Photoacoustic spectrum of nickel dimethylglyoxime complex and microdetermination of nickel

YOKOYAMA Yu, NAKAMURA Nobuo

doi:10.2116/bunsekikagaku.28.2_97

Photoacoustic spectrometer was constructed, by which methods were investigated for measuring the absorption spectrum of solid sample and for determining microamounts of metal. Nickel dimethylglyoxime complex was prepared on filter paper by the technique of spot test. The optimal conditions for preparation of the complex were examined regarding physical properties of filter paper, volume of sample solution, pH of the sample solution and so on. The optimal conditions for photoacoustic signal measurement were examined regarding black standard, chopping frequency of incident radiation and so on. Photoacoustic signal intensity was normalized with respect to signal intensity from black standard to compensate for the wavelength distribution of intensity of incident radiation. The photoacoustic spectrum of solid nickel dimethylglyoxime complex was obtained in the visible wavelength region. The absorption maximum at approximately 540 nm and the increase in absorption towards 410 nm correspond well to the reflectance minima at approximately 545 nm and 400 nm in diffuse reflectance spectrum of the same sample, respectively. The photoacoustic spectrum was different from absorption spectra of the solutions of nickel dimethylglyoxime complex. The calibration curve obtained by plotting normalized signal intensity at 540 nm against nickel amount was linear from 5 to 50 ng.

Photoacoustic spectrum of nickel dimethylglyoxime complex and microdetermination of nickel

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