AOAC OMA# 2011.14 (Final Action Review)-OMB

2011.14 (Oct. 2018) – MTE-03 Final Action Review FOR ERP USE ONLY DO NOT DISTRIBUTE

milk powder, infant formula powders, and adult nutritional powders (25 g into 200 g of water), using a typical sample size of mass of the reconstituted slurry per final analytical solution volume of 25 mL : Ca (1280); Cu (1.2); Fe (20); K (2000); Mg (110); Mn (1.0); Na (850); P (800); Zn (18). Limits of quantitation (LOQ; mg/100 g) for (i) milk and "ready to feed" liquids as-is using a typical sample size of 4 g per final analytical solution volume of 25 mL and (ii) reconstituted milk powder, infant formula powders, and adult nutritional powders (25 g into 200 g of water), using a typical sample size of mass of the reconstituted slurry per final analytical solution volume of 25 mL : Ca (20); Cu (0.03); Fe (0.5); K (10); Mg (3); Mn (0.01); Na (10); P (15); Zn (0.2). Limits for non- reconstituted dairy ingredients (butter, cheese, whey powders, whey protein concentrates) shall be adjusted proportionally upward from these values based upon the sample size used for the ingredient. For example, if 0.6 g cheese is digested, the limits will be 4 g/0.6 g = 6.7-fold higher. See Tables 2011.14A – I for the results of the interlaboratory studies supporting acceptance of the method. [ Note : Results shown in Tables 2011.14A – I are slightly different from those shown in J. AOAC Int . 92 , 1484(2009) due to classical statistics applied instead of robust statistics applied in the tables included in J. AOAC Int . 95 , 177(2012).]

A. Principle

Test portion is heated at 200°C either with nitric acid in a closed-vessel microwave digestion system (MDC) or with a combination of hydrogen peroxide, nitric acid, and