Determination Of Trace Organic Compounds In Propylene Glycol By Dispersed Liquid - Liquid Microextraction And Gas Chromatography - Mass Spectrometry

The dispersive liquid–liquid micro-extraction(DLLME) was a novel micro-extraction technique developed in 2006. This method is generally applicable for the trace component analysis in water samples. Compared with traditional extraction techniques, it has a lot advantages such as rapidity, simple for operation, separating effectively, and high enrichment factor. In this work,DLLME was used to separate and enrich the trace organic components in propylene glycol. During the extracting process, propylene glycol was not only employed as sample for analyze, but also used as a dispersive solvent for DLLME experiment. Then, the extractant was analyzed by GC-MS. The experiment shown that the method provide high enrichment factor for some low-polar or nonpolar compounds. The important parameters of the method were optimized such as extractant used, volume of extractant, volume of propylene glycol, volume of aqueous phase, and salt concentration in aqueous phase. After optimization, the method was validated and the recovery was ranged from 101%to 114%, linear regression:(R2) was 0.9999, the quantification limit(LOQ) was determined as 0.008μg/m L, the RSD % of repeatability was 4.1%. In addition,DLLME technique could combined with GC-MS-O(gas chromatography-mass spectrum-Olfactometry) technique study the off-odor components in some complex matrix samples.