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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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Abstract
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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