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

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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 0.195g of reagent grade sodium 1-octanesulfonate and 1.22g 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 0.2μm membrane filter before use.
Detection limit
F-
3ng
(15μg/L)
Cl-
2ng
(10μg/L)
NO2-
8ng
(40μg/L)
Br-
13ng
(65μg/L)
NO3-
7ng
(35μg/L)
SO42-
14ng
(70μg/L)
( ) : Concentration of detection limit at 200μL injection
Column       : Shodex IC I-524A (4.6mmI.D. x 100mm)
Eluent       : 0.9mM Sodium 1-octanesulfonate + 20mM Boric acid aq.
Flow rate    : 1.2mL/min
Detector     : Non-suppressed conductivity
Column temp. : 40℃