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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 5
BKCSDE 21(5)
May 20, 2000 

Determination of Trace Amounts of Nickel(II) with a-(2 -Benzimidazolyl)-a', a''-(N-5-nitro-2 -pyridyl hydrazone) toluene in the Presence of Triton X-100 by Fluorescence Method
Chan-Il Park, Hyun-Soo Kim, Ki-Won Ch
A method is described for the fluorimetric determination of nickel,based on the formation of Ni(II)-a-(2-Ben-zimidazolyl)-a',a"-(N-5-Nitro-2-Pyridylhydrazone)-toluene complex in the presence of a non-ionic surfactant.The complex has practically no fluorescence in the absence of surfactant, but the addition of Triton X- 100 makes possible the fluorimetric determination of low concentrations of Ni(II) as it enhances the fluorescence intensity of the complex by up to about 5-fold. This method is very sensitive and selective for the direct deter-mination of nickel ion. The optimum conditions are a Triton X-100 concentration of 2.0 mL (5.0%, v/v) and pH 9.0 ±0.2 (ammonium chloride-ammonia buffer). The fluorescence is measured at 337 nm of emission wavelength under 300 nm of excitation wavelength. The fluorescence intensity is a linear function of the con-centration of Ni(Il) in the range 5-70 ng/mL, and the detection limit is 2.0 ng/mL. The proposed method has been successfully applied to the determination of trace amounts of Ni(ㅣㅣ) in food and human hair samples.
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