What corrective actions are appropriate for a QC failure in a BOD or COD test?

What corrective actions are appropriate for a QC failure in a BOD or COD test?

• A. Recheck calibration, inspect reagents/seed, re-run QC samples, repeat affected analyses, and document deviations and corrective actions.
• B. Terminate the method for the day.
• C. Replace the instrument and ignore the failure.
• D. Extend the reporting period to avoid reanalysis.

Answer: (A)

When a QC failure occurs, you must take steps to verify and restore measurement validity. Recheck calibration to confirm the instrument’s readings are correct, inspect reagents, standards, and seed (for BOD tests) to ensure they’re fresh and prepared properly, re-run QC samples to confirm the QC criteria are now met, repeat any analyses that were affected by the failure to ensure the data are reliable, and document all deviations and corrective actions for traceability and regulatory compliance. This approach prevents relying on questionable results. Simply terminating the method, replacing the instrument and ignoring the failure, or extending the reporting period to dodge reanalysis would hide the issue and compromise data integrity.

When a QC failure occurs, you must take steps to verify and restore measurement validity. Recheck calibration to confirm the instrument’s readings are correct, inspect reagents, standards, and seed (for BOD tests) to ensure they’re fresh and prepared properly, re-run QC samples to confirm the QC criteria are now met, repeat any analyses that were affected by the failure to ensure the data are reliable, and document all deviations and corrective actions for traceability and regulatory compliance. This approach prevents relying on questionable results. Simply terminating the method, replacing the instrument and ignoring the failure, or extending the reporting period to dodge reanalysis would hide the issue and compromise data integrity.