| Not official USP-NF text | Column Equivalency Information | |
| PACKING | An anion-exchange resin made of porous polymethacrylate or polyacrylate gel with quaternary ammonium groups, about 10 µm in size. | |
| L23 | BRAND NAME | MANUFACTURER |
| IC-Pak Anion | Waters Corp | |
| IC-Pak Anion HR | Waters Associates | |
| Super-Sep IC Anion | Metrohm-Peak | |