Polymeric packed column suitable for suppressed anion analysis with sodium carbonate/bicarbonate eluent. Recommended for EPA 300/300.1 (A). Base material: polyvinyl alcohol, shipping solvent: 1.8mm sodium carbonate + 1.7mM sodium bicarbonate. PEEK column body requires a PEEK coupler for connecting guard column SI-90G (220-94524-05.) Use coupler 220-91524-99 (1-piece, double ended) or 220-91524-98 (approx. 3" PEEK tubing and fittings.)