Catalytic Reaction-Oscillopolarographic Method for the Determination of Trace Amounts of Nitrite——Studies on the Catalytic System of NO2--BrO3--Methyl Red

Chem. J. Chinese Universities ›› 1992, Vol. 13 ›› Issue (6): 749.

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Catalytic Reaction-Oscillopolarographic Method for the Determination of Trace Amounts of Nitrite——Studies on the Catalytic System of NO₂^--BrO₃^--Methyl Red

JIANG Zhi-liang, LIANG Ai-hui, DAI Guo-zhong

Department of Chemistry, Guangxi Normal University, Guilin 541004

Received:1991-07-15 Online:1992-06-24 Published:1992-06-24

Abstract

Abstract: The present paper covers a novel and highly sensitive catalytic method for the determination of nitrite as low as 0.1 ng/mL, It is based on the fact that the nitrite ion catalyses the slow redox reaction between methyl red and BrO₃^- in 0.016 mol/L H₂SO₄ at 100℃.Cooling by tap water was chosen to quench the reaction.And oscillopolarography was used as detection technique for methyl red in NaOHmedium which exhibits a sensitive oscillopolarographic wave at -0.56 Vvs.SCE.Nitrite in water samples was analysed by this method with excellent results.

Key words: Nitrite, Methyl red, Catalytic method, Oscillopolarography

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JIANG Zhi-liang, LIANG Ai-hui, DAI Guo-zhong . Catalytic Reaction-Oscillopolarographic Method for the Determination of Trace Amounts of Nitrite——Studies on the Catalytic System of NO₂^--BrO₃^--Methyl Red[J]. Chem. J. Chinese Universities, 1992, 13(6): 749.

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Catalytic Reaction-Oscillopolarographic Method for the Determination of Trace Amounts of Nitrite——Studies on the Catalytic System of NO₂^--BrO₃^--Methyl Red

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