Simultaneous Analysis of Some Composite Gases by Second Derivative Spectrophotometry

Abstract

An investigation was made on the determination of gaseous air pollutants by secondderivative absorption spectrophotometry in ultraviolet and visible regions.
The pollutants investigated in this study are as follows: SO₂, NO, NO₂, C₆H₆, C₇H₈, C₈H₁₀ and some malodorous substances such as NH₃, (CH₃) ₃N, CH₃CHO, C₈H₈ and (CH₃) ₂S.
The absorption spectra of each of the pollutants with and without the presence of other pollutants were taken and examined on the measuring condition.
A method for the simultaneous determination of SO₂, NO and NO₂ in mixed gases by using the multichannel system also investigated and satisfactory results were obtained.
The Limits of detection were 1 ppb for SO₂, 3 ppb for NO and 20 ppb for NO₂.