MEASURING CELL FOR COULOMETRIC TITRATION

摘要

The subject-matter of the invention is a measuring cell for coulometric titration. Its aim is to guarantee a high measurement accuracy while avoiding a high outlay on apparatus. Another aim is that it should be possible for the measurement cell to be used for different types of end-point determination. The object is to provide a compact measuring cell of simple design, which is free from environmental disturbances and has a precise dosing of samples. According to the invention, the measuring cell is composed of an auxiliary electrode segment, an indicator segment, a dosing segment and a pump segment. The segments are penetrated by two outer and one inner bore, which are connected in the vicinity of the generator electrodes. Inserted in the inner bore is a guide tube on which the indicator elements are arranged opposite one another. The dosing segment is constructed as a pivotable sampling valve. The rotor of a magnetic centrifugal pump is accommodated in an extension of the inner bore situated near the working electrode.