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Dionex OnGuard II A 2.5cc Cartridges, a product of Thermo Scientific Product number 057092, Lot number 220212-2.5-A Manufactured 02/12/2022, Best if used by 02/28/2023. Description from manufacturer's website: Remove inorganic anions and strong organic acids contaminants from
sample matrices and neutralize highly acidic samples to improve ion
chromatography (IC) performance and facilitate trace ion analysis.
Performed prior to IC analysis, the Thermo Scientific™
Dionex™ OnGuard™ II A Cartridges are an off-line sample preparation
technique that eliminates these matrix interferences using
styrene-based, anion-exchange resin in the bicarbonate. Ships with USPS or FedEx