Magnesium ammonium nitrate oxalate

Praseodymium is difficult to obtain in pure compounds buffi because of its scarcity and close resemblance to other elements. The best methods of separation are as follows (1) Hot. out from a double magnesium nitrate scries such fractions us contain only lanthanum and praseodymium continue the fractionation of the same salt or of double ammonium nitrate, Praseodymium appears at the soluble end, but usually neodymium appears there also, even if its presence is unsuNficctcd at first. (2) Remove from the magnesium double nitrate series the fractions which contain only praseodymium and neodymium and continue the fractionation as the manganese double nitrate, when praseodymium separates in the least soluble portions, Other methods used are Crystallization of the oxalates from nitric add of the double ammonium nitrate or double carbonate. 

Ammonium dichromate Ammonium molybdate Ammonium nitrate Ammonium sulfate Barium carbonate Barium chloride Barium nitrate Borax Boric acid Caldum oxide Chromium trioxide Citric acid Potassium thiocyanate Sodium acetate Sodium aluminum fluoride Sodium bicarbonate Sodium chlorate Sodium chloride Sodium nitrate Sodium sulfate Triphenyl phosphate Ammonium chloride Ammonium fluoride Copper sulfate Magnesium chloride Oxalic acid Aluminum chloride Calcium chloride Ferric chloride Potassium permanganate Sodium carbonate Sodium fluoride... 

Silica gel plates are modified to form a reversed-phase sorbent by being impregnated with liquid paraffin, silicone oil, or fats. Reversed-phase plates of this type are used in the identification of steroid hormones [8,9]. Table 3.2 lists various other substances that have been used for impregnation [10,11]. Sorbents that are impregnated with amminium oxalate, ammonium sulfate, magnesium acetate, sodium acetate, and silver nitrate have one time or the other been commerically available. As an example, impregnated adsorbents have been used for the resolution of sulfa drugs [19]. 

Salts Compounds formed by the union of acids and bases, by the action of alkalies upon metals, or by the direct union of elements. The term is often incorporated in the common name of salts used as pharmaceuticals bitter salts, epsom salt, or Seidlitz salt (magnesium sulfate), preparing salt (sodium stannate), Preston s salts (ammonium chloride), Rochelle salt or Seignette s salt (potassium and ammonium tartrate), salt of Mars (ferrous sulfate), salt of Saturn (lead acetate), salt of tartar (potassium carbonate), salt of tin (stannous chloride), salt of wisdom (mercury bichloride and ammonium chloride), sore-throat salt (fused potassium nitrate), vinegar salts (calcium acetate), and vomiting salt (zinc sulfate). The term is also applied to some acids, such as salt of lemon or sour salt (citric acid), salt of sorrel (oxalic acid), and spirit of salt (muriatic acid). ... 

Separation of the light lanthanides, after removal of the Ce, has been accomplished in many ways, based mainly on solubility differences fractional crystallisation of the double magnesium nitrates, 2Ln (N03)3.3Mg(N03)2.24 H2O, was an early method (James, 1908). Tlie heavy lanthanides from the double sulphate solution (above) and from ores such as xenotime have been separated by fractional crystallisation of the bromates (James, 1908). Prandtl (1938) used double ammonium oxalates. Hartley (1952) obtained a 85% yield of mixed anhydrous lanthanide chlorides by direct chlorination of a mixture of monazite and carbon at 900" most of the impurities are more volatile. 

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