De Santis F, Dogeroglu T, Menichelli S, Vazzana C, Allegrini I
CNR-Istituto Inquinamento Atmosferico, Area della Ricerca di Roma, Italy.
ScientificWorldJournal. 2001 Sep 24;1:475-82. doi: 10.1100/tsw.2001.81.
A simple, cost-effective diffusive sampler is described that is suitable for measuring parts per billion (ppb) levels of ozone and nitrogen oxides. The diffusive sampler makes use of nitrite for ozone determination whereas for nitrogen oxides and nitrogen dioxide an active carbon tissue impregnated with sodium carbonate is used. Nitrate and nitrite, the formation of which is proportional to the pollutant concentration and sampling duration, are the two species analysed, respectively. Diffusion tubes have the advantage of being a low- cost, convenient way of mapping spatial distributions and investigating long-term trends of ozone and nitrogen oxides. The method is extremely useful for assessing long-term concentrations such as the annual mean for nitrogen oxides, as required by the Daughter Directive 1999/30/EC. Field tests to validate the method have been carried out at an urban background location with co-located passive samplers and continuous measurements of O3 and NOx. An application in ecological effects monitoring for ozone is also presented.
本文介绍了一种简单且经济高效的扩散式采样器，它适用于测量十亿分之一（ppb）级别的臭氧和氮氧化物。该扩散式采样器利用亚硝酸盐来测定臭氧，而对于氮氧化物和二氧化氮，则使用浸渍有碳酸钠的活性炭滤纸。硝酸盐和亚硝酸盐是分别进行分析的两种物质，它们的形成与污染物浓度和采样持续时间成正比。扩散管具有成本低、便于绘制空间分布以及研究臭氧和氮氧化物长期趋势的优点。该方法对于评估长期浓度（如1999/30/EC号子指令所要求的氮氧化物年均值）极为有用。已在城市背景地点开展了现场测试，使用了并置的被动式采样器以及对O3和NOx的连续测量，以验证该方法。本文还介绍了该方法在臭氧生态效应监测中的应用。
