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[DOC File]QAPP Template for Lab Fieldwork Projects
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RPD is the absolute difference between two results expressed as a percentage of the average result. It is calculated according to the following formula: RPD = S – D X 100 (S + D) / 2. Where: S = Original sample value; D = Duplicate sample value. The acceptance criteria for RPD will be less than or equal to 20%.
rpd calculation formula

[DOC File]Homepage - Texas Commission on Environmental Quality - …
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If a project sample was analyzed as a laboratory duplicate was analyzed, the data package must include the duplicate sample test report summary form. Include in the duplicate sample test report the calculated RPD between the sample and the sample duplicate results and the QC limits for the RPD.
rpd calc

[DOC File]ISSUED REPORT
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7. Sample 0227-118-2 Lab Duplicate has incorrect concentration (0.064 recorded but result is really 0.636). Thus, RPD for sample 0227-118-2 (0.479) and its Lab Duplicate (0.636) is 28.2% (outside acceptance limit of 20% per SOP QC requirement). 8. Sample 0301-007-3 EFF #1 Reported result (0.9) > highest ICAL standard (0.8). Sample was NOT ...
rpd calculation excel

[DOC File]FOR INTRA-AGENCY POLICY DELIBERATIONS
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(2) If RPD still outside of criteria, dilute sample and re-analyze diluted sample with duplicate injections. (3) If RPD still outside of criteria on dilution, narrate. Report Duplicate Injection RPD exceedances in laboratory narrative – potential sample matrix interference.
rpd calculation formula

[DOC File]QUALITY ASSURANCE MANUAL
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A Sample LOD calculation for Ammonia-nitrogen. ... The calculated precision value (RPD) must meet the control limit guidelines outlined earlier in the Quality Assurance Manual. If the duplicates exceed the acceptable control limit, they must be rerun until an acceptable RPD is achieved. ... A duplicate sample is analyzed with each analytical ...
rpd calc

[DOC File]Ohio EPA Home
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Relative Percent Difference (RPD): Relative percent difference is used for organics and inorganics when comparing the duplicate sample results to the original sample results. Analytical results within 20% of each other indicate that the laboratory followed their Quality Assurance Program Plan (QAPP). See formula in Equation 7.2 below.
rpd calculation excel

[DOC File]NC DENR/DWQ LABORATORY CERTIFICATION
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Jan 30, 2020 · ANSWER: Will have two % recovery calculations for accuracy from spike recoveries and one RPD calculation for precision from duplicate calculation . SM states: Calculate recovery limits and RPD, and plot control charts to determine acceptance criteria. (see question 41 Bottom Line). 42
rpd calculation formula

[DOC File]National Analytical Management Program
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When the MARLAP, DER or the RPD criteria pass, then the duplicate is acceptable. MARLAP, Chapter 18, Section 4.1 QSM Rev. 5.0, Module 6, Section 1.7.2.3 b)xi) 8.10.5 Are duplicates that do not meet the above requirements due to difficulty in subsampling, described in the case narrative?
rpd calc

[DOC File]LITERATURE CITED
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4) Duplicate Sample – Measures the precision (as Relative Percent Difference or RPD) of the analytical process. The acceptable laboratory %RPD range is typically ( 25%. 5) Spike Sample (Laboratory Fortified Blank - LFB, Laboratory Fortified Matrix - LFM)– Measures the accuracy (% Recovery) of an analytical method.
rpd calculation excel

[DOC File]North Carolina Division of Water Quality
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The relative percent difference (RPD) calculated for each set of duplicate samples and overall means RPD by parameter are shown in Table 2. There were a large percentage of duplicate samples where both results were reported as less than the reporting limit (ND).
rpd calculation formula

Sample duplicate rpd calculation