Distribution of Arsenic in geothermal waters in Sabalan area has been studied. In all samples concentration of As exceed the WHO limit for drinking water (10 µg/l) except one sample from Agh-su hot spring. Geothermal well fluids are sodium-chlorate type with extremely high As concentration (up to 3500 µg/l) in comparison with hot spring waters where concentration of As in the range of 0.8-890 µg/l. Concentrations of As are higher in the chloride hot springs than in the acid-sulfate features and increase with increasing temperature and salinity. Positive correlation As with Cl has been detected that is validate for most geothermal fields in the world.

As concentration in studied thermal waters is almost in range or rather lower than levels reported in geothermal waters from other parts of the world except the geothermal fields in Iceland and Hawaii where the As concentration is extremely low (< 0.001mg/l).

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