A Matrix Spike and Spike Duplicate (MS/MSD) are representative but randomly chosen client samples that have known concentrations of analytes of interest added to the samples prior to sample preparation and analysis. They are processed along with the same un-spiked sample. The purpose of the MS/MSD is to document the accuracy and precision of the method for that specific sample. Control charts are maintained that are indicative of typical MS/MSD recoveries of ‘real’ samples rather than laboratory controlled samples.
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