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ISSN 2029-7092 online
ISBN 978-609-457-690-4 CD
ISBN 978-609-457-640-9
 Environmental Protection

Janina Tarvydaitė, Agnė Kazlauskienė

Research of effectiveness of diffusive samplers determining nitrogen dioxide in air

Conference Information: 9th International Conference on Environmental Engineering, MAY 22-23, 2014 Vilnius, LITHUANIA
Source: ICEE-2014 - International Conference on Environmental Engineering
Book Series: International Conference on Environmental Engineering (ICEE) Selected papers
ISSN: ISSN 2029-7092 online
ISBN: 978-609-457-640-9 / 978-609-457-690-4 CD
Year: 2014
Publisher: Vilnius Gediminas Technical University Press Technika

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Passive samplers are widely used for ambient air monitoring because of low-cost, convenient way for mapping spatial distributions and ability to investigate long term trends of nitrogen dioxide (NO2). During investigations there are used passive diffusive tubes which are capable to take the samples of gases from the atmosphere at a rate controlled by gaseous diffusion through a static air layer but do not involve the active movement of air. Gasses diffuse along a sampler onto impregnated filter or mash with absorbing or adsorbing medium. In this research three different absorbents were selected: 10% of TEA (triethanolamine) diluted in water, 10% of TEA diluted in acetone and potassium iodide (KI) with sodium hydroxide (NaOH). Passive samplers with these solutions have been used for experimental research, which was carried out under field conditions in the roadside of district road with composed cross-sections. The results have shown that samplers impregnated with 10% of TEA diluted in water reveals the greatest accuracy in comparison of NO2 measuring results near automatic air monitoring station (AMS). According to the precision, both 10% of TEA diluted in water and 10% of TEA diluted in acetone comply with the Directive 2008/50/EC requirement for uncertainty (< 25%).

Keywords: Passive samplers; triethanolamine; nitrogen dioxide; potassium iodide; sodium hydroxide.

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