A spectrophotometric method of analysis for technetium(VII) has been developed to supplement the radiochemical and polarographic methods that are now used in laboratories of radiochemical processing plants. Technetium is determined as the pertechnetate ion in the concentration range from 2 to 40 µg. per ml. in the final solution by measuring at 655 µ the intensity of the color that is formed at pH 8.0 with thioglycolic acid. Beer's law is obeyed over this range. The molar absorptivity is estimated to be of the order of 1 800. Few anions interfere. The time required for the determination is short, and the technique is simple. The production of appreciable quantities of technetium in radiochemical processing plants has aroused interest in the development of a spectrophotometric method of analysis that could be used to supplement the radiochemical and polarographic methods
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