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.

For use with test kits:		Measuring range in mg/L
110013	MQuantTM Sulfite Test	10 - 400 SO3
111148	MColortestTM Sulfite Test	0.03 - 32.0 SO3
116987	Reflectoquant® Sulfite Test	10 - 200 SO3
114394	Spectroquant® Sulfite Cell Test	1.0 - 20.0 SO3 0.05 - 3.00 SO3
101746	Spectroquant® Sulfite Test	1.0 - 60.0 SO3