工作场所环境.极细微气溶胶/纳米气溶胶特征描述.利用微分电气流动分析系统进行粒度分布和计数浓度测定

[中文适用范围]： 本国际标准提供了使用迁移率粒径分析仪（也称为微分迁移率分析仪）测定超细气溶胶和纳米气溶胶的数量浓度和粒径分布的指南。 仅考虑气溶胶的颗粒部分。 对于超细气溶胶和纳米气溶胶，数量和表面积浓度等暴露指标非常重要。 该国际标准还提供了确定工作场所超细气溶胶和纳米气溶胶暴露的指南。 具体来说，讨论了现在可以从多个供应商处获得的差分迁移率分析系统（DMAS）。 涵盖了操作原理、工作场所环境中的采样问题、校准、设备维护、测量不确定度和测量结果报告。 描述了在确定限值并进行合规性测量时需要解决的潜在问题和限制。 [外文原描述]： ISO 28439:2011 provides guidelines for the determination of the number concentration and size distribution of ultrafine aerosols and nanoaerosols by use of mobility particle sizers (also called differential mobility analysers). Only the particle fraction of the aerosol is considered. For ultrafine aerosols and nanoaerosols, exposure metrics such as the number and surface area concentration are important. ISO 28439:2011 also gives guidelines for the determination of workplace exposure to ultrafine aerosols and nanoaerosols. Specifically, the differential mobility analysing system (DMAS), now available from several vendors, is discussed. Principles of operation, problems of sampling in the workplace environment, calibration, equipment maintenance, measurement uncertainty, and reporting of measurement results are covered. Potential problems and limitations are described, which need to be addressed when limit values are fixed and compliance measurements carried out.