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Table 1 Concentrations of elements (n = 32; arithmetic mean, ±standard deviation, median, maximum and minimum values) analyzed in breast milk (n = 60) collected in 2002-2009 from Swedish mothers at 2-3 weeks postpartum, limit of detection (LOD), % of samples below LOD and inter-individual variation (Coefficient of variation; CV)

From: Metals and trace element concentrations in breast milk of first time healthy mothers: a biological monitoring study

Element LODa % < LOD Mean ±SD Median Min Max CV
Ag (μg/L) 0.0010   0.080 0.098 0.046 0.016 0.70 1.22
Al (μg/L) 12   185 584 76 21 4393 3.2
As (μg/L) 0.0070   0.55 0.70 0.33 0.041 4.6 1.3
B (μg/L) 0.26   24 10 22 8.2 63 0.44
Ba (μg/L) 0.015   12 1.8 12 8.8 22 0.15
Be (μg/L) 0.00048 50 0.002 0.007 0.002 n.d. 0.022 2.9
Ca (mg/L) 4.6   305 45 307 196 416 0.15
Cd (μg/L) 0.0027   0.086 0.045 0.075 0.028 0.27 0.52
Co (μg/L) 0.0018   0.059 0.050 0.047 0.022 0.38 0.85
Cr (μg/L) 0.10 15 0.30 0.27 0.23 0.026 1.6 0.89
Cs (μg/L) 0.00028   2.8 1.6 2.5 1.1 11 0.57
Cu (μg/L) 0.055   471 75 471 327 670 0.16
Fe (μg/L) 1.6   339 134 309 135 794 0.39
K (mg/L) 12   633 40 636 549 729 0.06
Li (μg/L) 0.034   1.4 0.32 1.4 0.79 2.8 0.23
Mg (mg/L) 0.0028   28 4.8 28 21 43 0.17
Mn (μg/L) 0.010   3.0 1.4 2.6 0.79 8.4 0.48
Mo (μg/L) 0.0025   3.5 2.7 2.4 0.80 12 0.80
Na (mg/L 0.0050   217 77 192 136 480 0.36
Ni (μg/L) 0.085 75 0.96 6.5 <0 n.d. 47 6.8
P (mg/L) 0.023   172 23 171 126 233 0.13
Pb (μg/L) 0.17   1.5 0.90 1.2 0.74 6.4 0.62
Rb (μg/L) 0.044   714 108 701 484 1038 0.15
S (mg/L) 0.17   158 20 156 118 209 0.13
Sb (μg/L) 0.0013   0.042 0.029 0.031 0.018 0.15 0.69
Se (μg/L) 0.0055   13 2.6 12 8.8 18 0.20
Sn (μg/L) 0.24 3 0.40 0.099 0.38 0.21 0.77 0.25
Sr (μg/L) 0.018   33 12 31 15 79 0.35
Th (μg/L) 0.0006   0.020 0.006 0.019 0.009 0.042 0.28
U (μg/L) 0.0009   0.42 0.40 0.30 0.0097 2.0 0.97
V (μg/L) 0.0031   0.050 0.069 0.039 0.015 0.56 1.4
Zn (μg/L) 0.086   3471 979 3524 1238 5710 0.28
  1. aLOD: 3*SD of mean of chemical blanks.