Abstract
AbstractThe spectrophotometric properties of zinc complexes with murexide in the absence and presence of cationic, anionic and nonionic surfactants were studied. The addition of cationic surfactants stabilized the complex and hence improved the intensity of the absorption band (sensitized the reaction). A method for the determination of >0.01% zinc in aluminum metal and some aluminum base alloys was developed. The method was based on measuring the absorbance of the formed complex with murexide and cetylpyridinium bromide at pH 8. The apparent molar absorptivity was 4.7 ± 0.01 × 104 litre mol−1 cm−1 at 470 nm. A linear calibration curve was obtained for up to 1.44 ppm of zinc. In the presence of sodium fluoride and thiourea masking solutions, common ions in aluminum metal and alloys did not interfere.
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