Dionex Corporation Home

OnGuard II Na Cartridge

The OnGuard II Na removes high levels of alkaline earth and transition metals from sample matrices without acidifying the sample. This ensures good recovery of acid-labile analytes such as nitrite. These cartridges contain 16% cross-linked, styrene-based, sulfonic acid resin in the sodium form. This resin has very high selectivity for multivalent cations such as calcium, magnesium and transition metals.