Autor: Mikuška, P.; Motyka, K.; Večeřa, Z.
Název práce v češtině: Stanovení kyseliny dusité ve vzduchu pomocí kombinace difúzního denuderu se stékajícím filmem kapaliny a FIA
Název práce v angličtině: Determination of nitrous acid in air using wet effluent diffusion denuder–FIA technique
Studentská publikace: ne

Klíčová slova v angličtině: nitrous acid, wet effluent diffusion denuder, flow-injection analysis, monitoring
Abstrakt česky: V publikaci je popsáno citlivé a rychlé stanovéní kyseliny dusité (HONO) ve vzduchu. Metoda je založena na kontinuální prekoncentraci HONO v cylindrickém difúzním denuderu se stékajícím filmem kapaliny a následné on-line detekci HONO v koncentrátu pomocí chemiluminiscenční FIA metody.
Abstrakt anglicky: A sensitive and fast method for the determination of nitrous acid (HONO) in air is described. The method combines a continuous collection of nitrous acid into a thin film of absorption liquid in a cylindrical wet effluent diffusion denuder (CWEDD) and on-line analysis of collected nitrous acid at the denuder concentrate employing a flow-injection analysis (FIA) where nitrous acid is oxidized into peroxynitrous acid and a chemiluminescent light emitted during the reaction of peroxynitrite with luminol is detected. Various absorption solutions carbonate, bicarbonate, phosphate) aswell as deionizedwaterwere compared from point of view of collection efficiency of nitrous acid at the CWEDD and selectivity and sensitivity of nitrous acid determination in air. All tested liquids provide quantitative collection of HONO in the CWEDD at the air flowrate of 1 L min−1. The detection limit of nitrous acid of 15 ppt (v/v) is the same for all tested liquids. Small positive interference of nitrogen dioxide and peroxyacetylnitrate has been found. The lowest interference ofNO2 was found for 1×10−4MNaHCO3 (pH 6.4; 0.18%) while for deionized water interference of NO2 (0.28%) was slightlyhigher. The lowest interference of peroxyacetylnitratewas found for deionizedwater (1.46%).No enhanced formation of HONO inside the cylindrical wet effluent diffusion denuder was observed for simultaneous bringing of nitrogen dioxide together with phenol, p-cresol, guaiacol, catechol, o-nitrophenol as well as with n-octane, n-nonane, n-decane, isoprene, -pinene, -pinene, camphene, 3-carene, -phellandrene,S-limonene, benzene, toluene or o-xylene in comparison with formation of HONO only in the presence NO2. Deionized water was chosen as the optimum absorption liquid for the sampling of atmospheric nitrous acid a““
Jazyk v originále: english
Název časopisu: Talanta
Rok: 2008
Svazek (ročník): 77

Strana od-do: 635-641

Q1: ne