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Determination of aluminum ions by indirect potentiometry in a flow system
Author(s) -
Ngila J. Catherine,
Alexander Peter W.,
Hibbert D. Brynn
Publication year - 1994
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/elan.1140061112
Subject(s) - reagent , fluoride , chemistry , potentiometric titration , ion , aluminium , buffer solution , electrode , volumetric flow rate , inorganic chemistry , analytical chemistry (journal) , buffer (optical fiber) , relative standard deviation , detection limit , chromatography , telecommunications , physics , organic chemistry , computer science , quantum mechanics
A potentiometric system is described for the indirect flow determination of Al 3+ with an aluminum wire as indicator electrode. The method is based on the reaction between aluminum and fluoride ions at pH 5.0 in acetate buffer. The reduction in activity of fluoride ions is detected by the aluminum electrode. The response was optimized for the flow rate of solution, length of reaction tubing, concentration of fluoride reagent, and pH of the buffer. The response was linear with concentration of aluminum in the range of 0.5 to 50 ppm with a relative standard deviation (RSD) of 0.7%. There was negligible interference from a range of cations and anions when their concentrations were less than 20 ppm.