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CCV's may or may not be applicable dependent on the mode of calibration e.g., using I.S. further "and/or at end of run" is imprecise wording. Further do not understand use of "recovery" in context of checking instrument calibration with, presumably, pure standards. In 6.2.4 "claims" should be qualified as quantitative to differentiate from e.g. health claims.

Good Afternoon Mr. Windust, Thank you for your comments on the Joint Committee ballot of Standard 173 (173i29) regarding the quality assurance for quantitative test methods. Attached are your comments on this issue and the response of the issue proponent, Kerri LeVanseler of NSF International. I hope the above addresses your concerns. Thank you for your comments. If you have additional comments, or wish to discuss these points further, please contact Ms. LeVanseler.