The following examples demonstrate sample neutralization can be performed with the Thermo Scientific Dionex IonPac AS12A column using the ADRS 600 suppressor

Sample

100 µL of 25% NaOH neutralized in the SP10 AutoNeutralizer

Concentrator Column

Low-Pressure Trace Anion Concentrator (i.e., Dionex IonPac UTAC-XLP2, Item # 072781)

Column

Dionex IonPac AG12A + Dionex IonPac AS12A

Eluent

2.7 mM Na2CO3/0.3 mM NaHCO3

Eluent Flow Rate

1.5 mL/min

Electrolytic Suppressor

Dionex Anion Dynamically Regenerated Suppressor, Dionex ADRS 600

Recycled Eluent Mode

or Chemical Suppressor

Dionex Anion Chemically Regenerated Suppressor, Dionex ACRS 500

Chemical Regenerant

50 mN H2SO4

Expected Background Conductivity

14–16 µS

Peak Assignment/Sample Concentration

See the table below.

Dionex IonPac AS12A Isocratic Analysis of Blank, Standard, 25% NaOH Sample and Spiked 25% NaOH Sample
Recovery Data for the Dionex IonPac AS12A Analysis of 25% NaOH1)

 

Spiking Standard Conc.
(mg/L)

25% NaOH Conc.
(mg/L)

Expected Spiked Value Conc.
(mg/L)

25% NaOH Spiked Conc.
(mg/L)

Chloride

0.100

0.155 ± 0.003

0.25

0.258 ± 0.004

Bromide

0.100

ND2)

0.100

0.099 ± 0.008

Chlorate

0.100

ND

0.100

0.099 ± 0.009

Nitrate

0.100

0.011 ± 0.006

0.111

0.199 ± 0.013

Phosphate

0.100

0.106 ± 0.025

0.206

0.183 ± 0.017

Sulfate

0.200

0.348 ± 0.004

0.548

0.553 ± 0.011

Oxalate

0.100

0.134 ± 0.028

0.234

0.238 ± 0.022