What is the correspondence between sample amount, water content of the sample and delivered titrant volume when running Karl Fischer titration?

Document ID

Document ID TE11975

Published Date

Published Date 10/22/2019
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Question
What is the correspondence between sample amount, water content of the sample and delivered titrant volume when running Karl Fischer titration?
Answer
The lower the water content the higher the sample amount must be to have enough water to titrate. The necessary Karl Fischer titrant amount to reach the equivalence point is dependent on two parameters:
  1. Titrant concentration: 2 mg/ml or 5 mg/ml.
  2. Water content of the sample


The tables below give the correspondence between sample amount, water content of the sample and delivered titrant volume.
     
Titrant: 2 mg/ml Volume Water Content of Sample Sample Amount
1 ml 100% 2 mg
1 ml 10% 20 mg
1 ml 1% 200 mg
1 ml 0.1% (1000 ppm) 2 g
1 ml 0.01% (100 ppm) 20 g
1 ml 0.001% (10 ppm)  NA
     
     
Titrant: 5 mg/ml Volume Water Content of Sample Sample Amount
1 ml 100% 5 mg
1 ml 10% 50 mg
1 ml 1% 500 mg
1 ml 0.1% (1000 ppm) 5 g
1 ml 0.01% (100 ppm) 50 g
1 ml 0.001% (10 ppm)  NA
       
 
 

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