ANALYTICAL CHEMISTRY OF THORIUM PART X. AMMONIUM FUROATE (PYROMUCIATE) AND SODIUM SULPHANILATE

Two new reagents; ammonium furoate and sodium sulphanilate, have been investigated and recommended for the estimation and separation, of thorium from the rare earths. The first functions in the \(p\)H above 2.0, estimates as little as 2.2 mg. of ThO2 and frees in one precipitation thorium from fifty-fold excess of cerite earth oxides. The second functions in the \(p\)H above 2.3; estimates as, small as 1 mg. of ThO3 and frees similarly from a zoo-fold excess of cerite earth oxides. Both the re­agents have been used to estimate thorium in monazite