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AOAC RESEARCH INSTITUTE  Expert Review Panel Chair Report for Fertilizers  Page 3 of 4 

EXPERT REVIEW PANEL, METHOD BACKGROUND, AND CONCLUSIONS 

Criteria for Vetting Methods to be considered: AOAC convened the Official Methods of Analysis SM  (OMA) Expert Review Panel for Fertilizers for Phosphorus and  Potassium that was held on Monday, December 4, 2017 from 10:00am EST to 11:00am EST via GoToMeeting and  audio teleconference.  The purpose of the meeting was to review and evaluate AOAC Official Method 2015.18 Phosphorus and Potassium  in Commercial Inorganic Fertilizers Inductively Coupled Plasma–Optical Emission Spectrometry, First Action 2015  (original study director, James Bartos of the Office of Indiana State Chemist at Purdue University, located at 175  South University Street, West Lafayette, Indiana 47907) for recommendation for AOAC Final Action Official Methods  status.    AOAC Official Method 2015.18 was reviewed and supplemental information was also provided to the reviewers  which included a copy of the OMA method, Article:  Determination of Phosphorus and Potassium in Commercial  Inorganic Fertilizers by Inductively Coupled Plasma–Optical Emission Spectrometry: Single‐Laboratory Validation,  First Action 2015.18, and the AOAC Expert Review Panel Chair Report of September 2015. Criteria for Vetting Experts and Selection Process: The original twenty‐five (25) candidates are being submitted for consideration by the Official Methods Board to  evaluate candidate methods for Fertilizers which include the subject matter areas of Metals, Nitrogen (slow release),  Phosphorus & Potassium, Total Sulfur, and Urea as per the Expert Review Panel (ERP) Policies and Procedures. The  candidates were highly recommended by the Agricultural Materials Community, the Association of American Feed  and Control Officials (AAFCO), the Association of Fertilizer and Phosphate Chemists (AFPC) and other subject matter  experts. Many of the following candidates have participated in various AOAC activities, including but limited to,  Method Centric Committees that were formed under the legacy OMA pathway.  The following members were  present to review methods: William Hall, James Bartos, Elizabeth Guertal, Barbara James, Solomon Kariuki, William  Martin, Ana Rita Nogueira, Salvatore Parisi, Heidi Phillips, Kristopher Shelite, Rechel Tan, and Dion Tsourides.  ERP Orientation: All ERP members have completed the mandatory AOAC Expert Review Panel Orientation Webinar.   Expert Review Panel Meeting Quorum The meeting of the Expert Review Panel was held in person. A quorum is the presence of seven (7) members or 2/3  of the total vetted ERP, whichever is greater. Ten (10) out of the twelve (12) members were present and therefore  met a quorum to conduct the meeting.    Conclusion: The Expert Review Panel recommended a continuance of 2‐years for AOAC Official Method 2015.18.  The decisions  have been captured and reflected in the meeting minutes.   Subsequent ERP Activities: ERP members are required to continue to track the performance of AOAC Official Method 2015.18 for a period of 2  years effective as of December 4, 2017.   Standard Method Performance Requirements (SMPRs):  N/A 

03/12/2018

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