Microdetermination of iodine in carrier-free131I solutions |
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| Authors: | H Kurcbart S Quiroga R A Caro R Radicella |
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| Institution: | (1) Department of Radioisotopes, Comisión Nacional de Energía Atómica, Buenos Aires, (Argentina);(2) Cátedra de Física, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, (Argentina);(3) Present address: Comisión Nacional de Energía Atómica, Buenos Aires, Argentina |
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| Abstract: | A photocolorimetric microtechnique is described, by which it is possible to determine the real amount of iodine in carrier-free
solutions of131INa. The method is conceptually based on the well-known effect of iodine, by which the rate of reduction of ceric sulfate
by arsenious acid in sulfuric acid solutions is proportional to the iodide concentration. The tittration and the preparation
of its corresponding calibration graph require approximately 90 min; thus, it seems possible to use this technique as a routine
analysis. Under the stated conditions of temperature and reaction time, it is possible to determine samples of iodine with
concentrations ranging between 20 and 160 ng/ml. The standard error between different determinations is less than ±5%. The
application of the method in production control and utilization of carrier-free131I solutions, free from reducing agent, are discussed. |
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