Abstract
The method of applying passive diffusive samplers for research on air quality is simple, easy enough and requires no electricity. The operating principle of almost all passive samplers is based on chemical reactions taking place on absorbent (impregnated filter or grid). The pollutant absorption mechanism is based on passive diffusion through the gas diffusion layer to absorbent. The diffusion process can be explained by first Fick’s law described as a free movement of gases from the ambient air to a passive sampler. This movement depends on pollutant gradient. The aim of this paper is to analyse the influence of an impregnating solution on the efficiency of diffusive samplers. The object of the study covers the triethanolamine (TEA) aqueous solutions of 5%, 10%, 20%, 30% and 50%. The results obtained showed that 30% and 50% aqueous solution gave 68% and 89% relative error making the true meaning of the oxides of nitrogen analyzer testimony. Data on the passive samplers impregnated with TEA aqueous solutions having concentrations of 5%, 10% and 20% are within definite 25% uncertainty established by the European Union Directives.
Highlights
Indication and standard deviations of diffusive samplers impregnated with 10 % and 20 % aqueous TEA solutions and average NO2 concentration measured with analyzer centracijas, nes 50 % koncentracijos impregnavimo tirpalas lėmė gerokai mažesnes azoto dioksido koncentracijas nei nuolatinio matavimo prietaisas
3. Tyrinėti 10 % ir % vandeniniai TEA tirpalai taip pat parodė vidutinę % santykinę paklaidą, o tai yra mažiau nei leistina pagal Europos Sąjungos direktyvą (2008/50/EB) neapibrėžtis – 25 %, nustatant koncentraciją indikatoriniu metodu
Summary
Tyrimų objektas – skirtingų koncentracijų trietanolamino (TEA) vandeniniai tirpalai azoto dioksidui nustatyti pasyviaisiais kaupikliais. Kad 30 % ir 50 % vandeniniai tirpalai lemia 68 % ir 89 % santykines paklaidas, tikrąja azoto dioksido reikšme laikant analizatoriaus rodmenis. 5 %, 10 % ir 20 % koncentracijų TEA vandeniniais tirpalais impregnuotų pasyviųjų kaupiklių tyrimų rezultatai neviršijo Europos Sąjungos direktyvoje nustatytos 25 % neapibrėžties, nustatant azoto dioksido koncentraciją indikatoriniais metodais. Apskaičiuota azoto dioksido koncentracija ore yra tiesiogiai proporcinga kaupiklio viduje sukauptam nitrito kiekiui: C = m⋅l , (1)
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