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Photometric Determination of Traces of Aluminum in Foodstuffs With p-Acetylchlorophosphonazo as Color Reagent

Tian Lixia

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Abstract

In an acetate buffer medium of pH 4.3,a blue-violet complex was formed by the reaction of Al(Ⅲ) with p-acetylchlorophosphonazo(abbreviated as CPA-pA) with its molar ratio of 1 to 1.Absorption maxima of the complex was found at the wavelength of 604 nm and its apparent molar absorptivity was 9.92×103L·mol-1·cm-1.Beer′s law was obeyed over the range within 0.60 mg·L-1 of aluminum(Ⅲ).The proposed method has been applied to the determination of aluminum in 3 samples of foodstuff,RSD′s(n=7) values calculated from the analytical results were in the range from 1.03% to 2.16%,and values of recovery found were in the range of 96.5% to 101.0%.

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What this paper is about

In an acetate buffer medium of pH 4.3,a blue-violet complex was formed by the reaction of Al(Ⅲ) with p-acetylchlorophosphonazo(abbreviated as CPA-pA) with its molar ratio of 1 to 1.Absorption maxima of the complex was found at the wavelength of 604 nm and its apparent molar absorptivity was 9.92×103L·mol-1·cm-1.Beer′s law was obeyed over the range within 0.60 mg·L-1 of aluminum(Ⅲ).The proposed method has been applied to the determination of aluminum in 3 samples of foodstuff,RSD′s(n=7) values calculated from the analytical results were in the range from 1.03% to 2.16%,and values of recovery found were in the range of 96.5% to 101.0%.

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Available abstract

In an acetate buffer medium of pH 4.3,a blue-violet complex was formed by the reaction of Al(Ⅲ) with p-acetylchlorophosphonazo(abbreviated as CPA-pA) with its molar ratio of 1 to 1.Absorption maxima of the complex was found at the wavelength of 604 nm and its apparent molar absorptivity was 9.92×103L·mol-1·cm-1.Beer′s law was obeyed over the range within 0.60 mg·L-1 of aluminum(Ⅲ).The proposed method has been applied to the determination of aluminum in 3 samples of foodstuff,RSD′s(n=7) values calculated from the analytical results were in the range from 1.03% to 2.16%,and values of recovery found were in the range of 96.5% to 101.0%.

Key concepts: Molar absorptivity, Reagent, Analytical Chemistry (journal), Absorption (acoustics), Color reaction, Aluminium, Chemistry, Buffer solution

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Photometric Determination of Traces of Aluminum in Foodstuffs With p-Acetylchlorophosphonazo as Color Reagent — Research Paper | ScholarLens