Elements Plant/soil mg kg-1 Reference As Soil 7.2 [28] Pb Soil 19 [28] Ni Soil 19 [28] Cr Plant 18 [40] Co Plant 2.75 [22] Cd Soil/Plant 0.35-0.40 [28,29] Se Soil 1 [41] Mo Plant 1 [36] Hg Plant 0.16 [37]

Table 4: Baseline heavy metal concentrations in soils and plants.