THE PREPARATION AND CERTIFICATION OF PARTICLE SIZE REFERENCE STANDARDS

摘要

The European Community Bureau of Reference(BCR)brought out a range of crushed quartz reference standards in 1980 for particle sizing instrument calibration.These had maximum to minimum size ratios of approximately 10 to 1 and covered the size range 0.3 to 650 microns.With the exception of the largest size,which was measured by sieve analysis,all the other references were certified using the Andreasen Pipette method