Coulometric determination of the flow rate of small masses of substances
II. Application to on-line measurement of the EOX-parameter |
| |
Authors: | M Luitjens H Kupka D Gherban E Baumgarten |
| |
Institution: | Str?hlein GMbH & Co. Labor-, Me?- und Umwelttechnik, Girmeskreuzstrasse 55, D-41564 Kaarst, Germany, DE Lenrstuhl für Festk?rperspektroskopie (IPKM), Heinrich-Heine-Universit?t Düsseldorf, D-40225 Düsseldorf, Germany, DE Institut für Physikalische Chemie und Elektrochemie, Lehrstuhl 1, Heinrich-Heine-Universit?t Düsseldorf, D-40225 Düsseldorf, Germany, DE
|
| |
Abstract: | Today’s microprocessor-controlled coulometric systems can generate complex functions obtained from the response of the microcoulometric
cell. A previously developed procedure for determining the flow-rate (mass per unit time of detected species) has been accomplished
by integrating, in the software, the full time dependence of the reaction of the coulometric cell and their electrodes, as
well as of the titration curve. This leads to a time dependence of the measured signal, which has a fast response time without
any delay. The titration curves are determined by means of various procedures. The applicability of the method is demonstrated
for the case of the continuous analysis of the EOX-parameter (Extractable Organic Halogens X=Cl, Br, I) by coupling the coulometric
detection with a FIA system. Results of continuous measurements of aqueous samples containing different chlorinated compounds
as analytes are presented by taking into account different flow velocities in the FIA system as well as different measuring
times. Recovery yields of the FIA system better than 70% have been obtained.
Received: 7 November 1995/Revised: 15 May 1996/Accepted: 18 May 1996 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|