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Analysis of chlorine-oxygen gas mixtures
- Source :
- The Analyst. 112:1289
- Publication Year :
- 1987
- Publisher :
- Royal Society of Chemistry (RSC), 1987.
-
Abstract
- A simple, inexpensive method has been devised for the analysis of chlorine-oxygen gas mixtures using a flow system, i.e., a system in which the gas sample under test is injected into a mixing chamber and swept out by an inert carrier gas (N2) to a chlorine trap and then an oxygen detector. Any chlorine gas (down to ca. 10 µl) present in the injected sample was found to be reduced quantitatively by the iodide present in the trap solution placed directly after the mixing chamber. The amount of triiodide formed as a result of this reaction was then determined spectrophotometrically. Removal of the chlorine by the iodide trap allowed any oxygen (down to ca. 20 µl) present in the sample then to be detected using an oxygen membrane polarographic detector (O2-MPD). In addition, a chemical system for the in situ generation of accurately known amounts of chlorine gas was developed and the wide range over which it can be applied (10 ml-10 µl) was demonstrated using the flow system. In the chemical system, accurately known amounts of CeIV ions were injected into a strong brine solution (2 mol l–1) to which a small amount of thermally activated RuO2.xH2O had been added. The thermally activated RuO2.xH2O acted as a redox catalyst for the quantitative reduction of the injected CeIV ions by the chloride ions via the reaction 2Ce4++ 2Cl–→ 2Ce3++ Cl2. Interestingly, in the absence of brine, this chemical system will generate oxygen via the quantitative reduction of the injected CeIV ions by water, i.e., 4Ce4++ 2H2O → 4Ce3++ 4H++ O2. As a result, it can also be used to generate accurately known amounts of oxygen and chlorine. This chemical system provided a useful method for calibrating the flow system for the accurate determination of small amounts of chlorine (
- Subjects :
- chemistry.chemical_classification
Polarography
Iodide
Analytical chemistry
chemistry.chemical_element
Biochemistry
Oxygen
Chloride
Analytical Chemistry
Ion
chemistry.chemical_compound
Brine
chemistry
polycyclic compounds
Electrochemistry
medicine
Chlorine
Environmental Chemistry
Triiodide
Spectroscopy
medicine.drug
Subjects
Details
- ISSN :
- 13645528 and 00032654
- Volume :
- 112
- Database :
- OpenAIRE
- Journal :
- The Analyst
- Accession number :
- edsair.doi...........e7a8bd769e453c638746c6d51589048a