극미량 휘발성유기화합물질의 기체상 표준시료 조제와 열탁착분석방식에 기초한 분석안정도의 평가

Abstract

In this study, an attempt was made to measure uncertainties involved in the VOC analysis for the VOCworking standards prepared by a dilution technique using Tedlar bags. For this purpose, VOC standard gases.ofbenzene, toluene, xylene, and styrene were prepared at four different concentrations (4, 8, 20, and 40 ppb). Thesestandard samples were then loaded on to the GC system equipped with air server/thermal desorption (AS/TD)system. Each of these four standard concentrations was analyzed individually to derive their respective calibrationresults. These calibration data sets were then compared across four diferent compounds. According to thiscomparison, diferences in calibration patterns were moderately insignificant within the selected concentration rangeinvestigated simultaneously. The results of our study suggest that the analytical uncertainty associated with thepreparation of VOC starndard gas using a dilution technique can be assessed in a fairly reasonable manner forsamples with a narrow concentration range.