Analytical Method: Analytical Quality Assurance, Standard for COD

Reagents:
Cat.No. 102400  Potassium hydrogen phthalate for analysis, volumetric standard
Cat.No. 116754  Water for analysis
 
Preparation of a standard solution:
Dissolve 0.851 g of potassium hydrogen phthalate 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 COD. 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 one month. When stored under appropriate cool conditions (refrigerator), the diluted investigational solutions remain stable - depending on the respective concentration - for approximately one week to one month.

 

For use with test kits:

 

Measuring range
in mg/l COD

114560

Spectroquant® COD Cell Test

4.0 - 40.0

101796

Spectroquant® COD Cell Test

5.0 - 80.0

114540

Spectroquant® COD Cell Test

10 - 150

114895

Spectroquant® COD Cell Test

15 - 300

114690

Spectroquant® COD Cell Test

50 - 500

114541

Spectroquant® COD Cell Test

25 - 1500

114691

Spectroquant® COD Cell Test

300 - 3500

114555

Spectroquant® COD Cell Test

500 - 10 000

109772

Spectroquant® COD Cell Test (Hg free)

10 - 150

109773

Spectroquant® COD Cell Test (Hg free)

100 - 1500

118750

Spectroquant® COD Cell Test for photometers of other manufacturers

0 - 40

118751

Spectroquant® COD Cell Test for photometers of other manufacturers

0 - 150

118752

Spectroquant® COD Cell Test for photometers of other manufacturers

0 - 1500

118753

Spectroquant® COD Cell Test for photometers of other manufacturers

0 - 15000

 

Materials

     
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