Field duplicate rpd limits
[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.
[DOC File]FOR INTRA-AGENCY POLICY DELIBERATIONS
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Reporting Limits for Trace Metals by WSC-CAM-III C ... Prepare by digesting and analyzing an additional aliquot of the same field sample used for MS. RPD for each target analyte must be
[DOCX File]1.0 INTRODUCTION - Montana DEQ > Home
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Precision for field QC samples will be assessed by ensuring that relative percent difference (RPD) between duplicates is less than 25%. If the RPD of field duplicates is greater than 25%, all data results from the duplicate pair’s parent sample that are less than 5 times the concentration in the duplicate sample will be flagged with a “J”.
[DOC File]Quality Assurance Project Plan
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Absolute value (Sample 1(S1) – Sample 2(S2)) / ((S1 + S2)/2) * 100 = RPD. A 5% collection of a field duplicate are required for chemical parameters, which is a minimum of 1 duplicate per 20 samples or 1 sample per sampling event if less than 20 samples.
[DOC File]QAPP Template for Lab Fieldwork Projects
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If the relative percent difference (RPD) of field duplicate results in greater than 25% and the absolute difference is greater than the reporting limit (RL), both samples should be reanalyzed. Matrix Spikes and Matrix Spike Duplicates. Matrix spikes and matrix spike duplicates will be analyzed at the rate of one pair per sample batch.
[DOC File]1 - Home | Colorado.gov
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Precision is best expressed in terms of the standard deviation or the relative percent difference (RPD) between field duplicate measurements. From USEPA: RPD = [(x1 – x2) / {(x1 + x2)/2}] x 100 . RPD = relative percent difference (%) x1 and x2 = duplicate measurements of the same parameter. The smaller the RPD, the more precise are the ...
[DOC File]ATTACHMENT G
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Field duplicates measure sampling precision and variability for comparison of project data. Acceptable relative percent difference (RPD) is less than 25 for field duplicate analyses. If field duplicate sample results vary beyond these objectives, the results will be qualified. 4.3 Internal Quality Control (QC)
[DOCX File]Laboratory Data Review Checklist - Alaska DEC
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Precision – All relative percent differences (RPD) reported and less than method or laboratory limits and project specified objectives, if applicable? RPD reported from LCS/LCSD, and or sample/sample duplicate. (AK Petroleum methods 20%; all other analyses see the laboratory QC pages)
[DOC File]Parameter
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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. The field duplicate exceeds the project’s established QAPP acceptance limits.
[DOCX File]1.0 INTRODUCTION
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Field duplicate samples will be collected, handled and stored in the same way as the routine samples for laboratory shipment. Duplicates are used to determine field and laboratory precision. Field duplicates will be used to evaluate data precision by calculating their relative percent difference (RPD):
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