Abstract
Traces of lanthanides can be effectively separated from other lanthanides in major concentrations and other elements by liquid chromatography on a column of Separon SGX C18 silica gel modified by sorption of ammonium dodecylsulphate or ammonium octanesulphonate and determined spectrophotometrically with Arsenazo III. Isocratic or stepwise acidity gradient elution with 90 mmol/l of ammonium 2-hydroxy-2-methylpropionate (HIBA) or 60 mmol/l of ammonium citrate was used. Interferences by the elements up to 103–104 concentration ratio can be eliminated. Lanthanides at mg/g level can be determined in cerium oxide with a relative standard deviation sr<2.5% (n=5).
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