Relative percent difference laboratory data
[DOC File]NC DENR/DWQ LABORATORY CERTIFICATION
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32 What is the acceptance criterion for LFM/LFMD relative percent difference? [SM 4020 B-2011 (2) (g)] [SM 1020 B-2011 (8] Lab must set acceptance criteria SM 1020 B. (8) states: Evaluate LFM duplicate results for precision and accuracy.
[DOCX File]Table of Contents
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A data quality indicator, precision measures the level of agreement or variability among a set of repeated measurements, obtained under similar conditions. Relative percent difference (RPD) is an example of a way to calculate precision by looking at the difference between results for two duplicate samples.
[DOC File]Parameter
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M Laboratory matrix spike recovery was outside of acceptable limits for the associated method. N Duplicates: (RPD) Relative Percent Difference exceeds the laboratory control limit for laboratory matrix duplicates or matrix spike duplicates. P Result is unacceptable for field quality assurance criteria.
[DOC File]1 - Maine
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Precision is expressed in terms of Relative Percent Difference (RPD) using the following equation: RPD = [(C1-C2) /(C1+C2)/2)] x 100. where: C1 = The larger of the two concentrations. C2 = The smaller of the two concentrations. Laboratory precision will be evaluated using EPA Region I tier evaluation criteria or method specific criteria.
[DOC File]United States Environmental Protection Agency | US EPA
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If both results are 5 x DL, the data will be reported unqualified. Affected Data/ Qualification:_____ _____ Laboratory Duplicates. Criteria/Action Required: The relative percent difference (RPD) between laboratory sample results must be 10% for results >5 x DL.
[DOC File]PRECISION CONTROL CHARTS - Indiana
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Collect 20 data sets as sample + duplicate and calculate the Relative Percent Difference (RPD) for each for the parameter of interest. Calculate the mean. Calculate the standard deviation. Calculate the QC limits for precision using RPD values, The Upper Control Limit …
[DOC File]Homepage - Texas Commission on Environmental Quality - …
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If required by the laboratory’s QAP and/or SOPs, report the %R and relative percent difference (RPD) data for each analyte in the laboratory control sample duplicate (LCSD). (R7) Test Reports or Summary Forms for Matrix Spike/Matrix Spike Duplicate (MS/MSD)
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