Research on Analytical Method of Migratable Fluorescent Whitening Agent in Paper Products

This research is focused on the quantitative analysis of migratable fluorescent whitening agent (FWA) VBL in paper products according to standards of GB/T 27741-2018 and CY/T 132.1-2015. Analytical method validation is carried out to investigate linearity, precision and accuracy. The analytical method validation results show that the relative standard deviation (RSD) is 1.52–2.02% and the recovery is 55.1–56.4% in the analysis of migratable VBL by ultraviolet visible (UV-Vis) spectrophotometer. Meanwhile, several factors affecting the quantitative determination result are discussed. Moreover, by using photoluminescence spectrophotometer and an optimal extraction method, the RSD is 3.24% and the accuracy has been improved significantly, which generates a recovery of 90.7%. This research is of great help for the development of the determination of migratable FWAs in paper products.