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A physicochemical model of sorption processes in NO_2 passive sampling with air humidity effects

机译:空气湿度对NO_2被动采样吸附过程的理化模型

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摘要

Aqueous triethanolamine (TEA) solutions are widely used as sorption medium for passive sampling of ambient NO_2, with NO_2 trapped and accumulated as nitrite ion. The results of test measurements of ambient NO_2 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 NO_2, with aqueous TEA solution used as a trapping medium. The model is based on the available results of experimental studies of interaction of gaseous NO_2 with TEA/ water solutions. The key principles underlying the model are: (1) when absorbed by a trapping solution, NO_2 forms nitrite ion only on the condition that TEA is hydrated; (2) coefficient of conversion of NO_2 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 NO_2 concentrations. Concentrations calculated agreed well with the results obtained by reference methods. The difference between the datasets was statistically insignificant.
机译:三乙醇胺(TEA)水溶液被广泛用作被动采样环境NO_2的吸附介质,其中NO_2被捕获并累积为亚硝酸根离子。使用被动采样方法测试环境NO_2浓度的结果表明,通常用于描述被动采样过程的简单方法可能会导致严重的系统误差。本文介绍了一种以气态TEA溶液为捕获介质的气态NO_2被动采样过程的新物理化学模型。该模型基于气态NO_2与TEA /水溶液相互作用的实验研究的可用结果。该模型的主要原理是:(1)当被捕集溶液吸收时,NO_2仅在TEA水合的条件下形成亚硝酸根离子; (2)与水合TEA反应时,NO_2向NO_2〜-的转化系数等于1。 (3)水合TEA分子的比例取决于测量时的空气湿度。该模型的验证是使用2007-2009年在中乌拉尔地区进行的现场测量数据进行的。新模型用于计算平均NO_2浓度。计算出的浓度与通过参考方法获得的结果非常吻合。数据集之间的差异在统计学上不显着。

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