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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