Elimination of Extraneous Water

All extraneous water present in the surrounding air and in the solvents used must be eliminated. Moisture from the air is prevented from entering the system by sealing off the cell from laboratory air. This is accomplished by the use of a rubber septum for sample injection and by the use of water-absorbing material in the other openings to the system. 

The elimination of water from the solvent used is accomplished by a solvent conditioning step in which the moisture in the solvent is actually titrated with iodine prior to introducing the sample. Once the solvent moisture is eliminated, the sample can be introduced and the titration begun. 

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