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Content DescriptionThis International Standard specifies a photometric method for the determination of the mass concentration of nitrogen oxides in exhaust gases from ducts or chimneys. The method is applicable to the determination of the mass concentration of nitrogen oxides in exhaust gases from combustion processes, processes for surface treatment of metals and from organic chemical reactions, if necessary after removal by washing, in-furnace reduction and/or catalytic denitration, prior to their dispersion into the atmosphere. This International Standard is applicable to the concentration range 5 mg/m3 to 1000 mg/m3 as NO2 for a sample gas volume of 1000 ml. For gas concentrations greater than 1000 mg/m3, the determination of sample gas concentrations up to 5000 mg/m3can be performed by diluting the sample solution or by taking an aliquot of the sample solution. This International Standard is not applicable to the determination of dinitrogen monoxide (N2O). About ISOISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better. |
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