Question

. Mineral solubility. At a site in the Tri-State mining district (on the border of Kansas- Missouri-Oklahoma), a stream was measured with the following composition: 7.8 25.2 T (°C) Alk. (as HCOs) SO42- Al Ca Fe 289.3 492.0 1.20 616.0 76.9 9.3 127.3 12 46.4 12.4 Mg Mn Si Trace Metals Ba Cd Pb Sr 9.39 2.1 31.4 0.89 725 In this study, we asked the question: Does the equilibrium solubility of lead mineral phases that may be present explain the lead concentration measured in the stream? The following minerals have these thermodynamic solubility constants: Equilibrium Solubility Constants PbSO4 )(s) (anglesite) PbCOs(s) (cerussite) Pb(OH)2(s) (lead hydroxide) 13.1 18.8

Answer 1