AOAC OMA# 2011.14 (Final Action Review)-OMB

8 Maximum Time-to-Result No maximum time. Approved by AOAC Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN). Final Version Date: March 18, 2014. Revised: May 26, 2016 to correct unit in Table 1 footnote b.

Table 2. Certified mass fraction values for selected elements in SRM 1849a a Element

Mass fraction, mg/kg Coverage factor ( k )

Calcium b–d Copper b–d

5253 ± 51

2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00

19.78 ± 0.26 1.072 ± 0.032 1.29 ± 0.11 175.6 ± 2.9 1648 ± 36 49.59 ± 0.97 1.707 ± 0.040

Chromium b–e

Iodine c,e,f

Iron b–d

Magnesium b–d Manganese b–d Molybdenum b–e Phosphorus b–d Potassium b–d

3990 ± 140 9220 ± 110

Selenium c–e Sodium b–d

0.812 ± 0.029

4265 ± 83 151.0 ± 5.6

Zinc b–d 2.00 a  Each certified mass fraction value is the mean from the combination of the mean of results from analyses by NIST, the median of the results provided by collaborating laboratories, and the mean result provided by the material manufacturer, where available. The uncertainty provided with each value is an expanded uncertainty about the mean to cover the measurand with approximately 95% confidence. The expanded uncertainty is calculated as U = ku c , where u c incorporates the observed difference between the results from the methods and their respective uncertainties, consistent with the ISO Guide and with its Supplement 1, and k is a coverage factor corresponding to approximately 95% confidence. b  NIST ICP-OES. c  Collaborating laboratories.

d  Manufacturer. e  NIST ICP-MS. f  NIST INAA.

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