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《CHINA SURFACTANT DETERGENT & COSMETICS》 1999-01
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Study and Application for the Determinated of Boron in Cosmetics by Spectrophotometry

Li Zaijun Zhu Zhenzhong Chen Yepu Pan Jiaomai (Department of Chem.Eng.,Wuxi University of Light Industry,Wuxi,214036)  
hydroxy 3 methoxybenzylidene amino) 8 hydroxynaphalene 3 6 disulphonic acid is a sensitive new chromogenic reagent for Boron.In this work,its reaction with B has been studied.In a NH 4Ac HAc buffer medium of pH=5.7,B(Ⅲ) reacts with 1 (2 hydroxy 3 methoxybenzylidene amino) 8 hydroxynaphalene 3 6 disulphonic acid to form a 1∶2 yellow complex,a maximum absorption at 420nm.Its molar absorptivity is 7.19×10 3L·mol -1 ·cm -1 ,Sandell's sensitivity is 0.0015μg/cm 2,Beer's law is obeyed for 0μg~35μg B(Ⅲ)in 25mL.This method has been applied to the determination of B in cosmetics.The results are satisfactory.
【CateGory Index】: O657.32
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