Headspace SPME GC/FID를 이용한 Chlorinated Solvents의 경쟁적 추출효과에 관한 연구

초록

In this study, Solid-phase microextraction (SPME) with GC/FID was studied as a possible alternative to liquid-liquid extraction for the analysis of chlorinated solvents (PCE and TCE) and these by-products (cis-DCE, VC, and Ethylene). Experimental parameters affecting the SPME process (such as kind of fibers, adsorption time, desorption time, volume ratio of sample to headspace,salt addition, and magnetic stirring) were optimized. Experimental parameters such as CAR/PDMS, adsorption time of 20 min,desorption time of 5 min at 250℃, headspace volume of 50mL, sodium chloride (NaCl) concentration of 25% combined with magnetic stirring were selected in optimal experimental conditions for analysis of chlorinated solvents and these by-products. The general affinity of analytes to CAR/PDMS fiber was high in the order PCE>TCE>cis-DCE>VC>Ethylene. The linearity of R2 for chlorinated solvents and these by-products was from 0.912 to 0.999 when analyte concentrations range from 10μg/L to 500μg/L, respectively. The relative standard deviation (% RSD) were from 2.1% to 3.6% for concentration of 500μg/L (n=5), respectively. Finally, the limited of detection (LOD) observed in our study for chlorinated solvents and these by-products were from 0.5μg/L to 10μg/L,respectively.

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