Thorium complex of 2,7-dinitroso-1,8- dihydroxynaphthalene-3,6-disulphonic acid : Complexometric determination of thorium with ethylenediaminetetraacetic acid
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AbstractThorium forms a pinkish-violet coloured complex with dinitrosochromotropic acid, which has been used as an indicator in the titrimetric determination of thorium with EDTA. The method is based on the fact that this coloured complex is less stable than the thorium-EDTA complex and breaks down after a bulk of thorium has reacted with EDTA; this marks the end-point, which is the change from pinkish-violet to red. am little as 3.1 mg of thorium present in 50 ml volume of solution may be accurately determined within a pH range from 2.2 to 3.5. The study of interferences revealed that quite a number of elements do not interfere; iron may be masked with ascorbic acid. Thorium may be determined by the same method, after separating it from many interfering ions by precipitating it with o-anisilic acid.

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