Figure 2.

Determination of physical-chemical parameters for the 10 sampling points and three sampling dates: (a) temperature, (b) pH, (c) chlorine concentration, (d) turbidity, (e) conductivity, and the heavy metals concentration of (f) Fe, (g) Mn, and (h) Cu. Zn was not detected in the samples and Ni was only detected in samples A from Punto 2 and 3, at 0.001 and 0.003 mg/L, respectively. When observed, significant differences (p < 0.05) between samples are indicated by the letters α, β, γ, ε, and δ.