Accession Number : AD0683159

Title :   QUANTITATIVE ANALYSIS OF p-PHTHALIC ACID BY INFRARED SPECTRUM,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Ch'en Chang-ch'iang, ; Chang Yu-ch'ien,

Report Date : 30 SEP 1968

Pagination or Media Count : 11

Abstract : A quantitative method is described for determining p-phthalic acid in synthetic resins, synthetic fibers, and plastifiers by infrared absorption spectrum. The apparatus used was a infrared spectrometer. Infrared absorption spectra of p- and o-phthalic acid in N, N-dimethyl formamide in varying concentrations from 5 mg to 25 mg/ml were spectrographed. Results showed that a p-phthalic acid absorption band peak occurred at 754/cm, and o-phthalic acid peaks at 819 and 769/cm. A linear relationship was shown when the value of log I0/I (relative intensity) was plotted against corresponding concentration. Experimental results also showed that o-phthalic acid had some effect on p-phthalic acid determination that when the spectrum of an unknown sample was compared with the knowns containing both p- and o-phthalic acid.

Descriptors :   (*PHTHALIC ACIDS, *INFRARED SPECTROSCOPY), CHEMICAL ANALYSIS, MOLECULAR ISOMERISM, INFRARED SPECTRA, MIXTURES, SOLVENTS, FORMAMIDES, CHINA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE