AOAC ERP Fertilizers - December 2017

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

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 on Monday, September 28, 2015 during the AOAC Annual Meeting and Exposition held at the Westin Bonaventure Hotel, 404 South Figueroa Street, Los Angeles, California 90071. The purpose of the meeting was to review and evaluate OMAMAN-22: Determination of Nitrogen, Phosphorus, Potassium and other nutrients release in Slow- and Controlled-Release Fertilizers, OMAMAN-23: Single Laboratory Validation of a Method for the Determination of Phosphorus and Potassium in Commercial Inorganic Fertilizers by ICP-OES, OMAMAN-24: Determination of Total Sulfur in Fertilizers by High Temperature Combustion, and OMAMAN-28: Simultaneous Determination of Arsenic, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Magnesium, Manganeses, Molybdenum, Nickel, Selenium, and Zinc in Fertilizers by Microwave Acid Digestion and Inductively Coupled Plasma-Optical Emission Spectrometry Detection: Single Laboratory Validation. The study director for OMAMAN-22 was William Hall for Mosaic, located at 13830 Circa Crossing Drive, Lithia, Florida 33547. The candidate method (OMAMAN-22) was reviewed and supplemental information was also provided to the reviewers which included the Evaluation Of A Soil Incubation Method To Characterize Nitrogen Release Patterns of Slow- And Controlled-Release Fertilizers, Optimization And Validation Of An Accelerated Laboratory Extraction Method To Estimate Nitrogen Release Patterns Of Slow- And Controlled-Release Fertilizers, Statistical Correlation Of The Soil Incubation And The Accelerated Laboratory Extraction Methods To Estimate Nitrogen Release Rates Of Slow- And Controlled-Release Fertilizers, and the Method Safety Checklist. This method was reviewed as a single laboratory validation. The study director for OMAMAN-23 was James Bartos of the Office of Indiana State Chemist, Purdue University, located at 175 South University Street, West Lafayette, Indiana 47907. The candidate method (OMAMAN-23) was reviewed and supplemental information was also provided to the reviewers which included the Determination of Phosphorus and Potassium in Commercial Inorganic Fertilizers by Inductively Coupled Plasma-Optical Emission Spectrometry: Single-Laboratory Validation. This method was reviewed as a single laboratory validation. The study director for OMAMAN-24 was Calum McCusker of Elementar Americas, located at 520 Fellowship Road, Suite D-408, Mt. Laurel, New Jersey 08054. The candidate method (OMAMAN-24) was reviewed and supplemental information was also provided to the reviewers which included the Determination of Total Sulfur in Fertilizers by High Temperature Combustion: Single-Laboratory Validation, Material Safety Data Sheet for SICAPENT with Indicator, Method Safety Checklist, and the AOAC Official Method 980.02 Sulfur in Fertilizers- Final Action 1985. This method was reviewed as a single laboratory validation. The study directors for OMAMAN-28 was Sharon Webb of the University of Kentucky, Division of Regulatory Services, located at 103 Regulatory Services Bldg, Lexington , Kentucky 40546-0275. The candidate method (OMAMAN-28) was reviewed and supplemental information was provided to the reviewers which included the Simultaneous Determination of Arsenic, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Magnesium, Manganeses, Molybdenum, Nickel, Selenium, and Zinc in Fertilizers by Microwave Acid Digestion and Inductively Coupled Plasma-Optical Emission Spectrometry Detection: Single Laboratory Validation modification and extension of AOAC 2006.03, Single Laboratory Information, Method Safety Checklist, and AOAC OMA 2006.03. This method was reviewed as a new method.

William Hall, Calum McCusker, and James Bartos were present during the Expert Review Panel session.