How to judge whether or not the fluorescent substances in paper cups or paper packages exceed the standard?
Recently, the relevant departments have done testing and Statistics: 68 batches of samples have been tested, of which 41 batches have been detected, accounting for 60.3% of the total number of tests, and 27 of them are qualified, accounting for 39.7%. The detection of food packing paper in 20 batches, 9 batches failed, the failure rate of 45%; detection of fruit packing paper of 13 batches, 12 batches failed, the failure rate of 92.3%; detection of fruits and vegetables carton 35 batches, 20 batches failed, the failure rate of 57.1%.
According to the GB/T 5009.78-2003 standard, 254nm and 365nm ZW-III UV analyzer were used to detect the fluorescent material samples. Sensory testing, the maximum fluorescent area of less than 5 square centimeters for qualified, otherwise unqualified. In accordance with the use of the test samples will be divided into candy, chocolate and beverage packaging boxes of food, for apples, pears, fruit packing paper and fruit and vegetable cartons.
Now in our country for the fluorescent substance of paper is not a perfect standard analysis method, the GB/T5009.78-2003 standard for food hygiene paper fluorescent material qualitative test method, this method uses ZW-III UV analyzer to detect whether the paper samples exceeded the limit standard, his detection methods include difference method, fluorescence spectrophotometry, HPLC the chromatographic method, these methods can only indirectly reflect the fluorescence content in paper. At present, the inspection of fluorescent substance in paper mainly adopts the GB/T5009.782003 standard.
