Influence of natural organic matter on the adsorption of metal ion onto clay particles

Environmental Science & Technology
By: , and 

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Abstract

The influence of natural organic matter (NOM) on the adsorption of Al, Fe, Zn, and Pb onto clay minerals was investigated. Adsorption experiments were carried out at pH = 5 and pH = 7 in the presence and absence of NOM. In general, the presence of NOM decreased the adsorption of metal ions onto the clay particles. Al and Fe were strongly influenced by NOM, whereas Zn and Pb adsorption was only slightly altered. The interaction of the metal ions with the minerals and the influence of NOM on this interaction was investigated by coupling SdFFF with an inductively coupled plasma mass spectrometer (ICPMS) or an inductively coupled plasma atomic emission spectrometer (ICPAES). Quantitative atomization of the clay particles in the ICP was confirmed by comparing elemental content determined by direct injection of the clay into the ICPMS with values from acid digestion. Particle sizes of the clays were found to be between 0.1 and 1 μm by sedimentation field-flow fractionation (SdFFF) with UV detection. Aggregation of particles due to metal adsorption was observed using SdFFF-ICPMS measurements. This aggregation was dependent on the specific metal ion and decreased in the presence of NOM and at higher pH value.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Influence of natural organic matter on the adsorption of metal ion onto clay particles
Series title Environmental Science & Technology
DOI 10.1021/es010271p
Volume 36
Issue 13
Year Published 2002
Language English
Publisher American Chemical Society
Contributing office(s) Toxic Substances Hydrology Program
Description 7 p.
First page 2932
Last page 2938
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