【摘要】 在沸水浴中,痕量甲醛与乙酰丙酮能发生微弱的显色反应。实验发现,非离子表面活性剂OP对上述反应有较强的增敏作用,由此建立了一种测定痕量甲醛的新方法。溶液的最大吸收波长在412 nm,检出限为0.1498μg/mL,9次空白实验的标准偏差为0.0043,相对标准偏差为0.51%,方法用于测定大白菜中的甲醛时,测得结果与非增敏乙酰丙酮光度法及HPLC法的结果一致,所得结果的RSD均小于2.5%,回收率为101%～104%。更多还原

【Abstract】 In a boilling water bath,formaldehyde could feebly react with acetylacetone.The non-ionic surfactant OP could sensitize the colour reaction.The experimental results showed that the maximum absorption wavelength was 412 nm.The detection limit was 0.1498 μg/mL.The standard deviation and the relative standard deviation for nine blank replicates were 0.0043 and 0.51%.The analysis results to the vegetables with this method were same as the results with the HPLC method,and the RSD was less than 2.5% and recoveries were in the range of 101% to 104%.更多还原