Determination of fluorescent whitening agent in emulsion paint based on fluorescence spectrophotometry

摘要

Fluorescence spectrophotometry was applied to the determination of fluorescent whitening agent in emulsion paint. At temperature of 30°C, linear relationship was found between fluorescence intensity and concentration of fluorescent whitening agent in the range of 0.025-0.25mg/ml when the emission wavelength was 437nm and excitation wavelength was 347nm, correlation conefficient was 0.998, detection limit was 0.0007mg/ml, relative standard deviation ranged from 0.49% to 0.72%, recovery of standard addition ranged from 98.3% to 104.5%. The influence of storage time and exposure time were also studied here. Measurement results indicated the feasibility and precision of using this method for quantitative analysis of fluorescent whitening agent.