Analytical Method: Analytical Quality Assurance, Standard for Sulfite

Reagents:
Cat.No. 106657 Sodium sulfite for analysis
Cat.No. 108418 Titriplex® III for analysis
Cat.No. 116754 Water for analysis

Preparation of a standard solution:
Dissolve 1.57 g of sodium sulfite and 0.4 g of Titriplex® III with distilled water in a calibrated or conformity-checked 1000-mL volumetric flask and make up to the mark with distilled water. The stock solution prepared according to this procedure has a concentration of 1000 mg/L sulfite.

Further investigational concentrations may be prepared from this stock solution by diluting accordingly.

Stability:
When stored in a cool place (refrigerator), the stock solution remains stable for only one day.

Materials
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