摘要：针对油基液体颗粒计数器 (APC) 的准确校准需求, 采用重力沉降、超声筛分和扫描电子显微镜等制备及测量技术, 开展准单分散中级试验粉尘颗粒标准物质 (AM-MTD-CRM) 的研制。标准物质粒径涵盖了APC的常用测量范围, 定值不确定度小于2.5% (k=2) , 远低于现有多分散中级试验粉尘标准物质 (P-MTD-CRM) 的定值不确定度。所研制AM-MTD-CRM的定值不确定度小、粒径分布窄, 解决了P-MTD-CRM中粒径测量准确性差、大粒径范围统计颗粒数量少等问题, 使得APC校准结果不确定度得到很大改善。

关键词：液体颗粒计数器；标准物质；校准；中级试验粉尘

Abstract：For the purpose of accurate calibration for the oil-based liquid automatic particle counter (APC) , the preparation and measurement techniques such as gravity sedimentation, ultrasonic sieving and scanning electron microscope (SEM) , were used to develop the approximately-monodispersed MTD certified reference materials (AM-MTD-CRM) . The series particle size CRM cover the routine measurement range of APC, and the uncertainty of the certified value was less than 2.5% (k=2) , which was far below the uncertainty of polydisperse MTD CRM (P-MTD-CRM) . Because of the low uncertainty and the narrow particle size distribution of the AM-MTD-CRM, which overcome the difficulties of poor accuracy of particle sizing and less particle statistics for P-MTD-CRM, it makes the APC calibration uncertainty is greatly improved.

Keywords：liquid automatic particle counter；certified reference materials；calibration；medium test dust