Miñarro Marta Doval, Ferradás Enrique González
Chemical Engineering Department, School of Chemistry, University of Murcia, 30071 Murcia, Spain.
J Environ Monit. 2012 Feb;14(2):383-90. doi: 10.1039/c1em10601e. Epub 2011 Nov 23.
According to Directive 2008/50/EC, all equipment used for NO(x) fixed measurements must comply with the reference method or equivalent by 11 June 2013. Up to that date, non-type-approved equipment can continue to be used in air monitoring networks and will probably also be used in air pollution studies even after that date. In this context, it is advisable to know how these "old" measuring instruments respond to the requirements of European Standard EN 14211: 2005: Ambient Air Quality--Standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by chemiluminescence. In this work, we carry out a thorough performance evaluation of two commercial NO(x) analysers, both purchased before 2010, according to the mentioned Standard. Results show that water vapour interference is one of the most important disconformities with this Standard. The expanded uncertainty estimation of both analysers was below the quality objective of the above-mentioned Directive (15%); however, this calculation was performed by applying some modifications to the proposed model of Standard EN 14211. These modifications are also discussed in the paper.
根据指令2008/50/EC，所有用于固定氮氧化物测量的设备必须在2013年6月11日前符合参考方法或等效方法。在该日期之前，未经型式批准的设备可继续在空气监测网络中使用，甚至在该日期之后可能还会用于空气污染研究。在此背景下，了解这些“旧”测量仪器如何满足欧洲标准EN 14211:2005《环境空气质量——用化学发光法测量二氧化氮和一氧化氮浓度的标准方法》的要求是明智的。在这项工作中，我们根据上述标准对两台均于2010年前购买的商用氮氧化物分析仪进行了全面的性能评估。结果表明，水蒸气干扰是与该标准最主要的不符之处之一。两台分析仪的扩展不确定度估计均低于上述指令的质量目标（15%）；然而，此计算是通过对标准EN 14211提出的模型进行一些修改来完成的。本文还讨论了这些修改。
