Table 3.

Mean and standard deviation of physicochemical, potentially toxic elements and bacteriological parameters in river water in the central region of Peru.

Physicochemical and biological indicators	Chia	Cunas	Miraflores	Shullcas
T (°C)	11.707 ± 0.821	10.942 ± 0.488	9.15 ± 0.055	9.85 ± 1.015
pH	8.336 ± 0.096	7.902 ± 0.455	8.0817 ± 0.1665	8.2883 ± 0.1501
DO (mg/l)	7.437 ± 0.404	7.982 ± 0.75	5.578 ± 0.176	6.175 ± 0.524
EC (µS/cm)	355 ± 45.7	377.7 ± 57.4	141.17 ± 5.81	288.17 ± 6.88
TDS (mg/l)	216.7 ± 28.8	238.17 ± 11.25	81 ± 8.29	491.5 ± 17.81
TSS (mg/l)	950.2 ± 101.8	873.8 ± 81	1019.3 ± 120.8	1079.3 ± 163
Cadmium (μg/L)	0.06 ± 0	0.057 ± 0.014	0.06 ± 0	0.17 ± 0.079
Arsenic (μg/L)	13.1 ± 5.32	3.533 ± 0.692	1.45 ± 0.327	5.467 ± 0.989
Chrome (μg/L)	0.817 ± 0.248	1.017 ± 0.183	0.933 ± 0.121	1.017 ± 0.248
Lead (μg/L)	0.148 ± 0.034	1.98 ± 0.018	0.06 ± 0.067	2.25 ± 0.51
Escherichia coli (NMP/100 mL)	52.3 ± 26.9	51.83 ± 22.88	80.8 ± 65.9	28.17 ± 18.33
Pseudomonas aeruginosa (NMP/100 mL)	130.8 ± 64.6	10.85 ± 9.42	31.3 ± 60	1.833 ± 1.602
Enterococci (NMP/100 mL)	337 ± 457	173.5 ± 31.9	71.8 ± 27.7	1.833 ± 1.602