ANALYTICAL ASPECTS OF SOME ORGANIC COMPOUNDS. PART VI. 2-HYDROXY-3-NAPEITHOIC ACIDS IN THE DETERMINATION OF THORIUM AND ZIRCONIUM

2-Hydroxy-3-naphthoic acid and its acetyl, bromo, iodo, nitro and nitroso derivatives have been used for the gravimetric determination of thorium and zirconium. Separation of thorium from the cerite earths and of thorium and zirconium from a number of foreign ions have been carried out with the bromo, iodo, nitro and nitroso compounds. They may also be used for the extraction of thorium from monazite sands. A considerable amount of zirconium may be separated from a smaller quantity of thorium when present in a mixture. Separation of thorium from uranium with the bromo, iodo and nitro compounds have also been described