Use of flow injection analysis based on iodometry for automation of dissolved oxygen (Winkler method) and chemical oxygen demand (dichromate method) determinations |
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| Authors: | M Novi? B Pihlar and M Dular |
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| Institution: | (1) Boris Kidri Institute of Chemistry, Ljubljana, Yugoslavia;(2) Faculty of Nature Science and Technology, Department of Chemistry, Edvard Kardelj University, Ljubljana, Yugoslavia |
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| Abstract: | Summary Two analytical methods for water analysis were miniaturized and partly automated by the flow injection analytical approach. In the standard Winkler method for dissolved oxygen determination, the final step, the titration of liberated iodine with Na2S2O3, was replaced by amperometric detection in a flowing stream. The concentration of dissolved oxygen was determined by the standard addition method using KIO3 as a standard reagent. The dichromate method for chemical oxygen demand determinations was also miniaturized. Oxidation of organic substances by K2Cr2O7 in H2SO4 (1+1) medium was carried out under standard conditions and the excess of dichromate ions was determined electrochemically via measurement of released I2 after addition of KI in a continuous stream. The chemical oxygen demand of a sample was calculated on the basis of the current without standard addition.
Anwendung der iodometrischen Fließinjektionsanalyse zur Automation der Bestimmung von gelöstem Sauerstoff (Winkler-Methode) und chemischem Sauerstoffbedarf (Dichromat-Methode) |
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