The gas chromatographic analysis of lacquer thinner.

Abstract

By using high sensitive gas chromatogrph (equiped with flame ionization detector, sensitivity: 2mV/200mm full scale) 46 commercial laquer thinners and 10 organic solvents used in three industries (in Kyoto City) were analyzed.Tricresylphosphate (supported on firebrick C-22, 80-100 mesh) was used as stationary phase and maintained at 100°C. Column sizes were 4mm I.D. and 4m L. The purified nitrogen was used as the carrier gas and its flow rate was regulated at 38-40ml/min. Each sample solvent of 4-8μl was injected into the gaschromatographic system by microsyringe.Each peak appeared on the chromatogram was identified by comparing with the relative retention volumes (VR) for the standard substances (VR of benzene=1.000). The quantitative determination of component was performed by applying the peak area method (half band width method).The results were as follows:1. On each chromatogram, 12-43 organic components were identified.2. The average concentration of the contents classified by chemical structures were as follows: aromatics 36%, aliphatics 11%, chlorides and alcohols 10%, acetates 7%, ketone 1%, and aldehyde 0.3% respectively.3. The average concentrations of important components which could be detected were as follows: toluene (17%), total xylene (m.p.o.) (12%), benzene (7%), trichloroethylene (6%), butylalcohol (n.i. sec. tert.) (5%), tetrachroroethylene (4%), methylmetacrylate (3%).4. Among the detected components in sample solvents, the concentration of benzene was the highest (48%).