AOAC Final Action Methods in 2018

Table 2011.14F. Interlaboratory study results for manganese (Mn)

Original validation (2011)

Matrix

Mean, mg/kg Rec., % s r a

RSD r

b , % s

R c , mg/kg RSD R

d , % HorRat

No. of labs e Outlier labs f

Chocolate milk powder Dietetic milk powder 2

7.54 0.40

NA h

0.14 0.01 1.14 0.45 0.23

1.88 2.56 6.79 2.86 1.75

0.67

8.82 4.89 8.61 8.31 8.75

0.75 0.27 0.82 0.79 0.80

9 8 9 9 9

NS g

99

0.0197

2C NS NS NS

Infant cereal

16.74

NA

1.44 1.32 1.13

Peanut butter NIST SRM 2387 Wheat gluten NIST RM 8418

15.85 (16.0) i 12.87 (14.3) 1

99 90

Matrix extension (2017)

Mean, mg/100 g i

SRM 1849a Whole milk

4.89 (4.96)

99

0.088

1.81

0.221

4.51

0.51

12

0 3 2 1 2 2 1 2 1 1 0 3 3 1 2 1 2 2 2 2 1 3 4 3 0

0.002 0.002 0.009 0.009 0.001 0.013 0.156 0.357 0.008 0.420 0.006 0.004 0.165 0.009 0.052 0.004 0.012 0.025 0.012 0.006 0.034 0.012 0.001 0.088

ND j

ND

ND 3.3

ND

ND

ND

6 7 7 6 3 7

Whole milk powder

ND 0.000 ND 0.004

0.001 0.005

42.6

1.49

Whey powder

38

50

2.2 ND ND

Whey protein concentrate

ND ND

ND ND

ND ND

ND ND

ND ND

Butter

Cheese

ND 0.002 ND 0.001 ND 0.023 ND 0.001 ND 0.023 ND 0.000 ND 0.000 ND 0.006 ND 0.000 ND 0.001 ND 0.000 ND 0.000 ND 0.001 ND 0.000 ND 0.000 ND 0.001 ND 0.000 ND 0.000 ND 0.002

11.5

0.005 0.011 0.062 0.002 0.039 0.000 0.014 0.001 0.005 0.001 0.002 0.002 0.002 0.001 0.002 0.002 0.001 0

39.4

1.82 0.46 1.32

Adult powder, low fat

0.9 6.5

6.9

10 11 11 12

Adult RTF, high fat

17.5

Adult RTF, high fat placebo

7.9

19.1

0.8

Adult RTF, high protein

5.36

9.2 7.3

0.72 0.30 0.43 0.58 0.37 0.58 0.82 0.94 0.46 0.59 0.97 0.33 0.59 1.95 0.70

Adult RTF, high protein placebo

2.8 4.9

7 9

Child milk powder placebo

11.5

Child milk powder

3.65 2.34

8.7 8.4

11 10 11

Child elemental powder Infant elemental powder

1.6

10.3 21.6 20.7

Infant elemental powder placebo

4.63

8 9

Infant PH powder milk Infant PH powder soy Infant powder FOS-GOS

3.2 2.1 1.5 6.3 2.9

9.1

10 10 10

13

Infant powder milk Infant powder soy

23.7

6.3

9 8 8

Infant RTF milk

3.45

13 65

Infant RTF placebo

18

Toddler powder

2.48

0.01

11.44

12

a  s r = Standard deviation for repeatability (within laboratory). b  RSD r = Relative standard deviation for repeatability. c  s R = Standard deviation for reproducibility (among laboratories). d  RSD R = Relative standard deviation for reproducibility. e  Reporting laboratories minus outliers. f  C = Cochran outlier; SG = Single Grubbs outlier; DG = Double Grubbs outlier.

g  NS = Not significant. h  NA = Not available. i  Value in parentheses = Certified or reference values. i  Results expressed as mg/100 g for ready-to-feed liquids as-is or reconstituted powders (25 g in 200 g water) or liquid concentrates (1:1 dilution by weight). j  ND = Not determined.

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