A Simple Diffuse Reflectance Fourier Transform Infrared Spectroscopic Determination of Sulfur Dioxide in Ambient Air Using Potassium Tetrachloromercurate as the Absorbing Reagent

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Abstract:

This paper presents development of a simple, rapid, and precise analytical method for determination of sulfur dioxide in ambient air by a gas to solid-phase conversion method. Sulfur dioxide is determined in the form of sulfite (SO3 2) because the absorbing reagent, potassium tetrachloromercurate (TCM), used in this method absorbs sulfur dioxide from the atmosphere in the form of sulfite. Determination of submicrogram levels of sulfur dioxide was based on the selection of a quantitative analytical peak at 495 cm1 among the 3 observed vibrational peaks for the dichlorosulfitomercurate complex formed after reaction of sulfur dioxide with TCM and measurement of absorbance using diffuse reflectance Fourier transform infrared spectroscopy. The limits of detection and quantification of the method were found to be 0.09 and 0.4 g/g SO3 2, respectively. The precision in terms of standard deviation and relative standard deviation (RSD) at a level of 2 g SO3 2/0.1 g KBr for n = 10 was found to be 0.036 g SO3 2 and 1.8%, respectively. The RSD (n = 10) for determination of sulfur dioxide in ambient air was observed to be in the range of 2.74.2%. The method proposed is time saving and eliminates the slow and cumbersome steps of pH maintenance of the reaction mixture and color formation of the U.S. Environmental Protection Agency recommended West and Gaeke spectrophotometric method and other methods for quantitative determination of sulfur dioxide.

Document Type: Research Article

Affiliations: 1: Pt. Ravishankar Shukla University, School of Studies in Chemistry, Raipur-492 010, Chhattisgarh, India. 2: National Institute of Technology, Raipur, Chhattisgarh, India. 3: Kobe Institute of Health, 4-6, Minatojima-Nakamachi, Chuo-ku, Kobe-shi, Hyogo 650-0046, Japan. 4: Government Post Graduate College Ambikapur, Chhattisgarh, India. 5: Wuhan Environmental Protection Academy of Sciences, Xinhuaxialu 12, Wuhan City, Hubei Prefecture, People's Republic of China.

Publication date: July 1, 2007

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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