Optimisation of a catalytic procedure for the determination of total iodine in seawater |
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| Authors: | Victor W Truesdale Piers Chapman |
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| Institution: | 1. Institute of Hydrology, Maclean Building, Wallingford Great Britain;2. School of Environmental Sciences, University of East Anglia, Norwich Great Britain |
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| Abstract: | A precise method for the determination of total iodine in seawater, which uses a Technicon Auto-Analyser II system and is based on Truesdale and Spencer's (1974) and Truesdale and Smith's (1975) earlier works with a catalytic procedure, is described. The procedure operates over a range of 30–80 μg1?1 of iodine. As requested by Mark (1973), the way in which the procedure can be varied to suit other applications, and therefore ranges, is explained in detail. The standard deviation at the 50 μg1?1 level was found to be 0.12 μ1?1 showing that the method's precision exceeds most, if not all, previously published procedures for this variable. This high degree of resolution makes the procedure suitable for oceanic investigations. The effects of varying the reaction time, the temperature at which the reaction proceeds and the salinity of samples and standards are described. The advantages of using a Technicon Auto-Analyser II system rather than an Auto-Analyser I system are discussed. With slight modification the procedure can also be used in the measurement of river flow where sodium iodide is used as tracer in the dilution method. |
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