Analytical Sciences

Spectrophotometric Determination of Aluminum with m-Carboxyphenylfluorone, a Novel Chemical Probe, and Its Application

Shinichiro KAMINO, Takako YAMAGUCHI, Terumi MORI, Mika MIYAMOTO, Yukimi KUSUMI, and Yoshikazu FUJITA

Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 669-1094, Japan

A highly spectrophotometric method for the determination of aluminum was developed. This method used the color reaction between m-carboxyphenylfluorone (MCPF) as a novel chemical probe and aluminum in the presence of a surfactant, poly(N-vinylpyrrolidone) (PVP, K-90) (0.03 - 1.40 µg of aluminum in a final volume of 10 ml at 561 nm). The proposed method showed excellent sensitivity (molar absorptibity of 1.70 × 10⁵ l mol^-1 cm^-1) and reproducibility (within-day precision: RSD = 0.35% n = 6, between-day precision: RSD = 0.44% n = 6). Linearity was achieved over the range 3 - 140 µg L^-1 with a correlation coefficient of 0.9999, and the effects of foreign substances were low.

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