Siberian Federal University

The possibility of 33 trace elements determination in silicate rocks after fusion with lithium metaborate was studied on a SUPEC 7000 mass spectrometer (FPI, China) using a collision cell (gas – He) with kinetic energy discrimination (KED) and without cell. For the study, we used reference materials – BHVO‑2, BCR‑2, G‑2, BIL‑1, SGD‑2A, ST‑2A with known contents of the studied elements and natural samples of different compositions, analyzed by a mass spectrometer ELEMENT with a magnetic sector. A procedure has been developed for measuring the concentrations of trace elements in a solution with a complex matrix composition after fusion using external calibration in combination with an internal standard, ensuring the minimization of spectral and non‑spectral matrix influence. The determination of analytes from Rb to U was performed without a collision cell, using, where necessary, mathematical correction of the concentrations of some rare earth elements. To determine analytes with the most significant spectral interferences, the efficiency of using a collision cell with KED was assessed and a mode was selected for simultaneously eliminating or reducing spectral interference during measurement. It was found that the use of collision mode with KED (He flow – 2.15 ml/min) allowed to reduce the detection limits of analytes, especially Sc, several times, compared to the standard measurement mode on SUPEC 7000. Precision and accuracy for all trace elements are estimated to be 5–10 %. The correctness of the obtained results based on the developed approach is confirmed by comparison with certified concentration values in reference materials