Fig. 5
From: Evaluation of the water quality of an artificial inter-andean lake in northern Peru
Comparison of the averages of: (a) As, (b) Cd, (c) Hg, (d) Pb and (e) Zn, with national and international standards. In (b) the EPA and EQS standards have the same maximum limit of 0.005 mg/L for the element Cd; in (c) the CCME, EQS and ECA standards have the maximum limit of 0.001 mg/L, while the EPA standard doubles this maximum limit (0.002 mg/L); in (d) the ECA standard establishes a maximum limit of 0.0025 mg/L for Pb, which is half the maximum limit indicated by the CCME standard (0.005 mg/L); this is why some of the lines indicating the limits overlap in the figures.
