Please use this column with suppressor type ion chromatography system.

The concentration of sulfur dioxide or sulfite in a pair of disposable wooden chopsticks was decided ≥4 mg（sulfur dioxide equivalent) in Shoku-An No.1113001 (November 13, 2007) of Department of Food Safety, Pharmaceutical and Food Safety Bureau, MHLW. After preparing disposable wooden chopsticks according to the offial method, sulfite was analyzed using a column for anions analysis, IC SI-35 4D.

Preparation of Sample
Pour 25 mL of water into the stoppered test tube (25 mL) and warm it to 95 °C.
Cut one disposable wooden chopstick into two pieces, soak the peices in heated water (95 °C) for 30 minutes, and then remove from the solution.
After the solution cooled downm, dilute 5 mL of the cooled solution with 20 mL of water and filter using a 0.45 μm membrane filter before injection.


Sample : 50 μL
1. SO₃^2-

Column       : Shodex IC SI-35 4D (4.0 mm I.D. x 150 mm)
Eluent       : 3.2 mM Na2CO3 + 1.9 mM NaHCO3 aq.
Flow rate    : 0.6 mL/min
Detector     : Suppressed conductivity
Column temp. : 40 °C