A review on the precision requirement for the determination of platinum-group elements.

In this paper, the specifications and requirements of testing quality management for the determination of platinum group elements in geological laboratories (ministerial standard of geological minerals) issued successively in 1972, 1978, 1988, 1994, 2002 and 2006. The change of the precision requirements for the determination of platinum group elements in those specifications is reviewed. In addition, the precision for the certification of platinum group element reference materials developed by China and the other countries in the world is statistically calculated, and finally on the basis of the above information, the precision requirements for the determination of platinum group elements and preparation of platinum group elements reference materials are discussed and the related suggestions are presented.