Development of Evaluating Method for Airborne Manufactured-Nanomaterials in Work Environment

纳米材料，如碳纳米管和富勒烯，作为工业材料具有许多有益的特性，但也有暴露于这些纳米材料的风险。为了安全生产和处理这些纳米材料，重要的是进行风险评估，包括危害评估和暴露评估。作为暴露评估的一部分，我们使用气溶胶碳分析仪进行了碳质纳米材料的鉴定和量化实验。以单质碳（EC）浓度为基础，对几种类型的多壁碳纳米管（MWCNT）和其他碳质纳米材料（如单壁碳纳米管（SWCNT））以及环境颗粒物进行了分析。使用Sioutas级联冲击器（SCI）对一定体积的工作场所空气取样呼吸性粉尘。SCI可以收集5种气动直径的粒径分离颗粒。样品颗粒中的EC是通过碳分析来测定的。通过实际工作环境的数据验证了该方法的有效性。

Nanomaterials such as carbon nanotubes and fullerenes have many beneficial characteristics as industrial materials, but also have risk on exposure to these nanomaterials. For safe production and handling of these nanomaterials, it is important to conduct a risk assessment that includes hazard assessment and exposure assessment. As part of the exposure assessment, we conducted experiments to qualify and quantify carbonaceous nanomaterials using an aerosol carbon analyzer. Several types of multi-walled carbon nanotubes (MWCNT) and other carbonaceous nanomaterials, such as single-walled carbon nanotubes (SWCNT), and ambient particulate matter were analyzed by this method on the basis of the elemental carbon (EC) concentration. Respirable dust is sampled using a Sioutas cascade impactor (SCI) for a certain volume of workplace air. The SCI can collect size-segregated particles having 5 kinds of aerodynamic diameters. EC in sampled particles are determined by the carbon analysis. The validity of this method was also confirmed by data of real work environment.