ISO 10473:2000 环境大气 过滤介质上颗粒物质质量的测定 Beta射线吸收法.

标准编号：ISO 10473:2000

中文名称：环境大气 过滤介质上颗粒物质质量的测定 Beta射线吸收法.

英文名称：Ambient air — Measurement of the mass of particulate matter on a filter medium — Beta-ray absorption method

发布日期：2000-04

标准范围

本国际标准描述了一种测量环境中颗粒物质量的方法空气，并且基于颗粒物对β射线的吸收。该方法适用于测定从每立方米几微克到几微克的浓度城市、农村或工业区大气中每立方米的毫克数。该方法的质量检测下限通常为15 μ g至30 μ g沉积质量/平方厘米过滤器的表面积S。这意味着，对于3小时的采样时间t和1 m3/h的流速q，浓度检测限范围为5 μ g/m3至10 μ g/m3，计算如下:取样技术不包括在本国际标准的范围内。注:颗粒物的浓度是通过除以过滤带或单个颗粒上沉积的质量来计算的过滤器，通过已知体积的空气取样。然而，浓度取决于所使用的取样技术，例如，进样口的设计。通常，对于环境空气颗粒采样，大颗粒通过尺寸选择性过滤掉入口（例如级联冲击器或旋风过滤）。粒度极限由取样头。

This International Standard describes a method for the measurement of the mass of particulate matter in ambientair 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 fewmilligrams per cubic metre contained in the atmospheres of urban, rural or industrial areas.The lower mass detection limit of the method is usually 15 μg to 30 μg of deposited mass per square centimetre ofsurface area, S, of the filter. This means, for a sampling time t of 3 h and a flowrate q of 1 m3/h, that theconcentration detection limit ranges between 5 μg/m3 and 10 μg/m3, computed as follows:

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 individualfilter, 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 sizeselectiveinlet (for example cascade impactor or cyclone filtration). The particle size limit is defined by the characteristics of thesampling head.

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