A Simple and Simultaneous Measurement Method of Sulfur Dioxide and Nitrogen Dioxide in Atmosphere with Triethanolamine Cylindrical Filter Method

MATSUMOTO Mitsuhiro, MIZOGUCHI Tsuguo

doi:10.11298/taiki1978.23.85

A simple and simultaneous measurement method of sulfur dioxide (SO₂) and nitrogen dioxide (NO₂) concentration in the atmosphere was examined.<BR>The method was as follows; a paper cylindrical filter treated with 30%(v/v) triethanolamine solution (TEA-CF) set in a shelter was exposed to adsorb SO₂ and NO₂ in the atmosphere. SO₄^2- and NO₂-in an aquous extract of the TEA-CF were analyzed with a ion chromatograph. It became evident that this method was a rapid determination and an effective simple measurement of SO₂ and NO₂ concentration in the atmosphere for the month long term.<BR>Influences of meteorological factors (temperature, relative humidity and wind velocity) on this method was not noticed for measurement of SO₂. But, influences of temperature on this method described below was noticed for measurement of NO₂; the nitration rate (adsorption quantity of NO₂-to TEA-CF per 1 ppb of NO₂ concentration a day, μgNO₂/day/100 cm²/ppb NO₂) was caused 18% increase owing to 10°C rise of temperature for measurement of NO₂.<BR>By comparing data sets gained with this method to those with automated SO₂ and NO₂ analyzers, the correlation coefficients (r) and the sample numbers (n) were r=0.69 (n=200) for SO₂ and r=0.79 (n=226) for NO₂ in such case temperature correction were performed, and hence the correlation were recognized at 1% significant level. The confidence ranges of data gained with this method were ±28% for SO₂ and ±22% for NO₂ with respect to data reduced to ppb unit.

A Simple and Simultaneous Measurement Method of Sulfur Dioxide and Nitrogen Dioxide in Atmosphere with Triethanolamine Cylindrical Filter Method

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