Remove trace anion contaminants from hydroxide or borate eluents with the Thermo Scientific™ Dionex™ IonPac™ ATC-3 and Dionex IonPac ATC 500 Anion Trap Columns. These trap columns are installed in the eluent line after the pump prior to the injection valve to prevent spurious peaks and to minimize base line shifts during gradient operation. The Dionex IonPac ATC 500 is identical to the Dionex IonPac ATC-3, but is packed in a column body that is compatible with the nonstop operation of high-pressure ion chromatography Thermo Scientific™ Dionex™ HPIC™ system pressures up to 5000 psi (34.5 MPa).