本文件提供了在混合粉尘工业制造环境中收集的空气样品中按尺寸定量和识别炭黑和/或无定形二氧化硅颗粒的空气浓度（颗粒数/cm3）的指南。 该方法适用于用电动低压级联冲击器（ELPCI）收集的空气样品。在25mm聚碳酸酯基底上。该方法适用于制造环境中的采样，其中存在对整体大气有贡献的各种颗粒类型。该方法仅适用于化学和物理上不同颗粒对气溶胶有贡献的环境，或者当混杂物可以控制时（例如柴油源）。其他取样方法也可以是合适的，尽管本文档限于描述与电低压级联冲击器相关联的方法。通过TEM和EDS分别分析用电动低压级联冲击器收集的样品的颗粒形态和元素组成，以允许通过类型识别颗粒。然后将该信息与由电低压级联冲击器确定的按尺寸范围划分的颗粒浓度一起使用，以确定按尺寸划分的目标材料的浓度。

This document provides guidelines to quantify and identify air concentration (number of particles/cm³) of particles of carbon black and/or amorphous silica by size in air samples collected in a mixed dust industrial manufacturing environment. The method is defined for air samples collected with an electrical low pressure cascade impactor (ELPCI). on a 25 mm polycarbonate substrate. The method is suitable for sampling in manufacturing environments where there are a variety of particle types contributing to the overall atmosphere. This method is applicable only to environments with chemically and physically distinct particles contributing to aerosols or when confounders can be controlled (e.g. diesel sources). Other sampling methods can also be suitable, though this document is limited to describing methods associated with the electrical low pressure cascade impactor. Samples collected with the electrical low pressure cascade impactor are analyzed via TEM and EDS to for particle morphology and elemental composition, respectively, to permit identification of particles by type. This information is then used, in conjunction with particle concentration by size range, as determined by the electrical low pressure cascade impactor, to determine concentration of the materials of interest by size.