Data Qualifiers: How Do You Qualify Your Data? Use and Application of Data Qualifiers According to Chapter 62-160, F.A.C. - PowerPoint PPT Presentation

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Data Qualifiers: How Do You Qualify Your Data? Use and Application of Data Qualifiers According to Chapter 62-160, F.A.C.

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The sample and the duplicate values are LOD and LOQ and qualified as LOQ. ... Program Policy and Structure - Appendix A - Glossary (Effective July 1, 2005) ... – PowerPoint PPT presentation

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Title: Data Qualifiers: How Do You Qualify Your Data? Use and Application of Data Qualifiers According to Chapter 62-160, F.A.C.


1
Data Qualifiers How Do You Qualify Your
Data? Use and Application of Data Qualifiers
According to Chapter 62-160, F.A.C.
  • Betsy Kent
  • Reedy Creek Improvement District, Lake Buena
    Vista, Florida

2
Precision
  • The sample and the duplicate values are gt LOD and
    lt LOQ and qualified as lt LOQ.
  • The RPD for these values is gt UCL.
  • Do you qualify the data for precision failure?
  • Do you use the RPD in the statistical calculation
    of limits?

3
Precision
  • The sample value is slightly greater than the LOQ
    and the duplicate value is between the LOD and
    LOQ.
  • The RPD for these values is gt UCL.
  • Do you qualify the data?
  • Do you use the RPD in the statistical calculation
    of limits?

4
Precision
  • The sample value is between the LOD and LOQ and
    qualified as such. The duplicate value is lt LOD
    (ND).
  • Do you calculate a RPD?
  • If yes, what value do you use for the non-detect?
  • Do you qualify the data?
  • If calculated, do you use the RPD in the
    statistical calculation of limits?

5
Precision
  • The LOD is 1.0 ppm.
  • The LOQ is 4.0 ppm.
  • The sample value is 4.0 ppm
  • The duplicate value is 4.9 ppm
  • The RPD UCL is 20.0.
  • The RPD for these values is 20.2.
  • Do you qualify the Data?

6
Precision
  • Does your laboratory have a documented procedure
    to use a factor to determine when to evaluate
    data for precision?
  • Example If concentrations lt 5x LOD then RPD is
    NA.
  • Is this procedure acceptable under the NELAC 2003
    Standard? FDEP 62-160?

7
Precision NELAC 2003 Standard
  • D.1.1.3.2
  • a) Purpose matrix duplicates are defined as
    replicate aliquots of the same sample taken
    through the entire analytical procedure. The
    results from this analysis indicate the precision
    of the results from the specific sample using the
    selected method. The matrix duplicate provides a
    usable measure of precision only when target
    analytes are found in the sample chosen for
    duplication.

8
Precision NELAC 2003 Standard
  • D.1.1.3.2
  • d) Evaluation Criteria and Corrective Action
    The results from matrix duplicates are primarily
    designed to assess the precision of analytical
    results in a given matrix and are expressed as
    relative percent difference (RPD) or other
    statistical treatment (e.g., absolute
    differences). The laboratory shall document the
    calculation for relative percent difference or
    other statistical treatments.

9
Precision NELAC 2003 Standard
  • D.1.1.3.2
  • d cont.) Results are compared to the acceptance
    criteria as published in the mandated test
    method. Where there are no established
    criteria, the laboratory shall determine
    internal criteria and document the method used to
    establish the limits. For matrix duplicate
    results outside established criteria corrective
    actions shall be documented or the data reported
    with appropriate data qualifying codes.

10
Accuracy
  • The MS is within R control limits.
  • The MSD is outside R control limits.
  • The MS/MSD RPD is within RPD control limits.
  • Do you qualify the data for accuracy failure?

11
Accuracy NELAC 2003 Standard
  • Program Policy and Structure - Appendix A -
    Glossary (Effective July 1, 2005)
  • Matrix Spike Duplicate (spiked sample or
    fortified sample duplicate) a second replicate
    matrix spike prepared in the laboratory and
    analyzed to obtain a measure of the precision of
    the recovery of each analyte. (QAMS)

12
Accuracy
  • The MS and MSD are outside R control limits.
  • The LCS and all associated method QC is within
    control limits.
  • Do you qualify the data for accuracy failure
    citing suspect matrix interference? How do you
    determine that matrix interference was the cause?

13
Accuracy
  • The Rs for MS and MSD are lt LCL.
  • The data is qualified for accuracy failure.
  • Do you include information of low bias recovery
    on the data report?
  • The Rs for MS and MSD are gt UCL.
  • The data is qualified for accuracy failure.
  • Do you include information of high bias recovery
    on the data report?

14
Accuracy
  • EPA 8260 Analyze sample with 4 surrogate
    standards
  • 1 out of 4 surrogates is outside R limits.
  • Do you qualify data results?
  • All compounds? Sub-set of compounds?
  • Do you include information on bias on the
    data report?

15
Accuracy
  • EPA 8270 Analyze sample with 3 BN and 3 Acid
    surrogate standards
  • 1 out of 3 BN surrogates is outside R limits.
  • Do you qualify data results?
    All compounds? All BN compounds? Sub-set BN
    compounds?
  • Do you include information on bias on the
    data report?

16
Data Reports Where Do You Place the PA
Qualifiers?
  • On the Data Report with the sample
    value?
  • On the Quality Control Report with the
    RPD and/or R?
  • In the Case Narrative?
  • In Sample Comments?

17
Data Reports Where Do You Place the PA
Qualifiers?
  • How do you address data received from a
    sub-contract laboratory that does not
    include the data qualifier(s) next to the
    sample value?

18
Thank you Betsy Kent RCID Environmental
Services betsy.kent_at_rcid.dst.fl.us
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