Bone cadmium and lead in the ancient population from El Hierro, Canary Islands

This study was performed to determine the levels of lead (Pb) and cadmium (Cd) in 63 bone samples of the prehispanic population of the island El Hierro, comparing them with the values obtained on 98 prehispanic samples from Tenerife, Fuerteventura, Gran Canaria, and La Palma, all of them in the Canary Islands, and with eight modern samples who served as controls. Prehispanic individuals from El Hierro showed the lowest bone Pb values of all the archipelago (0.72+/-1.01 mg/kg), significantly different (F=6.9, p<0.001) from the values obtained for the population of other islands such as Tenerife (4.87+/-5.36 mg/kg) or Fuerteventura (4.45+/-7.85 mg/kg) and also from those of the modern population (30.53+/-14.62 mg/kg). On the other hand, bone Cd, although slightly lower in the ancient population groups, was not significantly different when compared with the modern one. In addition, no differences were observed in bone Cd among the ancient population of the different islands. Bone lead but not cadmium kept an inverse significant relationship with the distance of the burial site both to south Spain (r=-0.31) and Atlantic Morocco (r=-0.28, p<0.001 in both cases).