A method has been developed for the determination of plutonium over the range 5 to 100 µg with an accuracy of ±1% at the 100µg level. The coloured complex between tetravalent plutonium and the commercial reagent Thoronol [1 - o - arsenophenyl azo) - 2 napththol - 3 - 6 - disulphonic acid] is measured on a Spekker Absorptiometer. This can be used to estimate the amounts of the three, four and six valent states present in a plutonium sample. The thoronol complexes formed with ferric and uranyl ions have been examined at different acidities. Methods are suggested to remove or to minimise the effects due to most of the complexing cations such as iron or anions such as fluoride.
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