NDLI: A physicochemical model of sorption processes in NO2 passive sampling with air humidity effects

Content Provider	Springer Nature Link
Author	Poddubny, V. A. Yushketova, N. A.
Copyright Year	2012
Abstract	Aqueous triethanolamine (TEA) solutions are widely used as sorption medium for passive sampling of ambient NO2, with NO2 trapped and accumulated as nitrite ion. The results of test measurements of ambient NO2 concentrations using passive sampling method showed that the simple approach commonly used to describe passive sampling process might lead to substantial systematic errors. Presented in the article is a new physicochemical model of the process of passive sampling of gaseous NO2, with aqueous TEA solution used as a trapping medium. The model is based on the available results of experimental studies of interaction of gaseous NO2 with TEA/water solutions. The key principles underlying the model are: (1) when absorbed by a trapping solution, NO2 forms nitrite ion only on the condition that TEA is hydrated; (2) coefficient of conversion of NO2 to NO 2 − is equal to one when reacting with hydrated TEA; and (3) the fraction of hydrated TEA molecules depends on air humidity at the moment of measurement. Validation of the model was made using the data of the field measurements carried out in the Middle Urals in 2007–2009. The new model was used to calculate average NO2 concentrations. Concentrations calculated agreed well with the results obtained by reference methods. The difference between the datasets was statistically insignificant.
Starting Page	3819
Ending Page	3829
Page Count	11
File Format	PDF
ISSN	01676369
Journal	Environmental Monitoring and Assessment
Volume Number	185
Issue Number	5
e-ISSN	15732959
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrogen dioxide Air pollution monitoring Passive sampling Diffusion tube Aqueous triethanolamine solution NO2/NO 2 – conversion Physicochemical model Environmental Monitoring/Analysis Environmental Management Ecotoxicology Atmospheric Protection/Air Quality Control/Air Pollution Ecology
Content Type	Text
Resource Type	Article
Subject	Pollution Medicine Management, Monitoring, Policy and Law

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