program. (Techniques for generating spectra representing the analytes at the concentration
indicated by the analysis — “scaled spectra,” as defined in APPENDIX A — are described in
APPENDIX E. The analyst should generate such spectra and compare them, either visually or
mathematically, to the indicated sample spectra.)
17. Corrective actions: If the results of steps 14, 15, and 16 indicate that the data quality objectives of
the test plan have not been achieved, the analyst may perform one or more of the following actions:
• Averaging of sequential sample spectra to reduce the RSA.
• Inclusion of contaminant reference spectra in the mathematical analysis.
• Development of more accurate analyte or interferant reference spectra.
• Inclusion of reference spectra for additional compounds in the mathematical analysis.
• Exclusion from the mathematical analysis of analyte and/or interferant compounds that are
clearly absent in the samples.
• Deresolution or wavenumber adjustment of the reference spectral library to match that of the
sample spectra (or vice versa).
• Revision of the original data quality objectives (those included in the test plan) to levels
supported by the test data.
NOTE: After performing any such corrective actions, the analyst must repeat steps 13, 14, 15, and 16
and reevaluate the LOD value for each analyte compound.