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Membrane Electrodes for Studying the Interaction of Humic Acids with Heavy Metals: Cu(II), Pb(II), Cd(II), and U(VI)
Author(s) -
Ghantous Louis,
Lojou Elisabeth,
Bianco Pierre
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199812)10:18<1249::aid-elan1249>3.0.co;2-f
Subject(s) - chemistry , membrane , humic acid , electrochemistry , inorganic chemistry , electrode , metal , metal ions in aqueous solution , carbon fibers , organic chemistry , materials science , biochemistry , fertilizer , composite number , composite material
A new strategy for studying the incorporation process of metal cations in humic acids, based on the use of membrane‐carbon electrodes is described. Humic acids (HA) are entrapped between the membrane and the carbon surface, while freely diffusing cations are present in the electrochemical cell. In a first part, the response of the membrane electrode is characterized in the case of Ru(NH 3 ) 6 3+ as a cation model. Voltammetric responses are evaluated with respect to several experimental factors such as HA concentration and pH. The efficiency of membrane HA‐modified electrode is then evaluated by studying the accumulation of UO 2 2+ at pH 5.1. The effect of clay within the HA‐filling on the incorporation of UO 2 2+ is also examined. The extend of the incorporation of Tl + , Pb 2+ , Cd 2+ , Cu 2+ , Cu(NH 3 ) 4 2+ , and of methylviologen, an organic cation of environment involvement is investigated. The interest of the membrane HA‐modified electrode to get insights into the interaction of humic substances with metal cations is demonstrated.