罐头内壁环氧酚醛涂料甲醛含量不确定度分析

Uncertainty Evaluation of Formaldehyde Content in Epoxy Phenolic Resin Coating on Internal Wall of Food Can

对用乙酰丙酮分光光度法测定食品罐头内壁环氧酚醛涂料中甲醛含量进行研究。建立不确定度评定程序和方法,并依据GB/T5009.69—2003建立数学模型。确定影响甲醛含量的主要因素,归纳测定过程中不确定度的主要来源。对各不确定度分量进行量化,经合成得到相对标准不确定度,从而求得扩展不确定度。当甲醛含量为0.0739mg/L时,相对不确定度为0.0275,扩展不确定度为0.0041mg/L(k=2)。

The acetylacetone spectrophotometric method was applied to determine formaldehyde content in epoxy phenolic resin coating on the internal wall of food can. A procedure was established to evaluate the uncertainty of the determination of formaldehyde content by this method, and a mathematical model was set up based on the Chinese national standard GB/T 5009.69 -- 2003. The primary factors influencing formaldehyde content were confirmed, and the main origins of the uncertainty were proposed. The various factors of relative standard uncertainty were calculated and synthesized, and the expanded uncertainty was obtained. When the formaldehyde content was 0.0739 mg/L, the relative standard uncertainty was 0.0275, and the expanded uncertainty was 0.0041 mg/L （k = 2）.