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Micellar liquid chromatographic determination of aluminum as its complex with 8-hydroxyquinoline-5-sulfonic acid

Memon M., Bhanger M. I.

Acta Chromatographica

2004

No. 14

172-179

A micellar liquid-chromatographic method is proposed for deter-mination of Al(III) as the 8-hydroxyquinoline-5-sulfonic acid derivative, with spectrofluorimetric detection. Cetyltrimethylammonium bromide, a ca-tionic surfactant (0.05 M), was used as mobile phase. The metal chelate was detected at γEx 410 and γEm 510 nm. Response to aluminum is selective in the presence of other metal ions. The method eliminates the need for addi-tion of reagent or organic modifier to the mobile phase, as is normal in RP HPLC. Under optimized conditions the linear range was 20–200 μg L-1 Al(III), the limit of detection 10 μg L-1, and the limit of quantification 40 μg L-1. The method was used to determine aluminum in a variety of water samples.

Interpretation of the piezoelectric photothermal spectra of p-type silicon samples

Maliński M., Memon M., Ikari T.

Archives of Acoustics

2003

Vol. 28, no. 2

139-148

This paper presents both experimental and theoretical amplitude and phase piezoelectric photothermal spectra (PPTS) of p-type silicon samples. two dominant peaks at 1.07 eV and 1.18 eV were observed in PPT spectra at room temperature. The relative intensities of these peaks change by a surface treatment. Numerical analysis is performed by supposing that an inactive layer exists at the sample surface. The characteristic structure observed in the piezoelectric amplitude spectra of p-Si samples is well explained by the model proposed for multilayer structure. We found that the proposed inactive layer model is quite helpful in investigating the surface properties of a semiconductor material.