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Composition
Coulometry normally necessitates two reagent solutions, an anolyte and a catholyte. The anolyte is added to the anodic compartment and the catholyte to the cathodic compartment.
HYDRANAL®-Coulomat A reagents are used as anolyte. Every anolyte contains iodide and a sulphur dioxide/imidazole buffer in a suitable solvent. HYDRANAL®-Coulomat C reagents are used as catholytes.
Toxicity
HYDRANAL®-Coulomat G-Types have been developed as anolyte as well as catholyte.
These reagents are:
- Pyridine free.
- Chloroform free.
- Carbon tetrachloride free.
- 2-methoxyethanol free.
HYDRANAL®-Coulomat G reagents contain methanol as the only hazardous component. The non-toxic HYDRANAL®-Coulomat E is mainly based on ethanol and does not wear the skull and crossbones on the label.
Stability
All reagents have a shelf life of at least five years, as long as the bottles remain unopened.
Advantages of the coulometric titration
- Easy to use.
- High accuracy.
- Suitable for the determination of 10 mg - 10 mg of water.
- Reagents available with and without halogenated hydrocarbons.
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Literature
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