In this paper we used Na₂CO₃-impregnated silica as reactive substrate for the determination of atmospheric NO_x (NO+NO₂) by using a passive sampling device, with radial symmetry, which is unprecedented. We conducted laboratory and field tests at an urban setting, with co-located passive samplers and continuous measurements of NO_x by a chemiluminescence detector, used as reference. The performance of the carbonate-based sorbent for the NO_x sampler was evaluated in two different time frames (autumn 2016 and winter 2017), characterised by different environmental conditions. The comparison of the NO_x concentration levels measured by passive sampling, using Na₂CO₃ as NO_x sorbent, showed a close relationship with those obtained by the chemiluminescence analyzer. Validation experiments in the laboratory and in the field are reported together with the calculation of the diffusion-sampling rate of the samplers.

在本文中，我们使用Na ₂ CO ₃浸渍的二氧化硅作为反应性底物，采用径向对称的无源采样装置测定大气中的NO _x（NO + NO ₂），这是前所未有的。我们在城市环境中进行的实验室和现场试验，用共同定位被动采样和NO的连续测量_X通过化学发光检测器，作为参考。在两个不同的时间范围（2016年秋季和2017年冬季）中，以不同的环境条件为特征，评估了基于碳酸盐的吸附剂对NO _x采样器的性能。的NO的比较_X使用Na通过被动采样测得的浓度水平，₂ CO ₃作为NO _X吸附剂，显示出与由所述化学发光分析仪获得的那些密切的关系。报告了实验室和现场的验证实验以及采样器扩散采样率的计算。