A Comparison of International Silica (α-quartz) Calibration Standards by Fourier Transform- Infrared Spectrophotometry

摘要

Seven international silica (α-quartz) standards were examined for relative purity to the US National Institute of Standards and Technology(NIST) Standard Reference Material(SRM) 1878 Respirable α-quarta by Fourier Transform-Infrared Spectrophotometry (FT-IR). The standards examined have been used in North America, the UK, Australia and Germany. The 189 samples analyzed included NIST-SRM 1878, Min-U-Sil 5, Ottawa Silica Sand, Sikron F- 600, A9950(AUST 1), DQ12-Robock, DQ12-Bergbau. Size distributions of the standards were determined by Coulter Counter to be broadly similar with equivalnt spherical volume median diameter ranging between 1.2 and 3μm.