AOAC RI ERP EBOOK FOR FERTILIZERS

AOAC RESEARCH INSTITUTE AOAC OFFICIAL METHODS OF ANALYSIS (OMA)

«Project_Number»: «Company_Name»«Method_Name»

ER 4 ER 5 ER 6 ER 7

Yes Yes Yes

Yes Are there sufficient data points per product evaluated in accordance with AOAC requirements? ER 1 Yes ER 2 Yes ER 3 Yes ER 4 Yes ER 5 Yes ER 6 Yes ER 7 Yes General Comments about the Method Scope/Applicability: ER 1 Follows good Inorganic protocols. Similar to both EPA and ASTM methodology. ER 2 Excellent work! This method will enable state fertilizer regulatory laboratories to simultaneously analyze nutrient guarantees and evaluate fertilizer metal levels in support of AAPFCO SUIP #25 requirements. The ability to obtain these results with a single sample preparation and analysis for a broad scope of commercial fertilizer product samples is invaluable. Our laboratory intends to adopt this methodology for the analysis of official fertilizer samples in support of Chapter 576, F.S. ER 3 A multitude of elements (both hazardous and nutritive) are analyzed in a single digestate of fertilizer materials. Wonder if it would be possible to include S in the scope of the method for interlaboratory evaluation. ER 4 Very good method verification. Draws attention to watchouts such as wavelength interferences. ER 5 The addition of Group B metals is a reasonable modification to AOAC 2006.03. This method is needed to replace AOAC 965.09. ER 6 Scope and applicability for this method appears suitable for mentioned metals. ER 7 The method is applicable to a broad range of fertilizers. ER 2 The high level of detail provided in the digestion and detection sections is extremely helpful and will assist laboratories in performing the method properly. Method QC is very strong. Tables 6 and 7 and the Experimental Validation (method ruggedness tests) section are excellent. Finally, the results provided for the Magruder 2009-06 and NIST SRM695 demonstrate the effectiveness of this methodology. ER 3 1. A multitude of elements (both hazardous and nutritive) analyzed in a single digestate greatly improves laboratory efficiencty. 2. Good details and creating calibration standards and results of calibration curves. ER 4 Run sequence defined well to maintain calibration integrity. ER 5 The manuscript is well written. The conclusions are supported by data within the manuscript. ER 6 The manuscript explains well the scope of the method, the procedure and analytical results. ER 1 Basic Methodology

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