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Table 4. Demonstration of reproducibility for several analysts on 9 different days using one ICP-OES
NIST SRM 1849a; Infant/Adult Nutritional Formula mg/kg
ᵃ
Analyte
Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8 Day 9 Average RSD, %
Ca
5190 5124 5185 5118 5207 5198 5063 5053 5198
5148
1,2
Cu
19,53 19,83 19,30 19,31 19,63 20,08 20,05 20,14 19,39
19,69
1,7
Fe
167,8 166,1 166,1 167,6 167,9 169,7 166,3 164,5 167,4
167,0
0,9
K
9438 9506 9388 9414 9457 9513 9822 9545 9441
9502
1,4
Mg
1570 1552 1585 1574 1585 1573 1553 1529 1577
1566
1,2
Mn
48,13 47,96 48,02 49,61 48,38 49,41 49,07 48,43 49,63
48,74
1,4
Na
4179 4248 4209 4229 4220 4237 4296 4354 4230
4244
1,2
P
4086 4137 4073 4024 4109 4144 4093 4068 4042
4086
1,0
Zn
147,3 145,3 146,4 146,2 146,7 148,0 149,8 145,2 146,9
146,8
1,0
Laboratory control sample: IF powder milk based; Infant Food mg/kg
b
Ca
4219 4162 4186 4188 4203 4215 4146 4153 4228
4189
0,7
Cu
3,68
3,46
3,47
3,52
3,56
3,61
3,39
3,56
3,47
3,53
2,5
Fe
55,91 56,67 56,01 58,63 56,98 57,11 57,88 55,51 58,40
57,01
1,9
K
5909 5791 5845 5929 5970 6010 6070 6024 5895
5938
1,5
Mg
491,0 483,8 494,6 491,4 492,7 485,2 485,6 483,6 487,1
488,3
0,8
Mn
1,07
1,12
1,11
1,13
1,11
1,11
1,15
1,11
1,17
1,12
2,6
Na
1818 1801 1831 1821 1831 1846 1840 1877 1802
1829
1,3
P
2353 2317 2338 2329 2374 2402 2376 2371 2339
2355
1,2
Zn
46,01 44,91 43,67 44,52 44,35 43,57 43,57 43,28 45,04
44,32
2,0
ᵃ
Reference values, mg/kg: Ca = 5253 ± 51; Cu = 19.78 ± 0.26; Fe = 17.,6 ± 2.9; K = 9220 ± 110;
Mg = 1648 ± 36; Mn = 49.59 ± 0.97; Na = 4265 ± 83; P = 3990 ± 140; Zn = 151.0 ± 5.6.
b
Interlab values, mg/kg: Ca = 4207 ± 6%; Cu = 3.51 ± 10%; Fe = 56.7 ± 10%; K = 5846 ± 6%;
Mg = 481.9 ± 6%; Mn = 1.13 ± 10%; Na = 1811 ± 6%; P = 2408 ± 6%; Zn = 43.7 ± 10%,
MTE-03-SLV
FOR ERP USE ONLY
DO NOT DISTRIBUTE