AOAC Final Action Methods in 2017
P ACQUETTE & T HOMPSON : J OURNAL OF AOAC I NTERNATIONAL V OL . 101, N O . 2, 2018 549
Table 4. MLT statistics for the 12 elements in the ISO/IDF matrixes
Sample
1 a
2 b
3 c
4 d
5 e
6 f
Parameter
Calcium
Year of interlab test
2016
2016
2016
2016
2016
2016
No. of labs submitting results
10
10
10
10
10
10
No. of outliers (individual replicates)
0
0
0
0
0
0
No. of accepted results
20
20
20
20
20
20
Overall mean of all data (grand mean) g
19.1 0.80 1.41 4.16 7.38 2.23 3.96 1.02
498
670
115
106
689
S r
7.07
10.25 119.9
1.63 4.77 1.42 4.15 4.57
1.62 4.33 1.53 4.10 4.53
10.20 40.17
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S R
26.00
RSD r RSD R
1.42 5.22
1.53
1.48 5.83
h
17.90
Repeatability limit r (r = 2.8 × s r ) Reproducibility limit R (R = 2.8 × s R )
19.80 72.79
28.70 335.8
28.55 112.5
13.36
12.13
HorRat value
1.18
4.20
0.75
0.73
1.38
Repeatability limit SMPR for products Reproducibility limit SMPR for products
5
5
5
5
5
5
10
10
10
10
10
10
Potassium
Year of interlab test
2016
2016
2016
2016
2016
2016
No. of labs submitting results
10
10
10
10
10
10
No. of outliers (individual replicates)
0
0
0
0
0
0
No. of accepted results
20
20
20
20
20
20
Overall mean of all data (grand mean) g
35.7 2.06 2.82 7.90 5.76 7.90 1.20
97.7 2.49 3.80 2.55 3.89 6.98
2004
163
135
831
S r
60.12 280.6
3.97 8.52 2.44 5.24
3.60 9.13 2.67 6.76
19.53 58.83
S R
h
RSD r RSD R
5.76
3.00
2.35 7.08
h
14.0
Repeatability limit r (r = 2.8 × s r ) Reproducibility limit R (R = 2.8 × s R )
168.3 785.6
11.10 23.84
10.09 25.55
54.68 164.7
10.64
HorRat value
0.68
3.89
1.00
1.25
1.72
Repeatability limit SMPR for products Reproducibility limit SMPR for products
5
5
5
5
5
5
10
10
10
10
10
10
Magnesium
Year of interlab test
2016
2016
2016
2016
2016
2016
No. of labs submitting results
10
9 2
8 0
10
9 2
10
No. of outliers (individual replicates)
1
0
0
No. of accepted results
19
16
16
20
16
20
Overall mean of all data (grand mean) g
2.24 0.08 0.14 3.36 6.21 0.21 0.39 0.62
20.4 0.37 0.74 1.83 3.64 1.05 2.08 0.51
203
10.7 0.11 0.54 1.00 5.02 0.30 1.50 0.63
9.44 0.12 0.26 1.28 2.75 0.34 0.73 0.34
75.3 0.86 4.44 1.14 5.90 2.40
S r
3.02
S R
13.17
RSD r RSD R
1.49 6.49 8.47
Repeatability limit r (r = 2.8 × s r ) Reproducibility limit R (R = 2.8 × s R )
36.89
12.44
HorRat value
1.28
1.00
Repeatability limit SMPR for products Reproducibility limit SMPR for products
5
5
5
5
5
5
10
10
10
10
10
10
Manganese
Year of interlab test
2016
2016
2016
2016
2016
2016
No. of labs submitting results
9 2
10
8 4
10
10
9 2
No. of outliers (individual replicates)
0
1
1
No. of accepted results
16
20
12
19
19
16
Overall mean of all data (grand mean) g
0.000828
0.0143
0.00664
0.00228
0.00218
0.00803
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