Double indication in catalytic-kinetic analysis: simultaneous photometric and thermometric indication of the iodine-azide reaction in closed and flow systems |
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Authors: | Herbert Weisz Wolfgang Meiners Guenter Fritz |
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Institution: | Lehrstuhl für Analytische Chemie, Chemisches Laboratorium der Universität Freiburg i.Br. Federal Republic of Germany |
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Abstract: | The iodine—azide reaction catalyzed by sulphur-containing compounds is followed simultaneously by optical and thermometric measurements in closed and flowing systems. In the closed system, thiosulphate can be determined in the range 32.4–324 μg ml-1, by observing the turbidity caused by the nitrogen formed during the reaction and the temperature changes. With the flow apparatus, thiosulphate can be determined in the range 112–1120 μg ml-1 by continuously mixing the sample and reagent solutions. H2S in nitrogen 5–100 ppm) is measured by sweeping the gas into the reaction Cuvette. In a third flow procedure, H2S is liberated continuously from sodium sulphide solutions (0.1–10 μg S2- ml-1) by ascorbic acid, and swept to the measuring cuvette with nitrogen. |
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