Abstract: The calibration method was developed for the matrix effects and polyatomic ion of the analysis of rare earth elements in the geological samples. Matrix effects were minimized by using synthetic calibration solutions which simulated the composition of natural rocks by statistically calculating the average values of 20 geological samples and normalization. Two separate internal standards of ¹¹⁵In-¹⁰³Rh were selected to compensate the drift of analytical signals. Polyatomic ions were calibrated by measuring the oxides (MO⁺) and hydroxide (MOH⁺) with individual La, Ce, Pr and Ba solution for the ratio of MO⁺/M⁺ and MOH⁺/M⁺ and calculating equivalently concentrations. The proposed method has been applied to the analysis of AGV-1(Andesite), BHVO₂^-(Basalt), GSR-3(Basalt), DNC-1(dolerite) and RGM-1(rhyolite). The relative error between this work and the recommend values are better than 10% and the relative standard deviations are better than 5%.

Key words: Matrix effects, Polyatomic ion, Rare earth elements, ICP-MS