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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.
Fast separation of perchlorate prior to MS/MS detection
Optimized for methylamine or hydroxide phases
Specified column for US EPA Method 331.0
Optimum capacity: 45 μeq per column (2 × 250 mm)
Operates at ambient or elevated temperatures
Compatible with organic solvents
The AS21 2 × 250 mm column format was specifically developed for MS/MS compatibility to allow use of volatile phases such as methylamine.
| IonPac AS21 Anion-Exchange Column Specifications | |
|---|---|
| Dimensions: | IonPac AS21 Analytical Column: 2 × 250 mm IonPac AG21 Guard Column: 2 × 50 mm |
| Maximum Operating Pressure: | 3000 psi |
| Phase Compatibility: | pH 0–14; 0–* HPLC solvents |
| Substrate Characteristics: | Bead Diameter and Pore Size: 7 µm (2 × 250 mm); super macroporous resin (2000 Å) 11 µm (2 × 50 mm); microporous resin (<1 Å) Crosslinking (%DVB): 55% |
| Ion Exchange Group: | Functional Group: Alkanol quaternary ammonium ion |
| Functional Group Characteristics: | Ultralow Hydrophobicity |
| Capacity: | 45 µeq (2 × 250-mm analytical column) 1.5 µeq* (2 × 50-mm guard column) *Guards are packed with a low-capacity microporous resin. |
| Column Construction: | PEEK with 10–32 threaded ferrule style end fittings. All components are nonmetallic. |
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