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

Reagents:
Cat.No. 102404  Potassium iodate volumetric standard
Cat.No. 105043  Potassium iodide for analysis
Cat.No. 109072  Sulfuric acid 0.5 mol/l
Cat.No. 109136  Sodium hydroxide solution 2 mol/l
Cat.No. 116754  Water for analysis
 
Preparation of a KlO3 stock solution:
Dissolve 1.006 g of KlO3 in 250 ml of water for analysis in a calibrated or conformity-checked 1000-ml volumetric flask. Subsequently make up to the mark with water for analysis.
 
Preparation of a KlO3/Kl standard solution:
Transfer 15.0 ml of the KlO3 stock solution to a calibrated or conformity-checked 1000-ml volumetric flask, add approx. 1 g of Kl and make up to the mark with water for analysis. 1 ml of this solution is equivalent to 0.015 mg of free chlorine.
 
Preparation of the chlorine standard solution:
Pipette 20.0 ml KlO3/Kl standard solution into a calibrated or conformity-checked 100-ml volumetric flask, add
2 ml of H2SO4  0.5 mol/l, leave to stand for 1 min, and then add NaOH 2 mol/l dropwise (approx. 1 ml) until the solution just loses its color. Subsequently make up the solution to the mark with water for analysis. The concentration of the solution is 3.00 mg/l free chlorine.
 
Stability:
The KlO3 stock solution remains stable for 4 weeks when stored in a cool place. The KlO3/Kl standard solution can be used for 5 hours when stored in a cool place. The dilute iodine standard solution is not stable and must be used immediately.
 
 

For use with test kits:

 

Measuring range
in mg/l Cl2

117925

MQuantTM Chlorine Test (free chlorine)

4 - 120

117924

MQuantTM Chlorine Test (free chlorine)

25 - 500

114434

MColortestTM Chlorine Test (free chlorine)

0.01 - 0.3

111174

MColortestTM Chlorine and pH Test (free + total chlorine)

0.1 - 1.5

  

 
 

111157

MColortestTM Chlorine and pH Test (free + total chlorine) refill pack for 111174

 

111113

MColortestTM Chlorine Test Reagent Cl2-1

 

111114

MColortestTM Chlorine Test Reagent Cl2-2

 

111160

MColortestTM Chlorine and pH Test (free chlorine)

0.1 - 1.5

114670

MColortestTM Chlorine Test (free chlorine)

0.1 - 2

114978

MColortestTM Chlorine Test (free chlorine, liquid)

0.1 - 2

114979

MColortestTM Chlorine Test (free chlorine, liquid)
refill pack for 114978 

 

1.14801

MColortestTM Chlorine Test (free + total chlorine, liquid)

0.1 - 2

114803

MColortestTM Chlorine Test (free + total chlorine, liquid)
refill pack for 114801

 

114976

MColortestTM Chlorine Test (free chlorine)

0.25 - 15

114977

MColortestTM Chlorine Test (free chlorine)
refill pack for 114976

 

114826

MColortestTM Chlorine Test (free + total chlorine)

0.25 - 15

118326

MColortestTM Chlorine Test (free + total chlorine)
refill pack for 114826

 

116896

Reflectoquant® Chlorine Test (free + total chlorine)

0.5 - 10.0

100595

Spectroquant® Chlorine Cell Test (free chlorine)

0.03 - 6.00

100598

Spectroquant® Chlorine Test (free chlorine)

0.010 - 6.00

100086

Spectroquant® Chlorine Reagents Cl2-1

0.010 - 6.00

100087

Spectroquant® Chlorine Reagents Cl2-2

0.010 - 6.00

119254

Spectroquant® Chlorine Powder Packs for non-Merck photometers for 10-ml-samples (free chlorine)

0 - 2.00

119256

Spectroquant® Chlorine Powder Packs for non-Merck photometers for 25-ml-samples (free chlorine)

0 - 10.00

100597

Spectroquant® Chlorine Cell Test (free + total chlorine)

0.03 - 6.00

100599

Spectroquant® Chlorine Test (free + total chlorine)

0.010 - 6.00

 

Materials

     
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