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2012•Journal of Shaoyang UniversityRequires access

Study on Spectrophotometric Determination of Potassium Bromate by Oxidation-Decoloration of PAN

Yang Wei-ping

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Abstract

Using the oxidation-decoloration of 1-(2-pyridylazo)-2-naphthol(PAN),a new method for the determination of the trace potassium bromate was established.The appropriate conditions for the oxidation of PAN by potassium bromate in hydrochloric acid medium were studied.The maximum absorption peak is located at 440 nm with an apparent molar absorption coefficient of 1.4×104L·mol-1·cm-1.The linear range is 4~20mg/L,the recovery was from 93% to 105%,relative standard deviation was 2.3%;detection limit was 1.09 mg/L.The proposed method has been applied in determining of trace potassium bromate in food sample with satisfactory results.

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What this paper is about

Using the oxidation-decoloration of 1-(2-pyridylazo)-2-naphthol(PAN),a new method for the determination of the trace potassium bromate was established.The appropriate conditions for the oxidation of PAN by potassium bromate in hydrochloric acid medium were studied.The maximum absorption peak is located at 440 nm with an apparent molar absorption coefficient of 1.4×104L·mol-1·cm-1.The linear range is 4~20mg/L,the recovery was from 93% to 105%,relative standard deviation was 2.3%;detection limit was 1.09 mg/L.The proposed method has been applied in determining of trace potassium bromate in food sample with satisfactory results.

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Available abstract

Using the oxidation-decoloration of 1-(2-pyridylazo)-2-naphthol(PAN),a new method for the determination of the trace potassium bromate was established.The appropriate conditions for the oxidation of PAN by potassium bromate in hydrochloric acid medium were studied.The maximum absorption peak is located at 440 nm with an apparent molar absorption coefficient of 1.4×104L·mol-1·cm-1.The linear range is 4~20mg/L,the recovery was from 93% to 105%,relative standard deviation was 2.3%;detection limit was 1.09 mg/L.The proposed method has been applied in determining of trace potassium bromate in food sample with satisfactory results.

Key concepts: Potassium bromate, Bromate, Hydrochloric acid, Chemistry, Potassium, Detection limit, Absorption (acoustics), Relative standard deviation

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