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• Point out the possible need for increased maintenance when employing the method. Include 1
precautions about the lens and/or lens stack possibly requiring additional maintenance and that 2
analysis would benefit from thoroughly conditioning the instrument. 3
• Clarify the use and/or preparation of second source standards for continuing calibration 4
verification standard solutions. 5
• If acidic sample matrices are typically analyzed on the ICP-MS instrument, perform a thorough 6
cleaning of the entire sample introduction system and appropriate conditioning prior to 7
analyzing basic matrices. 8
• Clarify the importance of adhering to the peristaltic pump tubing sizes recommended for 9
introducing internal standard and carrier solutions. 10
• If possible, maintain a dedicated set of cones and/or lens. 11
The method author provided clarification to address the points discussed during the ERP meeting in 12
March 2015 in a revised manuscript since the March meeting. No other concerns were raised. ERP 13
members reviewed the manuscript in preparation for publications and the manuscript is under 14
consideration for publication in the Journal. 15
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ATTACHMENTS AND REFERENCES: 18
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1. Boyd, Delia, Meeting Proceedings of the AOAC Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN)
Stakeholder Meeting, September 29, 2012.
2. Method Evaluation Form for AOAC 2012.15, Total Iodine in Infant Formula and Adult/Pediatric Nutritional Formula Using
ICP-MS.
3. AOAC Committee on Safety and McKenzie, Deborah, AOAC Method Safety and Risk Assessment, AOAC Official Methods
Program.
4. Boyd, Delia, Meeting Proceedings of the AOAC Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN)
Meeting Minutes from AOAC SPIFAN meeting held on April 5, 2011 (Day 1 of AOAC SPIFAN meeting).
5. Schmitz, Dan, AOAC SPIFAN Working Group on SPIFAN Materials, SPIFAN Single Laboratory Validation Kit – Common infant
formula reference materials, (2011).
6. Appendix F: Guidelines for Standard Method Performance Requirements Official Methods of Analysis of AOAC
INTERNATIONAL e-OMA a
7. Sullivan, Darryl and Zywicki, Richard, Determination of Total Iodine in Food and Dietary Supplements Using Inductively
Coupled Plasma-Mass Spectrometry Journal of AOAC INTERNATIONAL 2012, volume 95
8. Covance Laboratories Inc. Nutritional Chemistry and Food Safety, AOAC SPIFAN Supplemental Data to IOD-2 from Iodine
Analysis in Infant Formula and Adult Nutritionals Using a Covance Developed Method: “Determination of Total Iodine in
Foods and Dietary Supplements using Inductively Coupled Plasma-Mass Spectrometry. Issue Date: 10 August 2012.
9. Covance Laboratories Inc. Nutritional Chemistry and Food Safety, AOAC SPIFAN Single Laboratory Validation for Iodine
Analysis in Infant Formula and Adult Nutritionals, First Action 2012.15, Report Issue Date: 25 July 2013
10. Appendix L: AOAC Recommended Guidelines for Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN)
Single-Laboratory Validation, Official Methods of Analysis of AOAC INTERNATIONAL e-OMA a or print
OMA 19th edition (2012).
11. Boyd, Delia, AOAC SPIFAN Study Directors Education Session Meeting Minutes, April 4, 2011.