Table 1.

Physicochemical parameters measured in situ.

ID	Sample	pH	T [°C]	Eh [mV]	Oxygen [mg/L]	Conductivity [mS]	Arsenic [mg/L]	Sulfide [mg/L]	Iron [mg/L]
AL	Agua de Limón	2.36	71.1	−67.6	0.3	4.66	0.05	0.5	76.13
B9	Baño 9	2.43	57.0	−137.1	0.3	1.93	0.40	0.4	17.59
LT	Los Tachos	7.66	75.4	147.0	8.2	3.55	0.10	0.1	0.00