Abstract.
A flow analysis system with an amperometric H2S detector and a gas extraction unit as well as an integrated coulometric calibration unit is described, which allows an on-line determination of hydrogen sulphide in aquatic samples. By variation of different parameters (e.g. flow rate, gas injection volume, pH of solution) a wide dynamic working range of concentrations from 1 μmol/l H2S to 750 μmol/l is accessible. The sampling rate is about 36 samples h−1 using an average flow rate of 1.78 ml/min and a gas injection volume of 28 μl. The measuring system is designed as a portable device. In combination with the polyethylene-tube of a PTFE-underwater pump field-measurements on board are possible.
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Received: 16 February 1995/Revised: 5 April 1995/Accepted: 11 April 1995
Acknowledgements. This work was supported by the Bundesminister für Forschung und Technologie under the project “DYSMON II” (03F0123D) and by the Fonds der Chemischen Industrie zur Förderung von Chemie und Biologischer Chemie.
Correspondence to: P. Jeroschewski
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Jeroschewski, P., Braun, S. A flow analysis system with an amperometric detector for the determination of hydrogen sulphide in waters. Fresenius J Anal Chem 354, 169–172 (1996). https://doi.org/10.1007/PL00012724
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DOI: https://doi.org/10.1007/PL00012724