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Study on Determination of Trace Nickel in Water Samples after Separation/enrichment using Microcrystalline Phenolphthalein Loaded with Chelate
Author(s) -
Wen XinRong,
Tu ChangQing
Publication year - 2012
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200045
Subject(s) - phenolphthalein , microcrystalline , chemistry , chelation , nickel , metal ions in aqueous solution , adsorption , nuclear chemistry , trace amounts , metal , sodium diethyldithiocarbamate , inorganic chemistry , medicine , alternative medicine , organic chemistry , pathology , crystallography
The paper presents a novel method for the separation/enrichment of trace Ni 2+ using microcrystalline phenolphthalein loaded with chelate prior to the determination by spectrophotometry. The effects of different parameters, such as the dosages of phenolphthalein and sodium diethyldithiocarbamate (DDTC), various salts and acidity on the enrichment yield of Ni 2+ have been investigated to select the experimental conditions. The possible enrichment mechanism of Ni 2+ was discussed. The results showed that under the optimum conditions, Ni 2+ could be quantificationally adsorbed on the surface of microcrystalline phenolphthalein in the form of the chelate precipitate of Ni(DDTC) 2 , while K + , Na + , Ca 2+ , Mg 2+ , Zn 2+ , Fe 2+ , Al 2+ , Pb 2+ and Cd 2+ could not be adsorbed at all. Therefore, Ni 2+ was completely separated from the above metal ions in the solution. A new method for the separation/enrichment and determination of trace nickel using microcrystalline phenolphthalein loaded with chelate was established. The proposed method has been successfully applied to the determination of Ni 2+ in various water samples, and the results agreed well with those obtained by FAAS method.