ICP-OES determination of rare earth elements in silicate rocks using ultrasonic nebulization and on-line ion-exchange tron separation

摘要

Rare earth elements (REEs) were determined in geological samples by inductively coupled plasma optical emission spectrometry (ICP-OES) with online iron separation using now injection (FI) with an ultrasonic nebulization system. The anion-exchange separation method of a hydrochloric system was applied to the separation of REEs from iron. The iron-chlorocomplexes were retained on an anion-exchange (Dowex 1X-8) microcolumn (3.0 mm i.d. x 50.0 mm bed length), while the analytes were introduced into the ultrasonic nebulization system. After iron removal, a 700-muL sample was injected into a water carrier stream. The sl:stem was found to have a detection limit of La 0.30 mug/L; Ce 0.93 mug/L; Nd 0.51 mug/L; Sm 0.25 mug/L; Eu 0.045 mug/L; Gd 0.72 mug/L; Er 0.12 mug/L; Yb 0.01 mug/L; Lu 0.006 mug/L. The application of the method on Reference Materials GS-N (ANRT); AC-E (IGW), G-2, RGM-1, AGV-1 and SDC-1 (USGS) demonstrated that results were statistically indistinguishable from published values. [References: 29]