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Hysteresis in the individual and competitive sorption of cadmium, copper, and lead by various soil horizons

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Abstract.
Investigations of the sorption of heavy metals by soils often involve a fast ion-exchange process followed
by a more sorbate-specific slow process. Desorption and sorption isotherms often fail to coincide, thus
showing real or artifactual hysteresis, and failure to conform to conventional models generally prevents
meaningful comparison of the hysteretic behavior of different sorbates in different soils. In the work
described here, the irreversibility of the sorption of Cd, Cu, and Pb from single-metal and multimetal
solutions by samples of 20 soil horizons was evaluated in terms of a hysteresis index, defined as the ratio
between the values obtained in desorption and sorption experiments for an affinity measure defined in
previous work, Kr. Sorption of these metals from both types of solution was more irreversible in the
more basic soils, and its other chief determinants were CICe, Mn oxides content, and, except for Cd,
organic matter content. The least sorbed metal was invariably Cd.

Keywords:
Soil
Sorption
Hysteresis
Cd
Cu
Pb
Single- and multimetal solutions

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 331 (2009) 312–317

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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