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AOAC RESEARCH INSTITUTE
AOAC
OFFICIAL METHODS OF ANALYSIS
(OMA)
«Project_Number»: «Company_Name»«Method_Name»
Page
2
of
8
ER 4
Yes
ER 5
Yes
ER 6
Yes
ER 7
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 1
Basic Methodology
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.