A Study of Enhancing Agent in Kinetic Analytical Method(Ⅰ)──A New Mn(Ⅱ)-Potassium Periodate-Nitrilo Triacetic acid -1-(2-pyridylazo)-2-naphthol-Triton X-100 Catalytic Spectrophotometric System

Abstract

Abstract: The indicator reactions for using in kinetic spectrophotometry are necessarily those reactions of homogeneous system.If the reactants or the products are insoluble,these reactions can not be monitored by spectrophotometry.The authors change non-homogeneous systems into analog-homogeneous systems extending the range of selecting indicator reactions of kinetic spectrophotometry by adding surfactant to insoluble reactions with the solubilizing effect of surfactant.Anew catalytic spectrophotometric system for the determination of trace of Mn(Ⅱ)has been developed.This method is based on the catalytic oxidation of 1-2-pyridylazo)-2-naphthol by potassium periodate in the presence of Triton X-100 as a solubilized agent.The detection limit is 3.6×10^-3μg/mL,the relative standard deviation is 2.4%,the linear range of determination is 0.1～1.3 μg/25 mLfor Mn(Ⅱ). This method has been successfully used to determine Mn in cereal samples.

Key words: Catalytic spectrophotometry, Surfactant, 1-(2-Pyridylazo)-2-naphthol, Manganese

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ZHENG Zhao-Sheng, JING Wei-Guo. A Study of Enhancing Agent in Kinetic Analytical Method(Ⅰ)──A New Mn(Ⅱ)-Potassium Periodate-Nitrilo Triacetic acid -1-(2-pyridylazo)-2-naphthol-Triton X-100 Catalytic Spectrophotometric System[J]. Chem. J. Chinese Universities, 1995, 16(12): 1861.

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A Study of Enhancing Agent in Kinetic Analytical Method(Ⅰ)──A New Mn(Ⅱ)-Potassium Periodate-Nitrilo Triacetic acid -1-(2-pyridylazo)-2-naphthol-Triton X-100 Catalytic Spectrophotometric System

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