Catalytic Spectrophotometric Determination of Trace Iron Based on Oxidation of Bromocresol Purple by Hydrogen Peroxide

FOOD SCIENCE ›› 2007, Vol. 28 ›› Issue (9): 490-493.

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Catalytic Spectrophotometric Determination of Trace Iron Based on Oxidation of Bromocresol Purple by Hydrogen Peroxide

WEI Xin-Jun, WEI Qian-Qian, 南Hai-Juan , NIU Sheng-Yang

College of Food Sicence,Henan Institute of Science and Technology,Xinxiang 453003,China

Online:2007-09-15 Published:2011-11-22

Abstract

Abstract: A new method has been developed for determination of trace iron,based on the discoloration of bromcresol purple by hydrogen peroxide in H2SO4 solution under the catalysis of iron(Ⅲ).The linear range of the method is 0.05～0.6μg iron(Ⅲ)/25 ml,and the apparent molar absorptivity is 8.36×105L/mol·cm.The method has been applied to determine trace iron(Ⅲ)in monosodium glutamate with satisfactory results.

Key words: catalytic spectrophotometric, iron, bromcresol purple, hydrogen peroxide

WEI Xin-Jun, WEI Qian-Qian, 南Hai-Juan , NIU Sheng-Yang. Catalytic Spectrophotometric Determination of Trace Iron Based on Oxidation of Bromocresol Purple by Hydrogen Peroxide[J]. FOOD SCIENCE, 2007, 28(9): 490-493.

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Catalytic Spectrophotometric Determination of Trace Iron Based on Oxidation of Bromocresol Purple by Hydrogen Peroxide

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