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IonPac AS18 Hydroxide-Selective Anion-Exchange Column

For Determination of Inorganic Anions and Low-Molecular-Weight Organic Acids

The IonPac^? AS18 anion-exchange column is the hydroxide-selective column of choice for compliance monitoring of inorganic anions in drinking water and wastewater samples in accordance with US EPA Methods 300.0 (A) and 300.1.

The new IonPac AS18-Fast columns offer the same selectivity as the AS18 analytical scale columns, but with a reduced length of 150 mm, these columns can separate the common inorganic anions in significantly less time. The capillary format offers the advantage of reduced eluent consumption, thereby lowering operating costs.

Fast separation of the common inorganic anions (4 min) using the AS18-Fast columns
Recommended hydroxide-selective column for inorganic anions in diverse sample matrices
Isocratic separation of common inorganic anions in 9 minutes
Inorganic anion and low-molecular weight organic acids in complex sample matrices
Superior retention and quantification of fluoride, acetate, and formate
Meets performance requirements specified in US EPA Method 300.0 (A)

The IonPac AS18 column can determine inorganic anions and low-molecular-weight organic acids in a variety of sample matrices. This column has excellent retention of fluoride from the water dip. It is approved for compliance monitoring of inorganic anions in drinking water and wastewater samples in accordance with US EPA Methods 300.0 and 300.1. The AS18 column is now available in capillary format providing the advantage of reduced eluent consumption, thereby lowering operating costs.

IonPac^? AS18 Anion-Exchange Column Specifications
Dimensions	IonPac AS18 Analytical Column: 2 × 250 mm and 4 × 250 mm IonPac AG18 Guard Column: 2 × 50 mm and 4 × 50 mm IonPac AS18 Capillary Column: 0.4 × 250 mm IonPac AG18 Capillary Guard Column: 0.4 × 50 mm IonPac AS18-Fast Analytical Column: 2 × 150 mm and 4 × 150 mm IonPac AG18-Fast Guard Column: 2 × 30 mm and 4 × 30 mm IonPac AS18-Fast Capillary Column: 0.4 × 150 mm IonPac AG18-Fast Capillary Guard Column: 0.4 × 35 mm
Maximum operating pressure	4000 psi (standard and microbore) 5000 psi (capillary)
phase compatibility	pH 0–14; 0–100% HPLC solvents
Latex characteristics	Functional Group: Alkanol quaternary ammonium ion Latex Crosslinking: The effective crossslinking after functionalization is 8% Latex Diameter: 65 nm Hydrophobicity: Low
Substrate characteristics	Bead Diameter and Pore Size: 7.5 ?m (0.4 × 250, 2 × 250, 4 × 250, 0.4 × 150 mm, 2 ×150 and 4 × 150); supermacroporous resin (2000 ?) 13 ?m (0.4 x 50 mm, 2 × 50, 4 × 50, 2 × 30, 4 × 30, and 0.4 × 35 mm); microporous resin (<10 ?) Crosslinking (%DVB): 55%
Capacity	1.71 ?eq (0.4 × 150 mm capillary column) 0.07 ?eq* (0.4 × 35 mm capillary guard column) 2.85 ?eq (0.4 × 250 mm capillary column) 0.10 ?eq* (0.4 × 50mm capillary guard column) 171 ?eq (4 × 150 mm analytical column) 6 ?eq* (4 × 30 mm guard column) 45 ?eq (2 × 150 mm analytical column) 1.5 ?eq* (2 × 30 mm guard column) 75 ?eq (2 × 250 mm analytical column) 2.5 ?eq* (2 × 50 mm guard column) 285 ?eq (4 × 250 mm analytical column) 10 ?eq* (4 × 50 mm guard column) *Guards are packed with a low-capacity microporous resin.
Column construction	PEEK with 10-32 threaded ferrule-style end fittings. All components are nonmetallic.

Analytical Columns
IonPac AS18 4 mm Analytical Column (4 x 250 mm)	060549
IonPac AS18 2 mm Analytical Column (2 x 250 mm)	060553
IonPac AS18-Fast Capillary Column (0.4 x 150 mm)	072062
IonPac AS18-Fast Analytical Column (4 x 150 mm)	075760
IonPac AS18-Fast Analytical Column (2 x 150 mm)	075759
IonPac AS18 Capillary Column (0.4 x 250 mm)	075772

Guard Columns
IonPac AG18 4 mm Guard Column (4 x 50 mm)	060551
IonPac AG18 2 mm Guard Column (2 x 50 mm)	060555
IonPac AG18-Fast Capillary Guard Column (0.4 x 35 mm)	072063
IonPac AG18-Fast Guard Column (4 x 30 mm)	075762
IonPac AG18-Fast Guard Column (2 x 30 mm)	075761
IonPac AG18 Capillary Guard Column (0.4 x 50 mm)	075773