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28 results on '"Miura, Jun'ichiro"'

16. Selective Determination of Nickel in Biological Samples by High Performance Liquid Chromatography.

Author

Cheng-Jie Zhang, Miura, Jun'ichiro, Kato, Takunori, and Nagaosa, Yukio

Subjects
*NICKEL, *HIGH performance liquid chromatography, *ORGANONITROGEN compounds, *SEPARATION (Technology), *SPECTROPHOTOMETRY, *ETHYLENEDIAMINETETRAACETIC acid
Abstract

A highly selective method for the determination of trace amounts of nickel(II) by high performance liquid chromatography was developed. 2-[(2-Hydroxyphenyl)azo]-4,5-diphenylimidazole (HAI) was used for pre-column derivatization of nickel(II) in reversed-phase chromatographic separation followed by spectrophotometric detection. In the presence of nickel(II), iron(III), cobalt(II), copper(II), cadmium(II), zinc(II), manganese(II), aluminum(III) and vanadium(V), only nickel(II) chelate with HAI gave a resolved peak in chromatograms with a C8-bonded reversed phase column and a 45% (w/w) acetonitrile-water mobile phase containing 1.0 × 10−4 mol kg−1 ethylenediaminetetraacetic acid and 5.0 × 10−3 mol kg−1 sodium acetate (pH 7.5). The nickel(II) chelate was detected spectrophotometrically at 585 nm. When 100 µL of a test solution was injected, the calibration graph was linear up to 240 pg for nickel(II), and the detection limit defined as three times the standard deviation of the reagent blank was 0.8 pg at 0.001 absorbance unit full scale. The proposed method was applied to the analysis of rice, tea leaves and mussels. [ABSTRACT FROM AUTHOR]

Published
2005
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23. Determination of Nickel with 1-(2-thiazolylazo)-2-naphthol bySolid-liquid Separation after Liquid-liquid Extraction and Spectrophotometry

Author

MIURA, Jun'ichiro and SATAKE, Masatada

Subjects
inorganic chemicals, human activities
Abstract

A spectrophotometric method for the determination of nickel based upon the extraction with TAN into a molten naphthalene is described. The nickel-TAN chelate is extracted quantitatively in the pH range 5.0 - 8.O. Zinc, iron(II) and iron(III) are masked with pyrophosphate. Copper and cobalt are masked with DTCS. Beer's law is obeyed over the nickel concentration range 2.0 - l8.Oμg per 20 ml of dioxane. The molar absorptivity at 595 nm is 4.1 x 104 1.mo1e-1.cm-l . Sandell sensitivity is 0.0014 ~g of nickel per 〓.

Published
1978

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