ResinTech - Model SIR-200 -Hydrogen Form Macroporous Mercury Selective Weakly Acidic Cation Resin

• Polymer Structure: Styrene/DVB
• Polymer Type: Macroporous
• Functional Group: Thiol
• Physical Form: Spherical Beads
• Ionic Form (as shipped): Hydrogen
• Water Retention: 38 to 48 percent (H Form)
• Approximate Shipping Weight        : 44 lbs/cu.ft. (H Form)
• Screen Size Distribution : 16 to 50 (U.S. Mesh)
• Maximum Fines Content: 1 percent (less than 50 Mesh)
• Minimum Sphericity: 95 percent
• Uniformity Coefficient: 1.6 (Approximate)
• Resin Color: White to tan

Precious Metals Removal

Removal of precious metals by ResinTech SISIR-200 generally follows the solubility of that metal in the presence of sulfide ion. Metals load according to their relative sulfide affinities. However, high concentrations of “tramp” metals also load and may prevent loading of more desirable metals. The order of selectivity of Resintech SIR-200 is shown in the following sequence:

Hg>Ag>Cu>Pb>Cd>Ni>Co>Fe>Ca>Na

SIR-200 removes cationic forms of metals. Removal of anionic and zero valent forms of metals is uncertain. Chelating agents such as EDTA interfere with SIR-200’s performance. As pH increases, capacity decreases. For most heavy metals, there is a critical pH above which the metal is no longer present as a free cation. In most cases, the best-suited pH will be less than 7.0. The thiol groups contained in SIR-200 become deactivated at pH greater than 10.

Mercury Removal

ResinTech SISIR-200 has exceptional affinity for cationic forms of mercury and can be used to remove cationic mercury from wastewaters to much less than 1 ppb. Mercury can also be present as part of an organic complex, as an anion, and as an uncharged species. Removal of these species is uncertain. SIR-200 is rapidly degraded by the presence of chlorine and other oxidants and is inactivated at significantly alkaline pH. Due to the possible release of low levels of H2S, SIR-200 is not recommended for use in potable water applications.