The available concentration of As followed a different pattern than Cd,
Zn and Cu (Table 1).
Available As concentrations decreased with distance from the mine, similar to the total concentrations (S3 N S2 N S4 N S5).
However, the available concentrations of Cd, Zn, and Cu were higher in S2 than in S3 despite the total concentrations of these metals being 2, 6 and 4-fold higher, respectively, than in soil 3.
A high availability of hazardous elements is expected in these soils due to pH values below or close to 5.5 and low organicmatter content.
Soil 2 showed the highest availability formetals with available concentrations of 10% for Cd and Zn, and 4% for Cu.
In contrast, S3's metal availability was the lowest, with values of 1, 0.1 and 0.5% of total Cd, Zn and Cu, respectively, despite having the lowest pH measured.
The available concentration of As followed a different pattern than Cd,Zn and Cu (Table 1). Available As concentrations decreased with distance from the mine, similar to the total concentrations (S3 N S2 N S4 N S5).However, the available concentrations of Cd, Zn, and Cu were higher in S2 than in S3 despite the total concentrations of these metals being 2, 6 and 4-fold higher, respectively, than in soil 3. A high availability of hazardous elements is expected in these soils due to pH values below or close to 5.5 and low organicmatter content. Soil 2 showed the highest availability formetals with available concentrations of 10% for Cd and Zn, and 4% for Cu. In contrast, S3's metal availability was the lowest, with values of 1, 0.1 and 0.5% of total Cd, Zn and Cu, respectively, despite having the lowest pH measured.
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