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根据表面活性剂和荧光增白剂之间的相互作用,提出了浊点萃取-同步荧光法测定纸制样品中痕量荧光增白剂VBL的新方法。研究发现,相比于传统荧光发射光谱,当最佳波长差为30 nm时,VBL在402 nm处有一强度高、峰型窄的同步荧光峰。体系的相对荧光峰强度与VBL的浓度在0.001~0.053μg/mL范围内呈良好的线性关系,相关系数0.9993,线性方程为IF=10729.48ρ(μg/mL)+42.36,检测限(3S/K)为8.415×10-4μg/mL。方法用于样品测定,回收率在90.6%~102%之间,相对标准偏差在1.3%~5.2%之间。
Based on the interaction between surfactant and optical brightener, a new method for the determination of trace optical brightener VBL in paper samples by cloud point extraction-synchronous fluorescence was proposed. Compared with the traditional fluorescence emission spectra, the VBL has a high intensity and narrow peak at the wavelength of 402 nm when the best wavelength difference is 30 nm. The relative fluorescence peak intensity of the system was linear with the concentration of VBL in the range of 0.001 ~ 0.053 μg / mL with a correlation coefficient of 0.9993. The linear equation was IF = 10729.48 ρ (μg / mL) +42.36. The detection limit was 3S / K ) Was 8.415 × 10-4 μg / mL. The method was applied to the determination of the samples with recoveries of 90.6% -102% and relative standard deviations of 1.3% -5.2%.