by Dionex
The AS21 hydroxide-selective anion-exchange column is specifically designed for determination of trace perchlorate in drinking water prior to MS/MS detection. The capacity and selectivity enable fast analysis of perchlorate at low μg/L concentrations. The AS21 is the specified column in US EPA Method 331.0.
The AS21 2 × 250 mm column format was specifically developed for MS/MS compatibility to allow use of volatile mobile phases such as methylamine.
| Vendor | Dionex | Internal Diameter | 2.0 |
| Brand | IonPac AS21 | Pore size | 2000 |
| Modifification | Quaternary ammonium | Max Pressure | 3000 |
| Mode | Anion-Exchange | pH stability from | 0.0 |
| Particle Size | 7.0 | pH stability to | 14.0 |
| Length | 250 |
| Vendor | Brand | Mode | Modification | Int. diam. | Length | Particles | Pores | Price |
|---|---|---|---|---|---|---|---|---|
| Dionex | IonPac AS7 | Anion-Exchange | Quaternary ammonium | 2.0 mm | 250 mm | 10.0 μm | — | On request |
| Dionex | IonPac AS23 | Anion-Exchange | Quaternary ammonium | 4.0 mm | 250 mm | 6.0 μm | 2000 Å | On request |
| Dionex | IonPac AS18 | Anion-Exchange | Quaternary ammonium | 2.0 mm | 150 mm | 7.5 μm | 2000 Å | On request |
| Dionex | IonPac AS19 | Anion-Exchange | Quaternary ammonium | 2.0 mm | 250 mm | — | — | On request |
| Dionex | CarboPac PA100 | Anion-Exchange | Quaternary ammonium | 2.0 mm | 250 mm | 8.5 μm | — | On request |
| Dionex | CarboPac PA20 | Anion-Exchange | Quaternary ammonium | 3.0 mm | 150 mm | 6.5 μm | — | On request |
| GRACE | Alltech IC Allsep Anion | Anion-Exchange | Quaternary ammonium | 4.6 mm | 50 mm | 7.0 μm | — | On request |
| Shodex | QA8 | Anion-Exchange | Quaternary ammonium | 0.5 mm | 50 mm | 12.0 μm | — | On request |
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