Abstract
AbstractThe paper presents a novel method for the separation/enrichment of trace Ni2+ 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 Ni2+ have been investigated to select the experimental conditions. The possible enrichment mechanism of Ni2+ was discussed. The results showed that under the optimum conditions, Ni2+ could be quantificationally adsorbed on the surface of microcrystalline phenolphthalein in the form of the chelate precipitate of Ni(DDTC)2, while K+, Na+, Ca2+, Mg2+, Zn2+, Fe2+, Al2+, Pb2+ and Cd2+ could not be adsorbed at all. Therefore, Ni2+ 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 Ni2+ in various water samples, and the results agreed well with those obtained by FAAS method.
Published Version
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