Quality Control Material | Descriptions | Amounts of toxic metals (ng/g) | |||
---|---|---|---|---|---|
Pb | Cd | As | Hg | ||
IAEA 086 Methyl mercury, total mercury in human hair | analytical value ± uncertainty | nd | nd | nd | 573 ± 39 |
obtained result average ± SD | nd | nd | nd | 530 ± 24 (n = 32) | |
NIST 8435 Whole milk powder | reference value ± uncertainty | 110 ± 50 | nd | nd | nd |
obtained result average ± SD | 90 ± 5 (n = 8) | nd | nd | nd | |
BCR 150 Trace elements in a spiked skim milk powder | reference value ± uncertainty | 1000 ± 40 | 21.8 ± 1.4 | nd | 9.4 ± 1.7 |
obtained result average ± SD | 1016 ± 40 (n = 8) | 19.7 ± 0.4 (n = 8) | nd | 8.3 ± 0.7 (n = 34) | |
FAPAS 70,172 milk powder inter-comparison material | assigned value ± uncertainty | 66.2 ± 14.6 | 18.6 ± 4.1 | 56.4 ± 12.4 | nd |
obtained result average ± SD | 48.9 ± 3.5 (n = 8) | 17.0 ± 1.1 (n = 8) | 46.9 ± 3.0 (n = 5) | nd |