Dionex IonPac AS27 Hydroxide-Selective Anion-Exchange Column
Trace Analysis of Oxyhalides and Inorganic Anions in Drinking Water Preserved with Ethylenediamine
Achieve high resolution separations of trace oxyhalides and inorganic anions in drinking water using the Thermo Scientific? Dionex? IonPac? AS27 hydroxide-selective anion-exchange column. The selectivity of the
Dionex IonPac AS27 column has been optimized for trace level analysis of
bromate in the presence of ppm levels of ethylenediamine (EDA). EDA is
used as a preservative in some drinking water samples and can cause
interference of early eluting peaks, including bromate. The high
resolution, high capacity and selectivity of the Dionex IonPac AS27
column allows the determination of trace bromate in drinking water
without sample pretreatment or preconcentration. The Dionex IonPac AS27
columns meets the performance requirements of US EPA Methods 300.0 and
300.1.
The Dionex IonPac AS27 column is available in three
formats: 4 × 250 mm, 2 × 250 mm and 0.4 × 250 mm.The Dionex IonPac AS27
Capillary Column is packed with the same material as the equivalent
standard bore version (providing the same performance as a 4 mm column),
but requires only 1/100th the eluent flow rate.The capillary format
provides the advantage of significantly reduced eluent consumption,
which helps reduce operating costs.
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Optimized for analysis of trace bromate in drinking water preserved with EDA
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High capacity: 220 μeq per column (4 × 250 mm)
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Meets or exceeds performance requirements of US EPA Methods 300.0 and 300.1
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Column selectivity is optimized for 30 °C operating temperature
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Compatible with organic solvents
The
Dionex IonPac AS27 column is designed for the analysis of oxyhalides
and common inorganic anions including fluoride, chlorite, bromate,
chloride, nitrite, bromide, chlorate, nitrate, phosphate, and sulfate in
drinking water, groundwater, wastewater, and other diverse sample
matrices. The Dionex IonPac AS27 column allows analysis of most drinking
water preserved with EDA without sample pretreatment or
preconcentration. This column is ideally used with an RFIC system for
automatic eluent generation.
The key application for the Dionex
IonPac AS27 column is the determination of trace bromate in drinking
water matrices that have been preserved with EDA using a potassium
hydroxide gradient with suppressed conductivity detection. The
selectivity of the Dionex IonPac AS27 column ensures that bromate can be
quantified at low μg/L concentrations using suppressed conductivity
detection even in the presence of very high concentrations of chloride,
sulfate, and carbonate as well as EDA.
The Dionex IonPac AS27
column has similar selectivity and capacity compared to the Dionex
IonPac AS19 column and most applications can be performed on either
column. However, for samples preserved with EDA, the Dionex IonPac AS27
column is recommended.
The Dionex IonPac AS27 column produces
under 3000 psi at the standard flow rates and can be operated on any
Dionex IC system, such as the Thermo Scientific? Dionex? ICS-5000+ HPIC? or the Thermo Scientific Dionex ICS-4000 Capillary HPIC system.
Note: Use the Thermo Scientific? Dionex? AERS? 500 Anion Electrolytically Regenerated Suppressor with the Dionex IonPac AS27 column for eluent suppression.
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Dionex IonPac AS27 Anion-Exchange Column Specifications
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Dimensions
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Dionex IonPac AS27 Analytical Column:
2 × 250 mm and 4 × 250 mm
Dionex IonPac AG27 Guard Column:
2 × 50 mm and 4 × 50 mm
Dionex IonPac AS27 Capillary Column:
0.4 × 250 mm
Dionex IonPac AG27 Capillary Guard Column:
0.4 × 50 mm
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Maximum operating pressure
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3000 psi
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Ion-exchange group
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Functional Group: Alkanol quaternary ammonium ion
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Functional group characteristics
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Ultralow hydrophobicity
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Capacity
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2.2 μeq (0.4 × 250 mm capillary column)
0.05 μeq* (0.4 × 50 mm capillary guard column)
55 μeq (2 × 250 mm analytical column)
1.25 μeq* (2 × 50 mm guard column)
220 μeq (4 × 250 mm analytical column)
5 μeq* (4 × 50 mm guard column)
*Guards are packed with a low-capacity microporous resin.
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Column construction
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PEEK with 10-32 threaded ferrule-style end fittings.
All components are nonmetallic.
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Substrate characteristics
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Bead Diameter and Pore Size: 6.5 μm (0.4 x 250, 2 × 250 and 4 × 250 mm);
super macroporous resin (2000 ?)
10 μm (0.4 x 50, 2 × 50 and 4 × 50 mm);
microporous resin (<1 ?)
Cross-Linking (%DVB): 55%
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Mobile phase compatibility
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pH 0–14; 0–100% HPLC solvents
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Analytical Columns
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Dionex IonPac AS27 Analytical Column (4 × 250 mm)
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088437
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Dionex IonPac AS27 Analytical Column (2 × 250 mm)
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088439
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Dionex IonPac AS27 Capillary Column (0.4 × 250 mm)
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088441
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Guard Columns
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Dionex IonPac AG27 Guard Column (4 × 50 mm)
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088438
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Dionex IonPac AG27 Guard Column (2 × 50 mm)
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088440
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Dionex IonPac AG27 Capillary Guard Column (0.4 × 50 mm)
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088442
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