催化动力学光度法测定痕量甲醛

Determination of Trace Formaldehyde by Catalytic Kinetic Spectrophotometry

在稀硫酸溶液中,甲醛对溴酸钾氧化铬黑T的褪色反应有催化作用,研究了其动力学条件,建立了测定痕量甲醛的动力学光度分析法,该方法的线性范围为0.008-0.10μg/mL,检出限为1.005×10^(-9)g/ml,该法用于啤酒和大气中痕量甲醛的测定,标准加入回收率为93.8%-94.8%.

A kinetic spectrophotometric method for determination of trace formaldehyde was proposed. Formaldehyde catalyzed the discoloring reaction of Eriochrome black T oxidized by KBrO3 in sulfuric acid. The linear range was 0. 008 - 0.10μg/mL with the detection limit of 1. 005 × 10 ^-9g/ml, The proce- dure was used to determine the formaldehyde in drink and a/r sample. The recoveries in standard addition method were 93.8% -94.8%.