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유도결합 플라스마 질량분석기를 이용한 담배 제품의 무기물 반정량 분석
조성일,김효근,황건중,Cho, Sung-Eel,Kim, Hyo-Keun,Hwang, Keon-Joong 한국연초학회 2009 한국연초학회지 Vol.31 No.2
Semiquantitative analysis by ICP-MS has proven to be a powerful tool for fast screening, in addition, it does not require the element of interest to be present in the calibration standard, making it especially useful for the analysis of unknown samples. In this study, seven cigarette samples were analyzed by the rapid semi-quantitative analysis method based on the ICP-MS. For each cigarette sample, cut tobacco, cigarette paper, filter (before and after smoking), and smoke condensate were analyzed. The accuracy of the analysis technique was evaluated by comparing results obtained from Calibration Check Standard(CCS) and calibration method. Relative Percentage Error(RPE) value of all elements measured for three CCS showed a stable result of less than ${\pm}20%$. Compared to full quantitative analysis by calibration method, the results for cigarette samples showed average error within ${\pm}15%$.
Determination of Cadmium Transfer Rate from the Tobacco to Cigarette Smoke
Song, Mi-Young,Cho, Sung-Eel,Kim, Do-Yeon,Bock, Jin-Young,Hwang, Keon-Joong The Korean Society of Tobacco Science 2010 한국연초학회지 Vol.32 No.1
Tobacco plants absorb cadmium from soil and accumulate it in high concentrations in their leaves. Additionally, a significant portion of the cadmium contained in cigarettes passes into the smoke. Cadmium is known to be a toxic and carcinogenic compound that has harmful effects on the human body due to smoking. In this study, the concentrations of cadmium in the Ky3R4F reference cigarette and two commercial cigarettes were analyzed by inductively coupled plasma mass spectrometry. Each cigarette sample was partitioned into a tobacco rod and filter and then analyzed in order to determine the concentration of cadmium. The concentrations of cadmium in the mainstream smoke, ash, residue, and cigarette butt were also analyzed after the cigarettes were smoked under ISO smoking conditions. Transfer rates of the cadmium from the tobacco rod to the mainstream smoke, ash, and cigarette butt were 0.8 ~ 5%, 17 ~ 22%, and 5 ~ 7%, respectively. As a result, we estimated that the sidestream smoke contained about 70% of the cadmium from the tobacco rod.
ORS-ICP-MS를 이용한 담배 연기의 중금속 성분 분석
조성일,지상운,황건중,Cho, Sung-Eel,Ji, Sang-Un,Hwang, Keon-Joong 한국연초학회 2008 한국연초학회지 Vol.30 No.1
In this study, we compared three different pretreatment methods, such as block digestion, microwave digestion and solvent injection, coupled with Octopole Reaction System(ORS)-ICP-MS was used for the quantification of heavy metals in mainstream smoke of 2R4F reference cigarette, and then evaluated those efficiencies in the recovery, repeatability and reproducibility. In all methods, volatile heavy metals, As, showed the highest CV value, and Cd showed the lowest one. However, the solvent injection method showed the most stable recovery rate and CV value of 2.36 %. This method showed also advantages in time-consuming and compatibility with ICP-MS system. This results demonstrate that solvent injection method can be recommended as a superior pretreatment procedure to be able to reduce contaminants and spectral interference as well as loss of the elements interested.
정한주,조성일,양진철,Chung, Han-Joo,Cho, Sung-Eel,Yang, Jin-Chul 한국연초학회 2010 한국연초학회지 Vol.32 No.2
In the chemical, mineral and electronics, mechanically stirred tanks are widely used for complex liquid mixing processes. The paper present results from a computational fluid dynamics (CFD) model for the mixing tank in casing process. We used CFD software, FLUENT(Fluent, Inc, Lebanon, NH, version 6.2). A species transport model was used to model the problem. The flow patterns in a mixing tank, 1.6 m in diameter and 2.0 m in height, were studied using CFD. Numerical analysis results show that improved mixing tank was reduced low speed flow region and turbulent region in internal flow of mixing tank.
조성일,김미주,지상운,김용하,민영근,Cho Sung-Eel,Kim Mi-Ju,Kim Sang-Un,Kim Yong-Ha,Min Young-Keun 한국연초학회 2006 한국연초학회지 Vol.28 No.1
This study was carried out to improve and evaluate the analytical method for determination of potassium in tobacco leaf by various pre-treatment techniques. The time requirment of various pre-treatments was about 10 hour for dry ashing and 6 hour for microwave digestion and 3 hour for sonication. The results of recover in both pre-treatment techniques, microwave digestion and sonication, is greater than 85 % stably with reproducibility(RSD %) on replicates of less than 3 %. However the mean values for microwave digestion were lower than certified standard value of NlST SRM. Compared to the other pre-treatment techniques, analytical results for sonication technique strictly improved the accuracy and precision. In conclusion, the use of the simple sonication technique seems to be efficient for the determination of potassium in tobacco leaf in consideration for both the accuracy and reproducibility.
담배 연기 중 휘발성 유기물질 분석에 대한 측정 불확도 산출
가미현,조성일,김미주,이철희,지상운,정종수,김용하,민영근,Ka, Mi-Hyun,Cho, Sung-Eel,Kim, Mi-Ju,Lee, Chul-Hee,Ji, Sang-Un,Jeong, Jong-Soo,Kim, Yong-Ha,Min, Young-Keun 한국연초학회 2006 한국연초학회지 Vol.28 No.2
A measurement uncertainty for analysis of volatile organic compound (benzene) in cigarette mainstream smoke was carried out. In this study one point re-calibration method was used to estimate uncertainty for benzene. The measurement uncertainty was calculated based on the uncertainty sources of each analysis step, quality appraisal sources, drift and repeatability. As a result, the concentration and expanded uncertainty of benzene in cigarette mainstream smoke were measured as $38.08{\pm}4.36{\mu}g/cig$. Relative uncertainty of drift and repeatability obtained were 5% and 3%, respectively.
두 점 교정법을 이용한 담배 연기 성분 중 니코틴 분석 결과에 대한 불확도 평가
김미주,지상운,황건중,이문수,조성일,Kim Mi-Ju,Ji Sang-Un,Hwang Keon-Joong,Lee Moon-Soo,Cho Sung-Eel 한국연초학회 2004 한국연초학회지 Vol.26 No.2
Uncertainty of final measurement results considering main uncertainty sources being in nicotine of mainstream smoke was estimated. This study was accomplished by using the ISO 'The Guide to the Expression of Uncertainty in Measurement'. Using the two point re-calibration method, uncertainty for nicotine concentration was calculated considering the uncertainty sources of each step. The concentration and uncertainty of nicotine in mainstream smoke was estimated as $153.95{\pm}17.84\;{\mu}g/mL\;(0.77\pm0.089 mg/cig)$. The expanded uncertainty was $17.84 {\mu}g/mL(\pm0.089 mg/cig).$ The reported expanded uncertainty of the measurement is stated as the standard uncertainty of measurement multiplied by a coverage factor of 2, which for a normal distribution corresponds to a coverage probability of approximately $95\%$ The former expression indicates the conversion concentration into the sample.