Alkaline iodine as an oxidant for thallium (I)

Summary The use of alkaline iodine for the determination of Tl^I has been described. The hypoiodite oxidises Tl^I to Tl^III and the excess oxidant is converted into iodide and iodate which on acidification liberates quantitatively the unreacted iodine. The difference in the initial and back titre value of thiosulphate serves for the direct calculation of the thallium content. The results show a good agreement with the data obtained by a parallel gravimetric and iodometric determination of Tl^III.Sincere thanks of the author are due to Professor S. S. Joshi for kind interest in the work. The award of the Senior Research Fellowship of the National Institute of Sciences of India is also gratefully acknowledged.