工作场所空气.用傅里叶变换红外光谱法分析可吸入结晶二氧化硅

[中文适用范围]： 本文件规定了使用傅里叶变换红外光谱（FTIR）分析呼吸可吸入 crystalline silica (RCS) 的方法。适用于在收集底物（如滤膜或泡沫）上采集空气样品的 RCS 分析。 三种分析方法包括：a) 直接在采样滤膜上分析；b) 通过移除、处理并将灰尘重新沉积到另一个滤膜上进行间接分析；c) 将其制备成溴化钾 (KBr) 压片后进行分析。 [外文原描述]： This document is a standard for the analysis by Fourier-Transform Infrared (FTIR) of respirable crystalline silica (RCS) in samples of air collected on collection substrates (i.e. filters or foams). Three analytical approaches are described for whom the dust from the sample collection substrate is a) analysed directly on sampled filter, b) recovered, treated and deposited onto another filter for analysis, or c) recovered, treated and pressed into a potassium bromide (KBr) pellet for analysis. This document provides information on the instrumental parameters, the sensitivity of different sampling apparatus, the use of different filters and sample treatment to remove interference. In this document the expression RCS includes the most common polymorphs quartz and cristobalite. This document excludes the less common polymorphs of crystalline silica, such as tridymite. Under certain circumstances (i.e. low filter dust loads, low silica content), the analytical approach described in this method cannot fulfil the expanded uncertainty requirements of ISO 20581. Guidance for calculation of uncertainty for measurements of RCS is given in ISO 24095.