ClT‐3 — ein neues Gerät für die Chloridbestimmung in der Wasseranalytik

Abstract

* it'asserwirtschaftsdirektion Saale-Werra, OberfluIJmeisterei Erfurt, Erfurt C1T-3 -ein neues Gerat fur die Chloridbestimmung in der Wasseranalytik,Su,,/ t m r y : The device is used for the coulometria titration of chloride with electrolyt.ically generat,ed silver ions and biamperometric end-point indication via a second pair of silver electrodes. The device consists of the external measuring cell with the generator-and indicator-eleotrode systems a,nd a magnetic stirrer as well as the titrator proper, which contains all electric and elect.ronic components for the realization of the course of measurements up t o the digital display of measured valuos. Four modes of operation can be chosen with the units mmol/l CI-or mg CI-in 100 ml sample and sample volumes of 50 p1 and 200 11, the compensation of systematic dosing errors or t.he taking into account of constant matrix effects being possible by means of a steplessly adjustable correction factor between 0.95 and 1.05. The measuring range is 25 ... 2,000 mg/l CIwith variabi1it.y coefficients bet,ween 0.3 and 3 ";o if a microlitre pipette with a PE pipett.e tip is used. An even lower variabilit,y of the results can be expected from an improved sample dosing Dist.rirhanres caused by ions subject t o electrolytic redox processes were detected (Fe, S2-, CrOz-). Einfu hrung