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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 New analytic method to measure the atomic weight of neon using GC-TCD

2019년 8월 29일 15시 34분 25초
ANAL.P-162 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (금요일) 11:00~12:30
Analytical Chemistry
저자 및
Jeong Eun Kim, Jin seog Kim1, Kiryong Hong1,*
Science of measurement, University of Science & Technology, Korea
1Center for Gas Analysis, Korea Research Institute of Standards and Science, Korea
The atomic weights of neon gases have been measured by means of gas chromatography with thermal conductivity detector (GC-TCD). We have employed the high purity neon (Ne) gases as the carrier and sample gases in this study, and this is differentiated with typical GC analysis. The peak signals from the gas chromatography with thermal conductivity detector (GC-TCD) appear when the thermal conductivity between the sample and carrier gases is inconsistent. In most gaseous molecules, the thermal conductivity is consistent with the same chemical species. However, the thermal conductivity of Ne gas shows the discrepancy among several manufacturers, since the relative abundance of 22Ne isotope is a quite large by ~10 % in atmospheric Ne and varies due to the mass fractionation during an air separation. We have identified the atomic weights of six Ne gases, which were used as three samples, and three references. The atomic weights of three Ne samples and one carrier gas were unidentified in the past, and in case of other three Ne references, the absolute isotope ratios were previously reported. We have performed the linear regression using GC peak areas of three references to determine the atomic weights of Ne samples. The atomic weights of three Ne samples results from linear regression were 20.1789 (2), 20.1802 (2) and 20.1828 (2) g mol-1, respectively. To verify the atomic weights results from GC-TCD measurements, the absolute isotopic ratios of all Ne gases were measured by using the magnetic section-type gas/mass spectrometer. The atomic weights of the seven Ne gases, including the carrier gas, were compared with those results from GC-TCD and the GC-TCD results were well agreement within the expanded uncertainty (k = 2).