AOAC Final Action Methods in 2018

Table 2011.14G. Interlaboratory study results for sodium (Na)

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

1927.84 1769.19 992.41

97 96 95

43.30 18.64 37.67

2.25 1.05 3.80 3.22 1.45 1.78 2.54 1.72 4.54 2.11 1.46 1.84 2.21 3.2

51.07 33.39 39.72

2.65 1.89 4.00 3.22 1.99

0.52 0.36 0.71 0.72 0.37 0.56 0.83 1.09 1.42 1.03 1.17 2.14 1.16

9 9 8 9 8

NS g

NS

Infant cereal

6SG

Peanut butter NIST SRM 2387 Wheat gluten NIST RM 8418

4924.12 (4890) h 1346.82 (1420) h

101

158.61

158.61

NS

95

19.56

26.85

6SG

Matrix extension (2017)

Mean, mg/100 g i

SRM 1849a Whole milk

427 (427)

100 ND j

7.6

10.9 1.99 2.42 13.2 14.1 83.4 1.99 6.75 1.26 1.76 2.21 2.15 1.39 1.99 1.24 1.42 2.04 1.71 54 8 6.22 5.6

2.54 5.43 7.24

11 11 11 11 10 10 12 12 12 12 12 12 11 12 11 12 10 12 12 11 12 12 11 12 9

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

36.7 33.5 933 261 243 972 24.5 140 138 102 102 4.96 18.5 20.3 26.9 26.9 17.5 26.6 15.9 15.5 25.2 18.4 12.2 29.3

0.930

Whole milk powder

ND 0.575 ND 42.3

Whey powder

5.7

Whey protein concentrate

ND ND

5.5 7.7

5.04

Butter

5.8

Cheese

ND 14.1 ND 0.452 ND 3.09 ND 1.77 ND 0.93 ND 0.238 ND 0.64 ND 0.729 ND 0.495 ND 0.27 ND 0.82 ND 0.384 ND 0.407 ND 1.05 ND 0.664 ND 0.358 ND 0.408 ND 4 ND 1.2

8.59 8.12 4.84 6.08 5.48 13.4 5.9

Adult powder, low fat Adult RTF, high fat

0.9 1.1

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

3.1

1.73

1.08 0.97

0.9 4.8

0.662

1.5

Child milk powder

3.45 3.59

6.8

0.93

Child elemental powder Infant elemental powder

8.66

1.2

4.5

8.2

1.19 1.16 1.08 1.08 1.04 1.22 1.16 1.28 0.85 1.13

Infant elemental powder placebo

1.84

7.98

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

1.5 3.1

8

7.48 7.77 9.13

2.42 2.62 4.18 3.61 2.95

Infant powder milk Infant powder soy

8.1

Infant RTF milk

9.32

Infant RTF placebo

0.8

6.6

Toddler powder

1.4

2.25

7.68

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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