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Confirming Results

• Most methods prescribe some avenue for confirming calibrations, be it a 2 nd source check solution or single element solutions for individual analytes • Standard addition can assist with confirming interferences.

Solutions

• Contact the CRM provider for guidance • Compare stored standards to freshly prepared standards • Confirm with single-element comparisons/standard addition • Double-check any calculations involved • Verify the identity of Stock standard (matrix, density, etc.)