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Distribution of Major Cations in Estuarine Sediments

Published online by Cambridge University Press:  01 July 2024

A. S. Parashiva Murthy  and
R. E. Ferrell Jr.
A. S. Parashiva Murthy
Affiliation:
Department of Geology, Louisiana State University, Baton Rouge, Louisiana 70803, U.S.A.
R. E. Ferrell Jr.
Affiliation:
Department of Geology, Louisiana State University, Baton Rouge, Louisiana 70803, U.S.A.
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Abstract

This paper reports the measured distribution of major cations in interstitial, exchangeable and non-exchangeable phases of estuarine sediments. The observed changes in ionic ratios result from the valence and dilution effects in the Donnan equilibrium concept according to which the ion exchanger favors the sorption of divalent ions at the expense of monovalent cations and cations migrate to the outer solution. The above findings have direct application to an interpretation of diagenetic changes in clay minerals.

Résumé

Résumé

Cet article décrit la distribution des cations majeurs que l’on peut mesurer dans les phases interstitielles, échangeables et non échangeables des sédiments d’estuaires. Les variations observées dans les rapports ioniques proviennent des effets de valence et de dilution, en utilisant le concept de l’équilibre de Donnan, selon lequel l’échangeur d’ions favorise la fixation des ions divalents aux dépens des cations monovalents et des cations qui migrent dans la solution extérieure. Les résultats précités ont une application directe dans l’interprétation des modifications diagénétiques des minéraux argileux.

Kurzreferat

Kurzreferat

Die Arbeit berichtet über die in Flußmündungssedimenten gemessene Verteilung der wichtigsten Kationen auf Porenlösung sowie austauschbare und nichtaustauschbare Form. Die beobachteten Veränderungen der Ionenverhältnisse sind das Ergebnis von Wertigkeits- und Verdünnungseffekten im Sinne des Donnan-Gleichgewichtes. Sie haben zur Folge, daß der Austauscher 2 wertige Kationen auf Kosten der einwertigen bevorzugt sorbiert, und daß Kationen in die Außenlösung übergehen. Die dargestellten Ergebnisse haben einen direkten Bezug zur Deutung diagenetischer Veränderungen in Tonmineralen.

Резюме

Резюме

В этой работе излагается измеренное распределение главных катионов во внедренных, обменных и необменных фазах эстуарийных отложений. Изменения замеченные в ионных отношениях происходят вследствие эффектов валентности и разбавления по концепции равновесия Доннана, согласно которой ионный обмен способствует сорбции дивалентных ионов за счет моновалентных катионов и катионы мигрируют во внешний раствор. Данные полученные выше можно применять непосредственно к интерпретации диагенетических изменений в глинистых минералах.

Type
Research Article
Information
Clays and Clay Minerals , Volume 21 , Issue 3 , June 1973 , pp. 161 - 165
Copyright
Copyright © 1973 The Clay Minerals Society

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