ANALYTICAL ASPECTS OF SOME ORGANIC COMPOUNDS. PART V. 2-HYDROXY-3-NAPHTHOIC ACIDS : DETERMINATION OF COBALT

Analytical properties of 2-hydroxy-3-naphthoic acid and its nitro, bromo, iodo, acetyl and nitroso derivatives have been studied. Thorium and zirconium form more or less quantitative precipitates with all these acids. The nitro derivative affords almost a quantitative precipitate with titanium as well. The nitroso derivative could be used for the determination of cobalt, palladium and uranium in addition to thorium. The gravimetric determination of cobalt and its separation from nickel and ether elements with the nitroso derivative have been described