AOAC SPIFAN Nutrients ERP Method Reviews (September 7, 2019)

Reviewer 2_Fluor-04 AOAC Expert Review Panel: First Action Method Review Reviewer Information Required to validate your review.

Remember, the main purpose of your review is to ensure the method conforms to the applicable SMPR. View and download most SMPRs here:

SPDS SMPRs SPSFAM SMPRs

Method Review Title of Method * Fluoride Determination in Milk, Soy, and Water‐based Products Using Ion Selective Electrode and Direct Measurement Technique

AOAC Candidate Method Number (e.g. ALN-01) * Fluor-04 Applicable SMPR *: SMPR 2014.016

I. Summary of the Method I. Summary of the Method *

Fluoride is determined quantitatively using ion selective electrodes. Samples and standards are treated with concentrated hydrochloric acid to help solubilize suspended inorganic material, and sodium citrate buffer is added to adjust the pH and the ionic strength. The fluoride concentration is determined using an external calibration technique II. Review of the Method Only 1. Does the applicability of the method support the applicability of the SMPR? If not, please explain what is missing. * 13 SPIFAN samples and one SRM were measured. Its applicability meets the SMPR requirement. 2. Does the analytical technique(s) used in the method meet the SMPR? If not, please specify how it differs from what is stated in the SMPR. *