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Analysis of Sulfite in Disposable Wooden Chopsticks (SI-35 4D)

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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 0.45μm membrane filter before injection.


Sample : 50μL
1. SO32-


 

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