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oa Routine Monitoring of Laboratory Precision and Accuracy as a Tool for Assessing Analytical Uncertainties in Large Geochemical Databases on Bulk-Rock Composition
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 18th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Apr 2025, Volume 2025, p.1 - 5
Abstract
A simple system for routine monitoring of analytical uncertainties in the creation of large whole-rock geochemical databases is considered within the framework of traditional statistical approach to analytical quality control. The anorthosite-rapakivi-granite Korosten Pluton (Ukrainian shield) was used as the object of study. A representative sets of rock samples (N=134) and standards (N=61) were analyzed in parallel multiple times (n=6-9 and n=4-136, respectively) with major and trace elements content determination via WDXRF and EDXRF. Its targeted application leads to the following results: (1) minimization of systematic bias and effective control of current analytical accuracy; (2) realistic evaluation of analytical precision for a wide range of major and trace element concentrations, as well as their detection and quantitation limits determination; (3) resulting “precision vs. element content” dependencies characterize the entire generated database as a whole, and the set of corresponding equations becomes its individual “signature”. Implementation of such monitoring-based “signatures” for newly created geochemical databases is an obligatory condition for their successful application to solve a wide range of problems in the fields of geochemical modeling and prospecting, environmental monitoring, mineral raw materials quality assessment, geochemical well logging, etc.