Skip to main content

Table 2 Amounts of toxic metal obtained for reference materials used for quality control

From: Cross-sectional assessment of infants’ exposure to toxic metals through breast milk in a prospective cohort study of mining communities in Ghana

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

  1. nd not determined