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Inductively coupled argon plasma/optlcal emission spectrometery (ICAP/OES) Is useful as a simultaneous, multielement analytical technique for the determination of trace elements In geological materials. A method for the determination of trace-level rare earth elements (REE) In geological materials using an ICAP 63-channel emission spectrometer is described. Separation and preconcentration of the REE and yttrium from a sample digest are achieved by a nitric acid gradient cation exchange and hydrochloric acid anion exchange. Precision of 1-4% relative standard deviation and comparable accuracy are demonstrated by the triplicate analysis of three splits of BCR-1 and BHVO-1. Analyses of other geological materials Including coals, soils, and rocks show comparable precision and accuracy.

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