Element White Milk Dark
Al n.d.* 5.3 ± 0.2 2.7 ± 1.1
Ba 54.8 ± 4.2 34.7 ± 2.5 13.3 ± 1.2
Cu 88.8 ± 9.1 35.7 ± 2.4 25.5 ± 0.7
Fe 66.7 ± 8.8 8.3 ± 1.3 3.5 ± 0.4
Mn 88.9 ± 6.8 57.6 ± 4.1 28.6 ± 1.9
Sr 86.0 ± 8.7 56.9 ± 3.8 25.0 ± 1.5
Zn 88.7 ± 7.4 37.0 ± 2.7 7.9 ± 1.1
As 61.6 ± 15.1 61.5 ± 27.4 41.9 ± 8.1
Co n.d.* 62.9 ± 4.0 45.3 ± 3.4
Cr n.d.* 35.9 ± 7.5 27.7 ± 5.2
Ni n.d.* 62.8 ± 7.7 50.1 ± 1.8
Se 89.1 ± 8.1 21.8 ± 2.8 8.7 ± 0.7
V 89.3 ± 5.0 n.d.* n.d.*

* n.d.: not determined

Table 4: Bio-accessible fractions (%) of essential and non-essential elements in three types of chocolate bars (n=5).