3M™ Empore™ Anion Exchange-SR 90 mm Disk

Manufacturer 3M Bioanalytical

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3M Bioanalytical's Anion-SR is a poly(styrenedivinylbenzene) copolymer that has been modified with quaternary ammonium groups. 

Note that the 3M Anion-SR is not bonded to silica but is a 100% copolymeric particle that is spherical, porous and cross-linked.  The functional group imparts unique selectivity for anionic analytes, such as Endothall, Dalpon and haloacetic acids.