[OLD] Arsenic (As)

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From: Paul Foellbach

Subject: Arsenic (As)

I attempt to work with the element Arsenic (As). The basis contains H2AsO4-. Is it possible to constrain a fluid composition by the concentration of the element As, for example As= 0.31 umolal) ? Or is the actual thermodynamic knowledge of As limited to species like H2AsO4- ?

From: Craig Bethke

Subject: Re: Arsenic (As)

If there is only one basis entry for As (i.e., if you haven't decoupled any As redox reactions), then the arsenic concentration in umolal units expressed as elemental As is the same as concentration expressed in terms of the basis entry H2AsO4-, so you can enter these values to React directly.