Abstract:

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 mathematica1 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).

Key words: acetylacetone spectrophotometric analysis, formaldehyde content, uncertainty