Results and Discussion
The concentration of Zn varied between 10 and 500
Ilg!kg, with the exception of a few samples which had
higher concentrations. Figure 1 a shows the distribution of
the total Zn concentrations. Most of them lie between 10
and 230 Ilg!kg, with about 30% of the samples lying between
30 and 70 Ilg!kg of Zn.