BS EN 14907:2005
环境空气质量.悬浮颗粒物质的PM2.5质量系数测定用标准称重测量法

Ambient air quality - Standard gravimetric measurement method for the determination of the PM2,5 mass fraction of suspended particulate matter

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标准号

BS EN 14907:2005

发布

2005年

发布单位

英国标准学会

替代标准

BS EN 12341:2014

BS EN 14907:2005(2010)

当前最新

BS EN 12341:2014

BS EN 14907:2005(2010)

 

 

适用范围

This European Standard describes a standard method for determining the PM2,5 mass concentration of suspended particulate matter in ambient air by sampling the particulate matter on filters and weighing them by means of a balance. Measurements are made over a sampling period of about 24 h, and in line with the Directive, are expressed as ?g/m3, where the volume of air is the volume at ambient conditions near the inlet at the time of sampling. The range of application of the standard is from 1 ?g/m3 (i.e. the limit of detection of the standard measurement method expressed as its uncertainty) up to 120 ?g/m3 (i.e. the maximum concentration level observed during the field study undertaken by CEN/TC 264/WG 15 to validate the standard). NOTE Although the standard is not validated for concentrations over 120 ?g/m3, its range of application could well be extended to commonly encountered ambient concentrations up to circa 200 ?g/m3 when using glass or quartz fibre filters. At these high concentrations and particulate mass loadings no filter clogging is to be expected. Also the flow rate can be easily maintained at the nominal setting. The equivalence procedure in Annex A specifies two approaches, depending on whether the candidate method differs slightly or fundamentally from the standard method. In the former case, involving only slight differences from the standard method (“variations on a theme”) Annex A provides a restricted procedure to compare only the pertinent differences, instead of a full field test. This part of the annex serves to give practical guidance for determining equivalence for measurement methods commonly used in monitoring networks, and includes examples of common variations to the standard method, such as different filter storing or conditioning procedures and the variation of the standard method for the application as automated filter changer. In the latter case, involving a full set of field tests, the procedure serves to determine equivalence only within the range of conditions under which the field tests are carried out. The equivalence can be shown to hold for conditions prevailing within European countries by carrying out the field test in situations covering a suitable range of relevant ambient parameters (such as concentration and composition of the suspended particulate matter, temperature, and humidity). Although this European Standard does not explicitly address automatic monitoring methods for the measurement of the PM2,5 mass fraction in ambient air, the equivalence test procedure in Annex A applies both to non-automatic and automatic methods.

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