Arsenic chemistry of hydrothermal fluids

H3ASO30 is the dominant dissolved arsenic species in most hydrothermal fluids because the fluids originate in reducing environments and mostly have pH values of 0-8 (Ballantyne and Moore, 1988, 478 Pokrovski et al., 1996 Chapter 2). The concentrations and compositions of dissolved arsenic species in hydrothermal 

Location of hot spring or well sample (number of samples) Temperature (°C) PH Arsenic concentration (mg kg x)a Reference 

Dominica Valley of Desolation-Boiling Lake Boiling Spring 97 3.48 0.0055 (98 % As(lll)) (0.45 pm filtered) Criaud and Fouillac (1989) 

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