Abstract

Field-based methods for the analysis of respirable crystalline silica are now possible with the availability of portable instrumentation. Such methods also require the use of cassettes that facilitate direct-on-filter analysis of field samples. Conventional sampling cassettes can be modified such that they are amenable to direct-on-filter analysis while remaining compatible with common respirable dust samplers. The required modifications are described herein, and one version of such an analysis-ready cassette is described and evaluated in comparison to more traditional cassette designs. The novel cassette was found to result in a slightly higher mass of collected respirable material (for the same sampling duration), though this is likely due to the conductive material of the cassettes, which prevents particle wall losses in comparison to the more commonly used styrene cassette material. Both types of cassettes demonstrated comparable predictability in terms of respirable crystalline silica in a sample.

摘要

借助便携式仪器，现在可以使用基于现场的方法来分析可吸入结晶二氧化硅。这种方法还需要使用便于对现场样品进行直接过滤分析的盒。可以修改传统的采样盒，使其适合直接过滤器分析，同时保持与常见的可吸入粉尘采样器兼容。本文描述了所需的修改，并且与更传统的盒设计相比，描述并评估了这种分析就绪盒的一个版本。发现新型盒式磁带会导致收集的可吸入材料质量稍高（在相同的采样持续时间内），尽管这可能是由于盒式磁带的导电材料，与更常用的苯乙烯盒式材料相比，可防止颗粒壁损失。两种类型的暗盒在样品中的可吸入结晶二氧化硅方面表现出相当的可预测性。