食品罐头内壁涂料中游离甲醛测定的影响因素

Affecting factors for the determination of trace formaldehyde of coatings in inner wall of food cans

中文关键词:  食品罐头内壁涂料  游离甲醛  影响因素

英文关键词:coatings for inter wall food cans  determination of trace formaldehyde  factors

中文摘要:

      目的 根据GB/T 5009.60-2008《食品罐头内壁环氧酚醛涂料卫生标准的分析方法》测定食品罐头内涂涂料中游离甲醛时, 数据的波动往往较大, 影响了结果的有效性。因此对浸泡方式、恒温方式等前处理过程以及变色酸测定甲醛过程中的影响因素进行了考察。方法 采用紫外分光光度法测定甲醛的溶出量, 并比较各因素的影响。结果 浸泡方式、恒温方式决定了食品罐头内壁涂料中甲醛的溶出量, 而硫酸的纯度、硫酸的滴加速度、摇匀速率等因素直接影响了甲醛显色的线性。结论 选择优级纯硫酸, 控制硫酸的滴加速度在5~10 mL/min, 并保证显色过程由同一个人完成, 对保证数据的准确性和重复性有着重要的意义。

英文摘要:

      Objective According to GB/T 5009.69-2008 “Method for analysis of hygienic standard of epoxy phenolic coating for the internal lacquer of food cans” determination of trace formaldehyde of coatings , it has a larger fluctuation for the determination result. So the paper discusses the possible factors, such as immersion, constant temperature, and determination of factors influencing formaldehyde chromotropic acid method. Method Dissolution determination of formaldehyde by ultraviolet spectrophotometry, and compared the effect of each factors. Results Immersion, constant temperature determined the dissolution amount of formaldehyde. The factor such as the purity of sulfuric acid, the acceleration drops of sulfuric acid and the acceleration drops of sulfuric acid determined the determination of formaldehyde. Conclusion The choice of GR sulfuric acid, sulfuric acid droplets acceleration control in 5~10 mL/min, and to ensure that the coloring process performed by the same individual, is of great significance to ensure data accuracy and repeatability.