A Modified Method for the Determination of Sulfur Dioxide in Air

Authors

  • Tanai Chindudsadeekun Bureau of Industrial Environmental Technology, Department of Industrial Works, Bangkok
  • Pornpimol Kongtip Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University
  • Vichai Pruktharathikul Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University

Keywords:

sulfur dioxide, air sampling, analysis, spectrophotometer, triethanolamine, DTNB

Abstract

A modified method for the determination of sulfur dioxide in air used a fritted bubble impinger with triethanolamine (TEA) solution as the absorbing solution. The reaction between the fixed sulfur dioxide in TEA and 5, 5/-dithiobis (2-nitrobenzoic acid) (DTNB) produced an organic thiosulfate. Color development was complete 15 minutes after the addition of DTNB to the solution. The calibration curve was linear over a range of 0-110 μg SO2 in the 50 ml working solution. The collection efficiency of a 10 ml TEA solution in the impinger was sufficient for the collection of at least 50.8 liters of 10.0 ppm SO2 or 1,250 μg SO2. The sample storage stability at room temperature was 22 days. The recovery and coefficient of variation for the analysis of 0.5-10.0 ppm SO2 ranged from 94.9 to 110.0 % and 0.4 to 1.8 %, respectively. The modified method showed no significant difference (p>0.05) to the NIOSH method, P&CAM 160, for the analysis of air samples in the working environment of a sulfuric acid factory.

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Published

2019-05-10

How to Cite

Chindudsadeekun, T., Kongtip, P., & Pruktharathikul, V. (2019). A Modified Method for the Determination of Sulfur Dioxide in Air. Journal of Health Research, 16(2), 95–105. Retrieved from https://he01.tci-thaijo.org/index.php/jhealthres/article/view/188269

Issue

Vol. 16 No. 2: September 2002

Section

ORIGINAL RESEARCH ARTICLE