AOAC OMA# 2011.14 (Final Action Review)-OMB

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

10 000 mg/kg, 5 mL copper 1000 mg/kg, 25 mL iron 1000 mg/kg, 100 mL potassium, 25 mL magnesium 10 000 mg/kg, 0.125 mL manganese 1000 mg/kg, 50 mL sodium 10 000 mg/kg, 50 mL phosphorus 10 000 mg/kg, and 10 mL zinc 1000 mg/kg. Add 10 mL HNO 3 and dilute to volume with H 2 O. Store in a high-density polyethylene bottle. ( h ) Working standard solutions .—Standards prepared from intermediate stock standard solution are designed to have the same acid concentration as digested test solutions (i.e., 10%, v/v, HNO 3 ) for MDC or 15% (v/v) for MDO using combined acids (HNO 3 , H 2 O 2 , and HCl). See Table 2011.14J for suggested concentrations of the 6 working standards. ( 1 ) Std6 .—Pipet 15.0 mL intermediate stock standard solution into a 100 mL acid- washed volumetric flask. Add 10 mL HNO 3 (MDC) or 15 mL combined acids (MDO), dilute to volume with H 2 O, mix, and transfer to acid-washed polyethylene bottle. ( 2 ) Std5 .—Pipet 10 mL intermediate stock standard solution into a 100 mL acid- washed volumetric flask. Add 10 mL HNO 3 (MDC) or 15 mL combined acids (MDO), dilute to volume with H 2 O, mix, and transfer to acid-washed polyethylene bottle. ( 3 ) Std4 .—Pipet 5.0 mL intermediate stock standard solution into a 100 mL acid- washed volumetric flask. Add 10 mL HNO 3 (MDC) or 15 mL combined acids (MDO), dilute to volume with H 2 O, mix, and transfer to acid-washed polyethylene bottle. ( 4 ) Std3 .—Pipet 2.0 mL intermediate stock standard solution into a 100 mL acid- washed volumetric flask. Add 10 mL HNO 3 (MDC) or 15 mL combined acids (MDO), dilute to volume with H 2 O, mix, and transfer to acid-washed polyethylene bottle. ( 5 ) Std2 .—Pipet 1.0 mL intermediate stock standard solution into a 100 mL acid- washed volumetric flask. Add 10 mL HNO 3 (MDC) or 15 mL combined acids (MDO),