Based on the catalytic effects of trace formaldehyde on the reaction between potassium bromate and oxidized azur A,a new catalytic spectrophotometric method has been developed in this paper.

• 基于在一定温度和硫酸介质中,痕量甲醛对溴酸钾氧化天青A有较强的催化作用,建立了测定痕量甲醛的新的催化光度法。