Analytical Method: Analytical Quality Assurance, Standard for Free Chlorine (dichloroisocyanuric acid)

Preparation of a standard solution for free chlorine

Reagents:
Cat.No. 110888 Dichloroisocyanuric acid sodium salt for analysis
Cat.No. 116754 Water for analysis

Preparation of a standard solution:
Dissolve 1.850 g of dichloroisocyanuric acid sodium salt with water for analysis in a calibrated or conformity-checked 1000-ml volumetric flask and make up to the mark with water for analysis. The stock solution prepared according to this procedure has a concentration of 1000 mg/l free chlorine.

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

Stability:
When stored in a cool place (refrigerator), the stock solution and the diluted investigational solutions remain stable for one day.