催化光度法测定一次性纸杯浸泡液中痕量甲醛

Catalytic Spectrophotometric Determination of Trace Formaldehyde in Disposable Paper Cups

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。方法的线性范围为0．045～0．56mg/L,检出限为0．019mg/L。对0．11mg/L的甲醛标准溶液11次测定的相对标准偏差为0．38%。用于一次性纸杯浸泡液中甲醛含量的检测,发现纸杯浸泡液中甲醛含量较少,可以安全使用。

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. The detection limit is 0.019 mg/L with linear range of 0.045-0.56 mg/L. The RSD （relative standard deviation） is 0.38%. This method has been applied for the detection of trace formaldehyde in disposable paper cups. The results showed that the paper cups can be used safely, with little formaldehyde content.