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The analysis for dissolved oxygen in water from small volume systems has required some modification of the standard method. These changes consist mainly of an alteration in the method of obtaining a sample and a more sensitive means for determining the released iodine.
"A continuous flow method for the determination of dissolved oxygen in fresh water samples is described. The method is suitable for the analysis of large number of samples as well as for continuous monitoring. It utilizes Flow-Injection principle with in-line Winkler chemistry and spectrophotometric detection. Up to 120 samples/hour can be analysed with relative standard deviation of ca 2% and the detection limit of 0.1 ppm. The turbidity and colour of the samples do not interfere with the measurement. The operation of the system including calibration, calculation and statistical evaluation as well as data storage in main frame computer is governed by a PC work station"--Abstract.
The need and importance of dissolved oxygen measurements; Thermodynamic aspects of dissolved oxygen; Principles of voltammetry; Membrane-covered polarographic detectors-introduction and theory; Membrane-covered polarographic detectors - practical considerations; Membrane-covered polarographic detectors-nonsteady-state measurements; Other methods of measurement non electrochemical.