Analysis of Sulfite in Disposable Wooden Chopsticks (SI-35 4D)
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?m membrane filter before injection.
Sample : 50?L
1. SO32-
Â
Column : Shodex IC SI-35 4E (4.0mmI.D. x 150mm)
Eluent : 3.2mM Na2CO3 + 1.9mM NaHCO3 aq.
Flow rate : 0.6mL/min
Detector : Suppressed conductivity
Column temp. : 40°C
