2019-8-9

 

ISSN 0536-1028 (Print)              ISSN 2686-9853 (Online)  
УДК 622.7.09 DOI: 10.21440/0536-1028-2019-8-81-87 Download

Stupakova E. V. Reproducibility and repeatability of measurement results and their application when calculating the errors of ore and concentrates samples preparation and analysis. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 8: 81–87 (In Russ.). DOI: 10.21440/0536-1028-2019-8-81-87

АННОТАЦИЯ

Introduction. Well-known formulae make it possible to analytically calculate the random error of mass-reduction at samples preparation and their preparation for analysis, which is also true for weighted samples collection for analysis; it helps to calculate, analyze and optimize the circuits of samples preparation, including reference standards preparation. All these values can be determined by means of direct measuring, but the performer’s qualifcation cannot be taken into account.
Research aim is to determine and test the sample reduction error formula coefcient which takes into account the quality of performers work at sampling.
Research methodology. For experimental evaluation of performance quality, gold and silver side-by-side assays of gold concentrate in two independent laboratories were carried out, which allow determining the repeatability error by duplicate analysis. The comparison was carried out of the two laboratories’ work on random repeatability errors determination.
Results. It has been proposed to use the coefcient of the performer’s work quality when calculating random errors of samples preparation for analysis. Coefcient’s application is shown by the example of gold-bearing product preparation circuit design.
Conclusions. The formula which calculates the error of mass-reduction caused by the reduction of sample mass describes the procedure of ideal reduction until the quality of the performer’s work is taken into consideration. When calculating and analyzing sample preparation circuits (including weighted samples collection for analysis), the error should be taken into account, which is introduced due to the imperfect process by the performer. The ratio of reproducibility error to repeatability error in analysis procedures produces the coefcient of imperfection of performing the operation of weighted samples collection for analysis from the package, which is 1.1–1.6 for noble metal ore, and 1.2–1.4 for nonferrous metal ore. Experimental determination of sample preparation errors and their comparison with expected values make it possible to estimate the quality of laboratories’ work and take measures to improve their work.

Key words: reproducibility; repeatability; random error; samples preparation for analysis; coefcient of performance.


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Received 4 September 2019

 

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