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OnGuard II Ba Cartridge

The OnGuard II Ba resin is a styrene-based, sulfonic acid resin in the barium form, designed for the removal of high concentrations of sulfate from sample matrices. For reproducible, quantitative determinations in low-ionic-strength samples, activate these cartridges by adding NaCl or other sodium salt.

Samples treated with NaCl should be passed through an On-Guard II Ag cartridge to remove the added chloride, then passed through an OnGuard II H cartridge or MetPac CC-1 chelating column to remove residual silver counter ions.