Standard Reference Material of Fluorite FM

Standard reference material of fluorite FM, consisting chiefly of fluorite, quartz and baryte, was prepared by the Institute of Mineral Raw Materials in Kutná Hora (Czechoslovakia). The homogeneity of the pulverised SRM was checked by X-ray fluorescence spectrometry from counts corresponding to the amounts of iron, copper, barium, strontium and titanium. The SRM was considered homogeneous if the "between bottles" variance was not significantly greater than the "within bottles" variance and further, if the error caused by heterogeneity of the SRM was less than one third of the error of an analytical determination carried out in a routine manner. Analytical results from 26 laboratories were processed following the recommended procedure of CMEA-countries which includes: Testing the normality of results, eliminating out-lying results and computing the arithmetic means, estimates of standard deviations and the confidence intervals of the means. Attested values for 17 components and non-attested values for 30 components and/or elements are reported.     

Information on Geochemical Standard Reference Materials of the CMGA Countries

This article provides information on the standard reference materials prepared in co-operation by the CMEA-countries. Among the standards are materials of technological or geochemical importance - silicates, carbonates, ores, etc. The article briefly mentions the technology of their preparation, homogeneity control, analyses evaluation and certification used for these materials. It surveys the finished and planned SRM's. The last table gives the names of foreign trade companies in the individual CMEA-countries which are entrusted with the sale of the standard reference materials produced in that particular country.