High Sensitive Detection Method for Anions (I-524A)

When anion standards are analyzed using an anion analysis column for non-suppressor method, IC I-524A, the eluent of octanesulfonic acid / boric acid is suitable for high sensitive analysis. The background of the eluent is low and baseline drift is small even when a large sample volume, up to 200 μL, is injected. The table below shows the detection limit of each anion.
Please refer to 'Anion Standards (8) (Eluent : Octanesulfonic Acid and Boric Acid)'.

(Preparation of eluent)
1) Put 0.195 g of reagent grade sodium 1-octanesulfonate and 1.22 g of reagent grade boric acid into a volumetric flask.
2) Dilute with purified water to make up a 1 liter solution.
3) Dissolve using an ultrasonic vibrator.
4) Pass through a 0.2 μm membrane filter before use.

 

Detection limit
F-
3 ng
(15 μg/L)
Cl-
2 ng
(10 μg/L)
NO2-
8 ng
(40 μg/L)
Br-
13 ng
(65 μg/L)
NO3-
7 ng
(35 μg/L)
SO42-
14 ng
(70 μg/L)
( ) : Concentration of detection limit at 200 μL injection
 
Column       : Shodex IC I-524A (4.6 mm I.D. x 100 mm)
Eluent       : 0.9 mM Sodium 1-octanesulfonate + 20 mM Boric acid aq.
Flow rate    : 1.2 mL/min
Detector     : Non-suppressed conductivity
Column temp. : 40 ℃

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