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研究了钒(Ⅴ)催化KBrO3氧化2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯酚(CTZAPN)的退色反应及其动力学条件,退色反应程度与钒(Ⅴ)量在一定范围内呈线性关系,建立了测定痕量钒(Ⅴ)的催化动力学光度法。在H2SO4介质中,退色体系的最大吸收波长455 nm,钒(Ⅴ)的质量浓度在0.004~0.04μg/mL范围内符合线性关系,回归方程为ΔA=14.265 2ρ+0.002 07(ρ:μg/mL),相关系数r=0.998 7,体系的表观摩尔吸光系数为ε=7.30×105L.mol-1.cm-1,检出限为2.99×10-10g/mL。方法不经分离直接测定面粉和花生样品中的痕量钒,测定结果与AAS法的测定值相符。
The fading reaction of vanadium (Ⅴ) -catalyzed 2- (5-carboxy-1,3,4-triazolylazo) -5-diethylaminophenol (CTZAPN) catalyzed by KBrO3 and its kinetic conditions, And vanadium (Ⅴ) content in a certain range of linear relationship between the establishment of a trace of vanadium (Ⅴ) catalytic kinetic spectrophotometry. In H 2 SO 4 medium, the maximum absorption wavelength of fading system was 455 nm. The linear range of the mass concentration of vanadium (V) was 0.004-0.04 μg / mL. The regression equation was ΔA = 14.265 2ρ + 0.002 07 (ρ: μg / mL ), The correlation coefficient r = 0.998 7, the apparent molar absorptivity of the system is ε = 7.30 × 105L.mol-1.cm-1, the detection limit is 2.99 × 10-10g / mL. Methods Direct determination of trace vanadium in flour and peanut samples without isolation was performed and the results were consistent with those obtained by AAS.