The Determination of the Rare Earth Elements in Rocks by Spark Source Mass Spectrometry

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Abstract
The determination of the rare earth elements in rocks by high frequency spark source mass spectrometry, using photoplate detection, was investigated.Several standard rocks (BCR‐1, JB‐1, JG‐1, NIM‐G, NIM‐N) were analysed by the “direct” method, and after three different selected enrichment procedures: peroxide fusion and successive hydroxide and fluoride precipitations; acid digestion and cation exchange chromatography; acid digestion and mixed‐solvent anion exchange chromatography. These preconcentration methods are discussed and the results obtained are compared with each other.A mixed‐solvent anion exchange procedure permits to determine all rare earth elements with a precision of 10%.