AOAC Final Action Methods in 2018

Table 2011.14H. Interlaboratory study results for phosphorus (P)

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

4138.12 3729.50 4341.81

101 100 101 102

84.53 46.37 60.56 98.10 37.86

2.04 1.24 1.39 2.85 1.85

115.22 101.72 111.79 111.97

2.78 2.73 2.57 3.25 3.28 4.62 4.11 6.27 4.17 10.1 7.13 5.7

0.61 0.59 0.57 0.69 0.65 1.01 0.72 1.08 1.42 0.94 1.45 1.73 1.04 1.44 0.42 1.08 0.63 1.11 1.29 1.18 1.13 1.12 1.12 1.08 1.23 1.20 1.18 0.98 0.79 1.03

9 9 9 9 9

NS g

NS NS NS NS

Infant cereal

Peanut butter NIST SRM 2387 Wheat gluten NIST RM 8418

3444.06 (3378) h 2050.02 (2190) h

94

67.15

Matrix extension (2017)

Mean, mg/100 g i

SRM 1849a Whole milk

401 (399)

100 ND j

11.8

2.94 2.98 2.72

18.5 3.89 5.38 20.9 2.56 59.0 2.11 7.40 1.80 5.85 1.68 1.86 3.68 1.88 3.64 3.42 1.98 2.89 2.04 2.61 3.67 1.95 1.39 3.18 56

11 10

0 0 1 2 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

94.6 85.8 991 25.4 827 29.7 89.5 70.8 94.9 41.1 23.8 44.4 22.6 51.8 48.3 25.6 41.3 23.6 32.3 49.6 29.1 25.2 49.1 5.1

2.820

Whole milk powder

ND 2.33 ND 12.9 ND 9.01 ND 0.92 ND 16.5 ND 0.498 ND 3.28 ND 0.74 ND 0.55 ND 1.73 ND 0.69 ND 1.54 ND 0.95 ND 0.31 ND 0.56 ND 0.272 ND 1.18 ND 2.34 ND 0.635 ND 0.37 ND 0.65 ND ND 2.3 1.4

9 8

Whey powder

1.3 1.8

Whey protein concentrate

10

Butter

3.63 1.99 1.68 2.60 2.00 3.46 1.81 2.32 3.89 3.04 2.98 1.96 1.21 1.36 1.16 3.66 4.72 2.18 1.49 1.33

9 9

Cheese

Adult powder, low fat Adult RTF, high fat

7.1 8.3 2.5

11 10 11 11 11 11 11 11 11 11 10 11 11 11 11 11 11 11

Adult RTF, high fat placebo Adult RTF, high protein Adult RTF, high protein placebo Child milk powder placebo

6.17 4.08

7.8 8.3 8.3

Child milk powder

Child elemental powder Infant elemental powder

7

Infant elemental powder placebo

7.08 7.76

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

7

8.7 8.1 7.4

Infant powder milk Infant powder soy

Infant RTF milk

6.69

Infant RTF placebo

5.5 6.5

Toddler powder

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  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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