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Description of BS 1747-12:1993 19931.1 General This International Standard specifies a chemiluminescence method for the determination of the mass concentration of ozone in ambient air. The method is applicable to the determination of the mass concentration of ozone between 2 µg/m3 [0,001 ppm(V/V)] and 10 mg/m3 [5 ppm(V/V)] at the reference conditions of 25 °C and 101,3 kPa. Ultraviolet (UV) photometry is specified as the primary calibration method because of its proven accuracy and specificity to ozone. The use of transfer standards is allowed if they have been previously calibrated against the primary calibration method. 1.2 Limitations The chemiluminescent reaction of ozone with ethylene is not subject to interference from any of the common air pollutants. However, particulate matter, if not removed, will accumulate in the sampling line and may cause a measurable destruction of ozone. If particulate matter is allowed to enter the reaction chamber of the analyser, it will not only scatter the emitted light but will also accumulate on the optical window, thereby causing further attenuation of the emitted light. Also, any nitrogen(II) oxide in the sampled air will to some extent react with the ambient ozone; therefore, the time during which the ambient air remains in the sampling line must be sufficiently short to keep this effect to a minimum.
Gives a method for continuous or daily measurement of ozone in the range 2Gmg/m3 to 10 mg/m3.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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