Ion chromatographic determination of nitrogen dioxide and sulphur dioxide in the atmosphere using tri-ethanolamine-potassium hydroxide-coated cartridges.
Nitrogen dioxide (NO2) and sulphur dioxide (SO2) in air were sampled by the use of a Sep-Pak C18 cartridge impregnated with triethanolamine-potassium hydroxide. The trapped NO2 and SO2 were eluted with a 8 mM sodium carbonate-3 mM sodium hydrogencarbonate solution and simultaneously determined by ion chromatography. In the active sampling mode, NO2 was determined with 5.2% relative standard deviation at 95 ppb and SO2 was determined with 2.4-5.3% relative standard deviation at 54-184 ppb. The recoveries were 85-98% for NO2 and 91-105% for SO2. In the passive sampling mode, the average concentrations of NO2 and SO2 were determined with 2.4-6.8 and 2.8-7.9% relative standard deviation, respectively, at atmospheric levels for 6-24 days.
D000395:Air Pollutants, Occupational / Q000032:analysis*; D002852:Chromatography, Ion Exchange; D004983:Ethanolamines; D006813:Humidity; D006878:Hydroxides; D009585:Nitrogen Dioxide / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis; D011188:Potassium; D017680:Potassium Compounds; D013458:Sulfur Dioxide / Q000032:analysis*
D000395:Air Pollutants, Occupational; D004983:Ethanolamines; D006878:Hydroxides; D017680:Potassium Compounds; D013458:Sulfur Dioxide; C009546:triethanolamine; D009609:Nitrous Oxide; D011188:Potassium; D009585:Nitrogen Dioxide; C029943:potassium hydroxide