Comparison of Fischer Assay Data Generated by Four Laboratories

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Abstract
Inter- and intra-laboratory comparison of Fischer assay data and testing of these data by correlation analysis indicate good correlation but varied amounts of scatter in the data. The scatter seems to be due to both mechanical and analytical factors; it is possible that non-uniform sample preparation is a dominant factor in causing scatter, but variable analytical results are also apparent. The range in precision of the Fischer assay data is generally small and probably does not seriously affect the accuracy of the calculated shale-oil resources. It is highly desirable to have an accurate and uniform assay method to determine the oil yield of oil shales. If inter- or intra-laboratory precision is to be maintained, it is imperative that sample preparation and analytical conditions are uniform and closely supervised.