SODIUM-ACETATE 2-COMPONENT SOLUTIONS FOR THE KARL-FISCHER-DETERMINATION OF WATER

In the present study a stabilized sodium acetate two-component solutio n for the Karl Fischer determination of water is recommended. Titratio n end-point accuracy as well as its high stability, the possibility of visual detection and storage stability of the reagent are attribute t o the replacement of pyridine by sodium acetate. Changes of these prop erties, caused by varying the composition (base/sulfur dioxide/iodine) or by the exchange of the methanol against 2-methoxyethanol are discu ssed. Precision and accuracy of the results for the water determinatio n with the sodium acetate two-component solution as well as pyridine-f ree commercially available reagent (Merck) are checked with regard to the pyridine Karl Fischer solution.