Arsenic critical constants

Hanlon, D.P. and V.H. Ferm. 1986b. Concentration and chemical status of arsenic in the blood of pregnant hamsters during critical embryogenesis. 1. Subchronic exposure to arsenate using constant rate administration. Environ. Res. 40 372-379. 

With the lowering of the US arsenic drinking water standard (MCL) from 50 to 10 pg L-1 (Appendix E), water treatment facilities may have had to modify their procedures to comply with the new standard. Boccelli, Small and Dzombak (2005) identifies some of the factors associated with Fe(III) chloride coprecipitation that might require modification while still maintaining reasonable costs. Besides the influent arsenic concentration and Fe(III) chloride dose, other critical factors in improving arsenic removal may include pH, the calcium and major anion concentrations of the influent, the volume of sludge, equilibrium sorption constants, and filter efficiency. 

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