Laserfiche WebLink
analysis procedures and to evaluate potential matrix interference. Matrix <br /> interference is defined as the effect of the sample matrix on the precision of the <br /> extraction and/or analysis procedure. These effects may bias the sample results <br /> either high or low. <br /> MS or MSD samples are prepared by adding a known quantity of the target <br /> analyte(s) to a sample. The samples are then extracted and analyzed as a typical <br /> environmental sample and the results are reported as a percent recovery. <br /> Spike analysis result-original sample concentration <br /> �/oRecovery= }{ 100°/0 <br /> Concentration of spike addition <br /> Duplicate analyses are performed by the laboratory to evaluate the precision of <br /> analytical procedures. The laboratory performed LCSD analyses. Precision is <br /> evaluated by calculating a relative percent difference (RPD) using the following <br /> equation: <br /> Spike Concentration— Spike Duplicate Concentration <br /> RPD%= l p p px 100% <br /> 2(Spike Concentration+ Spike Duplicate Concentration) <br /> The RPD results for all analytes were within the QC control limits. Sample results <br /> for the QC batch were accepted by the lab based on the percent recoveries <br /> and/or other acceptable QC data. The RPD and/or percent recovery for all quality <br /> control samples were within acceptable limits. <br /> - E-2 - <br />