Qualitative and Quantitative Analysis of Bis-(4-Carboxyphenyl)-phenylphosphine Oxide

The fire retardant,bis-(4-carboxyphenyl)-phenylphosphine oxide (BCPPO) was synthesized and its structure and purity were characterized by DSC,FT-IRS,1HNMR and elementary analysis.As shown in the UV-absorption spectrum,absorption maximum of BCPPO in pyridine solution was found at the wavelength of 302 nm.Linear relationship between values of absorbance and concentration of BCPPO was obtained in the range of 6.0×10-5-3.6×10-3mol·L-1.Based on these facts,UV-spectrophotometry was proposed for the determination of BCPPO,and RSD′s (n=5) were found in the range of 0.14%-0.25%.The interference of benzoic acid,a by-product of the synthesis,was avoided by this method.