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| Tri-Wavelength UV Spectroscopy Method by Figuring out the Isobestic Points Shift for the Determination of Fluorescent Whitening Agents in Paper Products |
| HE Zhi-heng1, XU Rong2, LIN Jun-feng2, YAN Ning1, CHEN Chun-xia3, CHEN Run-quan3, CHAI Xin-sheng1, 3* |
1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
2. Shenzhen Customs Industrial Products Testing Technology Center, Shenzhen 518000, China
3. National Paper Product Quality Supervision Inspection Center, Dongguan 523080, China |
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Abstract In the current GB/T 27741—2018 “Paper and board—Determination of migratable fluorescent whitening agents (FWAs)” when extracting paper products, the residual lignin leached from cellulose which would interferespectral detection of FWAs. In this paper reported a tri-wavelength UV spectroscopy method for the determination of FWAs in paper products. By figuring out the isosbestic points shift at the range of 321～374 nm, the spectral interference of other species in the extraction solution on the FWAs measurement can be mathematically corrected. The results showed that the present method has the relative standard deviation of 3.7% and recovery of 99.1 and 107%, with the limit of the quantity of 19 mg·kg-1. Compared with the current FWAs detection method, the method has the advantages of simple analysis, easy operation of the instrument, and the like. Therefore, it is suitable for rapid and accurate determination of the content of migratable FWAs in various paper products, especially printing related materials and can guarantee the production quality control and market supervision of paper products.
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Received: 2019-05-30
Accepted: 2019-09-10
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Corresponding Authors:
CHAI Xin-sheng
E-mail: xschai@scut.edu.cn
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[4] GB/T 27741—2018. Paper and Board-Determination of Migratable Fluorescent Whitening Agents（纸和纸板可迁移性荧光增白剂的测定）.
[5] SHE Ji-feng(佘集锋). HuBeiZaoZhi(湖北造纸), 2007, (2): 36. |
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