title: A simple diffuse reflectance Fourier transform infrared spectroscopic determination of sulfur dioxide in ambient air using potassium tetrachloromercurate as the absorbing reagent.
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 cm(-1) 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 microg/g SO3(2-), respectively. The precision in terms of standard deviation and relative standard deviation (RSD) at a level of 2 microg SO3(2-)/10.1 g KBr for n = 10 was found to be 0.036 microg 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 2.7-4.2%. 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.
authors.affiliation: Pt. Ravishankar Shukla University, School of Studies in Chemistry, Raipur-492 010, Chhattisgarh, India.
authors.forename: Santosh Kumar
authors.initials: SK
authors.lastname: Verma
authors.forename: Manas Kanti
authors.initials: MK
authors.lastname: Deb
authors.forename: Samir
authors.initials: S
authors.lastname: Bajpai
authors.forename: Yukio
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Shekhar Kumar
authors.initials: SK
authors.lastname: Sinha
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gong
mesh_terms: D001965:Bromides / Q000032:analysis; D002138:Calibration; D004581:Electronics; D006863:Hydrogen-Ion Concentration; D007454:Iodides / Q000032:analysis*; D017669:Mercury Compounds / Q000032:analysis*; D008956:Models, Chemical; D008962:Models, Theoretical; D017680:Potassium Compounds / Q000032:analysis; D011786:Quality Control; D015203:Reproducibility of Results; D012107:Research Design; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013447:Sulfites / Q000737:chemistry; D013458:Sulfur Dioxide / Q000032:analysis*
chemical_list: D001965:Bromides; D007454:Iodides; D017669:Mercury Compounds; D017680:Potassium Compounds; D013447:Sulfites; D013458:Sulfur Dioxide; C009009:potassium tetraiodomercurate; C039004:potassium bromide