Abstract
The suitability of some developing solvent mixtures has been investigated for the paper-chromatographic separation of the anions fluoride, sulphate, phosphate, oxalate, citrate, selenate and molybdate, which form complexes with metals like thorium, zirconium etc. The solvent mixture acetone-ethanol-n-butanol-water-ammonia (40∶20∶10∶30∶2) proved effective in the separation of fluoride, sulphate, phosphate and selenate from a mixture. The blue thorium chelate of the dye β-SNADNS-6 has been used as a chromogenic spray for the detection of the anions on the paper, prominent pink spots appearing on a blue back ground. As little as 2 μg of fluoride, 10 μg of sulphate and phosphate, 15 μg oxalate and 25 μg of citrate, selenate and molybdate can be detected.
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