. It shows a remarkable dependence of the apparent dissolution rate of the octahedral layer of the smectites on the substitution of Fe3+ and Mg2+ for Al+3 in the octahedral position.

Резюме

Резюме

Было проведено изучение корреляционной зависимости между кристалло-химическими данными 15 образцов смектита и половиной времени их растворения (t05) в 6N соляной кислоте при 9б°С. Отсюда было получено следующее соотношение: ln t05=3.95-1.96FeVI-2.30 MgVI. Оно показывает примечательную зависимость удельной скорости растворения октаэдрического слоя смектитов от замещения Al+3 катионами Fe3+ и Mg2+ в октаэдрической позиции.

Kurzreferat

Kurzreferat

Eine Korrelation kristallchemischer Daten von 15 Smektiten mit den Halbwertszeiten der Auflösung (t05) in 6N HCl bei 96°C wurde aufge-stellt. Daraus wurde die Gleichung: ln t05=3,95-1,96 FeVI-2,30 MgVI abgeleitet. Es zeigte sich eine bemerkenswerte Abhängigkeit der scheinbaren Auflösungsrate der oktahedrischen Schicht der Smektiten von der Substitution von Fe(III) und Mg(II) für Al(III) in der oktahedrischen Position.

Résumé

Résumé

Une corrélation a été établie entre les données cristallochimiques de quinze smectites ayant un demi-temps de dissolution(t05) dans l'acide hydrochlorique 6N à 96°C.La relation suivante a été développée: ln t05=3.95-1.96 FeVI-2.30 MgVI

Elle montre une dépendance remarquable de la vitesse apparente de dissolution du feuillet octaèdral des smectites de la substitution de Fe3+ et Mg2+ à Al+3 dans la position octaèdrale.

Keywords

CrystallochemicalDissolutionHydrochloricNontroniteSmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 26 , Issue 5 , October 1978 , pp. 341 - 344
Copyright
Copyright © 1978, The Clay Minerals Society

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