AOAC RI ERP EBOOK FOR FERTILIZERS

AOAC RESEARCH INSTITUTE AOAC OFFICIAL METHODS OF ANALYSIS (OMA)

OMAMAN-28/AOAC 2006.03 Study Director: Sharon Webb, University of Kentucky, Division of Regulatory Services, 103 Regulatory Services Bldg, Lexington , Kentucky 40546-0275

used and de-convolution techniques. Additional work needs to be done here to better guide future users. ER 10 Little discussion of what materials may not be suitable for analysis by this method. Supporting Data and Information: Does data from collaborative study support the method as written? ER 1 Partially, again without knowing the ICP plasma configuration used by each participating lab, there maybe biases in the results based on the plasma orientation used with regards to the recommended methodology (ie. Internal Standards recommended).

ER 2 ER 3 ER 4 ER 5 ER 6 ER 7 ER 8

Yes, for a modification an extension of AOAC 2006.03.

YES Yes

This was a single laboratory study.

n/a yes

The current manuscript is a single-laboratory validation study. The available data support the method as written. Yes, however data on a few more materials may be needed to support the full scope of "fertilizers". ICP variables may need to be researched (ruggedness) to determine where variation can be tolerated based on instrument differences.

ER 9

ER 10 Yes, appears to. Supporting Data and information: Does data collected support the criteria given in the collaborative study protocol? ER 1 Yes ER 2 Yes, dramatic improvement in RSD% are evident. ER 3 YES ER 4 Yes ER 5 Se values in the sample are at or below the method LOQ (Pg 109) ER 6 n/a ER 7 yes ER 8 The current manuscript is a single-laboratory validation study. ER 9 I did not see a collaborative study protocol beyond the information provided in the JAOAC article. If there is a protocol available please provide a link to it or the file itself. ER 10 Yes, appears to. Are there any concerns regarding the safety of the method? ER 1 No concerns ER 2 No ER 3 Yes, what about Na and NO3 potential reactions with other constituents? ER 4 No ER 5 Yes, Safety Advisor has addressed. ER 6 no ER 7 No Page 9 of 14