Dual-wavelength Dual-indicator Catalytic Kinetic Determination Of Metal Cobalt And Manganese

Abstract:Several dual-indicator catalytic reaction system, the use of cobalt or manganese ion catalysis of double indicator system, based on the proportional relationship between the reaction rate and catalyst concentration, the establishment of the double indicator dual wavelength measurement of trace. A New Method of the component. Reagent and reaction medium, reaction time and temperature on the reaction rate on the part of the catalytic mechanism are discussed.This topic is to improve the measurement sensitivity of the method using the dual directions substance color complementary role in the selection of two single-wavelength system, research of the reaction rate and the catalyst concentration in the two systems in a similar experiment under the conditions of a single component or multiple components simultaneously existproportional relationship between, and the quantitative determination of the dynamics new Method of establishing the dynamics of the cobalt and manganese double indicator, dual wavelength measurement method. Mainly from the following aspects:1.CH3COOH-CH3COONa medium good catalytic hydrogen peroxide bengal reagent fade fading rate△A with Co (Ⅱ) concentration showed a linear relationship, which established for the determination of trace Co (Ⅱ)the new method of trace amounts of cobalt Co (Ⅱ). Use this method for determination of trace amounts of cobalt has good selectivity, high sensitivity, and obtained satisfactory results in the sample determination, is a better determination of trace amounts of cobalt analysis the method has some practical value.2.CH3COOH-CH3COONa medium Trace Co (Ⅱ) can be a good catalytic H2O2oxidation rose red fading rate△A with Co (Ⅱ) concentration showed a linear relationship. The experimental measurement of trace amounts of cobalt, cobalt sulfate used instrument is relatively simple, convenient operation. Accurate, high accuracy measurement results, the recovery rate is also higher. There are some practical value, the results were satisfactory.3.Catalytic effects on oxidation Arsenazo borax-boric acid buffer medium, the metal cobalt ions can make it fade, and at a wavelength of520nm to measure absorbance changes, thereby establishing Catalytic Kinetic SpectropHotometric Determination of Trace A New Method of the cobalt. Using a fixed time method, under the selected conditions, the linear relationship is0.0-0.1μg/mL. The method is highly sensitive and selective4. Research in nitric acid medium, Co (II), significant inhibition of fading reaction of hydrogen peroxide arsenazo I and crystal violet, Co (II) of the mass concentration of (0.25-4.0)×10-7g/25mLand AA was a goodlinear relationship, so as to further improve the analysis and determination of cobalt, expand the scope of the use of the kinetic spectropHotometric.5.In the course of the experiment, we found that acetic acid-sodium acetate medium manganese has a strong catalytic fading reaction of potassium periodate oxidation Fuchsine the malachite green, faded reaction rate with Mn (II)showed a good linear relationship with the concentration in a certain range. HAc-NaAc system the manganese catalytic Fuchsine and malachite green reaction, the establishment of the new method for dual wavelength double indicator spectropHotometric determination of manganese, the high sensitivity, good selectivity.The experiments show that the dual-indicator catalytic system not only improved the sensitivity of the kinetic analysis method can also improve the selectivity of the determination to expand the scope of the analysis of the dynamics.