GSO ISO 10473:2008由GSO 发布于 2008-02-20。
GSO ISO 10473:2008在国际标准分类中归属于: 13.040.20 环境空气。
GSO ISO 10473:2008 环境空气 通过 β 吸收法测量过滤介质中颗粒物的质量的最新版本是哪一版?
最新版本是 GSO ISO 10473:2008 。
This International Standard describes a method for the measurement of the mass of particulate matter in ambient air and is based on the absorption of beta rays by the particulate matter. This method applies to the determination of concentrations ranging from a few micrograms per cubic metre to a few milligrams per cubic metre contained in the atmospheres of urban, rural or industrial areas. The lower mass detection limit of the method is usually 15 ?g to 30 ?g of deposited mass per square centimetre of surface area, S, of the filter. This means, for a sampling time t of 3 h and a flowrate q of 1 m3/h, that the concentration detection limit ranges between 5 ?g/m3 and 10 ?g/m3, computed as follows: Concentration g / cm (cm (m / h) (h) 2 2 e j 3 S q t ) 1 Sampling techniques are not included in the scope of this International Standard. NOTE The concentration of particulate matter is calculated by dividing the mass deposited on a filter tape or individual filter, by the known volume of air sampled. However, concentration is dependent on the sampling technique used, for example, the design of the sampling inlet. Normally, for ambient-air particle sampling, large particles are filtered out by means of a sizeselective inlet (for example cascade impactor or cyclone filtration). The particle size limit is defined by the characteristics of the sampling head.
工作时,空心锥形振荡管和滤膜在驱动电路的驱动下以固有频率振动,空气通过滤膜从振荡管中流过,空气中的颗粒物积累在滤膜上,改变了振荡系统的质量,从而使整个系统的固有频率发生变化,通过频率计数电路对振荡管频率的测量就可以计数出对应时间内累计的颗粒物质量的增量,通过计算可得出该段时间内的颗粒物质量浓度。 振荡天平原理的优点是实时性好,准确度高,检出限低。...
随着科技的不断更新,扬尘监测系统也在与时俱进。众所周知,目前市面上的扬尘监测仪的工作原理共分为三种:β射线法,激光散射法,震荡天平法。先来说下β射线法,当β射线照射介质时,β粒子与介质中的电子相互碰撞损失能量而被吸收,在低能条件下,吸收程度取决于介质的质量,与颗粒物粒径、成分、颜色及分散状态无关。...
流量为1m3/h环境空气样品经过PM10采样头和PM2.5切割器后,成为符合技术要求的颗粒物样品气体。 样品随后进入配置有滤膜动态测量系统(FDMS)的微量振荡天平法监测仪主机,在主机中测量样品质量的微量振荡天平传感器主要部件是一支一端固定,另一端装有滤膜的空心锥形管,样品气流通过滤膜,颗粒物被收集在滤膜上。...
β射线颗粒物监测仪可自动测量和记录浓度,采用的是β射线吸收法的工作原理,将C-14作为发射源,其发射恒定的高能量电子,样品空气通过切割器以恒定的流量经过进样管,颗粒物截留在滤膜上。β射线通过滤膜时,能量发生衰减,通过对衰减量的测定计算出颗粒物的质量,根据采样流量、采样时间和滤膜面积来计算实际状态下环境空气中颗粒物的浓度。β射线扬尘监测设备适用于建筑工地、道路施工、工厂等颗粒物的在线监测。...
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