LERPCLigand-Exchange Reagent Performance Check
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Along with the analysis of the field samples, each laboratory performed all required QC analyses, including initial calibration; calibration verification; determination of initial precision and recovery; blank analysis; determination of ongoing precision and recovery (OPR); determination of matrix spike recovery and matrix spike duplicate recovery (MS/MSD) in each sample type; and assessment of recovery of cyanide as Hg[(CN).sub.2] spiked into samples (ligand-exchange reagent performance check or LERPC).
Criteria were developed for initial precision and recovery (IPR), OPR, and recovery of cyanide as Hg[(CN).sub.2] spiked into reagent water samples (LERPC).
Criteria for this LERPC test were developed according to the same procedure as for the IPR test.