AOAC ERP Fertilizers - December 2017

AOAC RESEARCH INSTITUTE Expert Review Panel Chair Report for Fertilizers Page 6 of 6 MOTION:

Motion by Phillips; Second by Wegner, to edit the method prior to First Action publication to accommodate sample preparation, instrument conditions, safety, and to allow for other instrument manufacturers. Consensus demonstrated by: (Unanimous) in favor, 0 opposed, and 0 abstentions. Motion Passed. All ERP members presented a review and discussed the proposed collaborative study manuscript for OMAMAN-23: Single Laboratory Validation of a Method for the Determination of Phosphorus and Potassium in Commercial Inorganic Fertilizers by ICP-OES. The method author, James Bartos of the Office of Indiana State Chemist, Purdue University was present and able to address questions and concerns of the ERP members. A summary of comments were provided to the ERP members and the method author. 3 By consensus, the ERP presented the following motions for OMAMAN-23. MOTION: Motion by James; Second by Tsourides , to move OMAMAN-23 to First Action Official Methods status with editorial changes. Consensus demonstrated by: (Unanimous) in favor, 0 opposed, and 0 abstentions. Motion Passed. MOTION: Motion by Tsourides; Second by Shelite, to move OMAMAN-23 to First Action Official Methods status with editorial changes as follows prior to first action publication: 1) To consider empirical calibration and that the system optimization be based the instrument manufacturer’s recommendation for an organic matrix (carbon). Consensus demonstrated by: (Unanimous) in favor, 0 opposed, and 0 abstentions. Motion Passed. MOTION: Motion by Shelite; Second by James, for OMAMAN-23 to be considered for AOAC Final Action, the following is recommended: 1) for the method to be collaboratively studied, and 2) based on collaborative results, the ERP will determine whether the method is for screening or confirmatory. Consensus demonstrated by: (Unanimous) in favor, 0 opposed, and 0 abstentions. Motion Passed. All ERP members presented a review and discussed the proposed collaborative study manuscript for OMAMAN-22: Determination of Nitrogen, Phosphorus, Potassium and other nutrients release in Slow- and Controlled-Release Fertilizers. The method author, William Hall of Mosaic, was present and able to address questions and concerns of the ERP members. A summary of comments were provided to the ERP members and the method author. 4 By consensus, the ERP presented the following motions for OMAMAN-22. MOTION: Motion by Bartos; Second by Hartshorn, to move OMAMAN-22 to First Action Official Methods status. Consensus demonstrated by: 5 in favor, 1 opposed, and 1 abstention. Motion Did Not Pass.* *Method must be adopted by unanimous decision of ERP on first ballot, if not unanimous, negative votes must delineate scientific reasons. Negative vote(s) can be overridden by 2/3 of voting ERP members after due consideration.

MOTION: Motion by Bartos; Second by Hartshorn,

to move OMAMAN-22 to First Action Official Methods

status. Consensus demonstrated by: 5 in favor, 1 opposed, and 1 abstention. Motion Passed. Negative votes were overridden by 2/3 of voting ERP members.

3 Attachment 3: Summary of Expert Reviewer Comments for OMAMAN-23 4 Attachment 4: Summary of Expert Reviewer Comments for OMAMAN-22