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Storage stability of reduced sulfur gases in Tedlar bag sampler: Test of two different storing approaches

Tedlar-bag 시료채집법을 이용한 황화합물의 경시적 농도 변화특성: 시료의 생성방식의 차이에 따른 비교연구

  • Jo, Hyo-Jae (Department of Environment & Energy, Sejong University) ;
  • Kim, Ki-Hyun (Department of Environment & Energy, Sejong University)
  • 조효재 (세종대학교 환경에너지융합학과) ;
  • 김기현 (세종대학교 환경에너지융합학과)
  • Received : 2011.03.24
  • Accepted : 2011.03.31
  • Published : 2011.06.25

Abstract

In this study, temporal stability of 5 reduced sulfur compounds (RSCs) including ($H_2S$, $CH_3SH$, DMS, $CS_2$, 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, $H_2S$ 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 ($H_2S$, $CH_3SH$, and DMDS). The results also indicated that the temporal reduction of RSC differs greatly between light ($H_2S$ and $CH_3SH$) and heavy RSCs (DMS, DMDS, and $CS_2$). The former generally exhibited much significant reduction through time due probably to their lower stability.

Keywords

reduced sulfur compounds;temporal stability;Tedlar bag;Forward storage method;Reverse storage method

Acknowledgement

Supported by : 한국연구재단

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Cited by

  1. Comparison of Two Experimental Approaches to Test Temporal Storability of Reduced Sulfur Compounds in Whole Sampling Method vol.28, pp.3, 2012, https://doi.org/10.5572/KOSAE.2012.28.3.306
  2. A Preliminary Study on Polyester Aluminum Bag as the Possible Substitute for Tedlar Bag Sampler in RSC Analysis vol.27, pp.4, 2011, https://doi.org/10.5572/KOSAE.2011.27.4.454