REMOTOX® is a calcium polysulfide based liquid consisting of multiple sulfur compounds that strongly bond to heavy metals in water. The metal sulfides formed have a very low solubility and persist as stable solids, which allows for a more environmentally sound disposal.
When mixed with water, Calcium Polysulfide dissociates to form bisulfide, aqueous hydrogen sulfide and other sulfur compounds, Heavy metal ions are precipitated as metal sulfides by these breakdown products. Metal sulfides are far less soluble than metal hydroxides. Metal hydroxides change solubility with changes in pH. Metal sulfides remain insoluble within a wide pH range. See Solubility of Metal Hydroxides and Sulfides as a Function of pH.
While effective treatment can be achieved over a wide pH range, best results are typically obtained within pH 7-10. Adjustments to pH of the treatment liquids can enhance the metal precipitation process. See Treatment of Soluble Metal Streams by Calcium Polysulfide.
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