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KMID : 0385520110240030212
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Analytical Science & Technology
2011 Volume.24 No. 3 p.212 ~ p.218
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Storage stability of reduced sulfur gases in Tedlar bag sampler: Test of two different storing approaches
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Jo Hyo-Jae
Kim Ki-Hyun
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Abstract
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In this study, temporal stability of 5 reduced sulfur compounds (RSCs) including (H₂S, CH₃SH, DMS, CS₂, and DMDS) was investigated up to 30 days. To learn the temporal changes in RSC concentration levels, two types of long-term storage experiment were carried out by employing two different approaches for sample storing in Tedlar bag samplers. The first one named as a forward (F) storage method consists of preparing all samples in the beginning of experiment. All these samples were analyzed sequentially through time. The second approach named as a reversed (R) storage method was carried out by preparing each sample through time and by analyzing all of them in the last day. For these experiments, RSC standards were prepared at 10 ppb in 10 L Tedlar bag. The results of both methods were consistent enough to show a tendency of the concentration reduction through time. Moreover, the lightest RSC, H₂S showed the most significant reduction of 84.8% at the end of experiment. To validate difference between these results, t-test was applied to the data obtained between the two methods at 90% significance level. According to t-test, the results of the two approaches were greatly distinguished from 3 RSCs (H₂S, CH₃SH, and DMDS). The results also indicated that the temporal reduction of RSC differs greatly between light (H₂S and CH₃SH) and heavy RSCs (DMS, DMDS, and CS₂). The former generally exhibited much significant reduction through time due probably to their lower stability.
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KEYWORD
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reduced sulfur compounds, temporal stability, Tedlar bag, Forward storage method, Reverse storage method
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