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Comparison of functions for evaluating the effect of Fe and Al oxides on the particle size distribution of kaolin and quartz

Published online by Cambridge University Press:  09 July 2018

M. Arias ,
E. Lopez  and
M. T. Barral
M. Arias
Affiliation:
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago, 15706 Santiago de Compostela, Spain
E. Lopez
Affiliation:
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago, 15706 Santiago de Compostela, Spain
M. T. Barral
Affiliation:
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago, 15706 Santiago de Compostela, Spain
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Abstract

Although it is generally agreed that Fe and Al can act to bind soil particles, their relative efficiencies as aggregants are still disputed. In this work, the aggregating efficiencies of both aged and non-aged Fe and Al oxides precipitated on kaolin or quartz substrates were characterized by comparing their effects on particle size distributions (PSD). To facilitate comparison of PSD data, these were parameterized by fitting them with five different probability density functions (the normal, lognormal, Jaky, fractal and Rosin-Rammler functions). The best fits were given by the Rosin-Rammler function (R2 = 0.997), whose α parameter was used to compare the aggregating efficiency of Fe and Al oxides: in order of decreasing efficiency, non-aged Al > non-aged Fe ≈ aged Fe > aged Al-precipitates.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 1 , March 1997 , pp. 3 - 11
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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