纸张中荧光物质检测方法的对比

Comparative Analysis of Fluorescence Intensity and Fluorescent Migration in Paper

关键词:  白度法  荧光分光光度法  纸张  荧光物质迁移

Key Words:brightness  fluorescence spectrophotometry  paper  fluorescent material migration

摘要:以荧光增白剂VBL为标准物质，结合荧光分光光度法和白度法对比检测纸张中荧光增白剂的荧光强度和可迁移荧光物质含量，对按GB/T 5009.78—2003食品包装用原纸卫生标准被判定为荧光不合格的纸产品进行进一步检测。结果表明，荧光分光光度法检测中，标准物质VBL在浓度0～4 mg/L 范围内，有较好的线性相关性，可迁移荧光物质含量在5～1055 mg/kg之间；而白度法测试显示，纸张表面的荧光亮度与可迁移荧光物质含量未必一致，两者存在差异。白度法虽然能够测试纸张表面荧光物质是否存在，但是无法反映可迁移荧光物质的情况，同时对于可迁移荧光物质含量在10 mg/kg以下的纸张，白度法灵敏度较低。

Abstract:17 samples in which fluorescence was not meet the regulation requirement based on the analysis following the analysis method for food packaging base paper hygiene GB / T 5009.78—2003 were tested furtherly. Fluorescence intensity and fluorescent migration were tested by fluorescence spectrophotometry and brightness instrument respectively, using fluorescent whitening agent VBL as the standard material. When the concentrations of VBL were from 0 to 4.0 mg/L，they had a linear relationship with the emitted fluorescence intensity. The experiments showed that different methods derived different results. The fluorescent migration may be affected by basis weight of the paper and the manufacturing process. The brightness method, which can be used to test the fluorescent substance in the surface of paper, can not reflect the migration of fluorescent.