Journal
JOURNAL OF ANALYTICAL CHEMISTRY
Volume 72, Issue 10, Pages 1018-1023Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1061934817080032
Keywords
nickel; preconcentration; microextraction; spectrophotometric determination; dimethylglyoxime
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Funding
- VEGA Research Grant Agency of the Ministry of Education of the Slovak Republic
- Slovak Academy of Sciences [1/0253/16]
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A procedure was developed for the extraction and preconcentration of nickel as its dimethylglyoxime complex using triethylamine. Triethylamine on exposure to CO2 changes its hydrophilicity and converts into a polar water-miscible form. The separation of the extractant was achieved by adding a concentrated alkaline solution to the extraction mixture. The nickel-enriched triethylamine extract was separated and evaporated, the residue was dissolved in chloroform (50 mu L), and absorbance at 380 nm was measured. Conditions for the determination of nickel (pH of the medium, concentrations of dimethylglyoxime and NaOH, type and volume of dispersive solvent, ultrasonic exposure, stirring time) were optimized. A procedure for the spectrophotometric determination of nickel with a limit of detection of 0.020 mu g/mL (n = 10; P = 0.95) was developed. The linearity range was from 0.050 to 0.60 mu g/mL. Most of nickel-related ions (Fe3+, Fe2+, Co2+, Cu2+, Zn2+, Cd2+, Pb2+, Hg2+) do not interfere with its determination. The procedure was applied to the analysis of water samples.
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