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阐述了GB 18582-2001和GB 18583-2001标准中采用乙酰丙酮分光光度法测定游离甲醛含量的检测方法差异,主要包括乙酰丙酮的试剂要求、标准曲线的绘制、测定波长的选择和样品前处理等方面的差异。在详细分析两种检测结果差异原因的基础上,对两种测试标准进行改进,提出了适合水性涂料和水性胶粘剂中游离甲醛含量的测定方法;其线性范围为1～25μg,相关系数为0.9999;按照改进的测试方法,水性涂料和水性胶粘剂样品中甲醛含量的测定结果的相对标准偏差分别为1.9%和2.3%,平均回收率分别为94.2%和95.8%。
The differences of detection methods for determination of free formaldehyde in GB 18582-2001 and GB 18583-2001 are described, including the reagent requirements of acetylacetone, the preparation of standard curve, the selection of determination wavelength and sample preparation The difference. Based on the detailed analysis of the differences between the two test results, the two test standards were improved. The determination method of free formaldehyde in water-based paint and water-based adhesives was proposed. The linear range was 1 ~ 25μg and the correlation coefficient was 0.9999. According to the improved test method, the relative standard deviations for the determination of formaldehyde content in waterborne coatings and waterborne adhesives were 1.9% and 2.3%, respectively, and the average recoveries were 94.2% and 95.8%, respectively.