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- [42] ANALYTICAL ASPECTS OF SOME AZO DYES FROM CHROMOTROPIC ACID .4. SPECTROPHOTOMETRIC DETERMINATION OF THORIUM WITH 2-7-DI-(4-SULPHONAPHTHYL AZO)-1,8-DIHYDROXY NAPHTHALENE-3,6-DISULHONIC ACID (DI-SNADNS) FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1956, 150 (05): : 347 - 355