2008•Journal of Huaihai Institute of TechnologyRequires access

Study on the Fading Photometric Determination of Micro-amounts of Bromate with Ponceau S

Xing‐You Xu

Abstract

A new photometric method for the determination of micro-amounts of bromate is proposed based on the oxidation of Ponceau S in HCl medium.The optimal conditions were studied.The maximum Absorption of Ponceau S lies at 510 nm.A decrease of Ponceau S Absorbance results from its oxidation by bromate,and a linear relationship is established between the decrease of Absorbance and bromate concentration of 0.5—5.0 μg/mL.Beer's law is obeyed with the regression equation A510=0.318 5ρ-0.040 6,the related coefficient 0.994 94 and the Molar Absorbance coefficient 4.08×104 L/(mol·cm).The proposed method has been applied to the determination of micro-amounts of bromate in chemical reagents with satisfactory results.

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Key concepts: Bromate, Absorbance, Reagent, Chemistry, Molar absorptivity, Analytical Chemistry (journal), Spectrophotometry, Correlation coefficient