Cobalt is a micronutrient with low concentrations in the study area, with a mean value
of 7.9 mg kg-1. Finally, Cd is generally related to human activities and, in spite of its low soil content, Cd is toxic at much lower concentrations than the other elements analysed in this study. The mean Cd value was 0.38 mg kg-1. However, the coefficient of variation was 51%. This
last value may be due to the measurement of some samples by GFAAS because the Cd values were below the detection limit of FAAS. This biased the population in the low value zone and gave a high coefficient of variation.