【摘要】 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。更多还原

【Abstract】 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 formalde- hyde content.更多还原