Mathematical elimination of spectral interferences at direct determination of rare earth elements in natural waters by inductively coupled plasma quadrupole mass spectrometry

T12N2

E.V. Elovskiy

The paper gives original mathematical elimination models of oxide and hydroxide spectral interferences on analytical masses of rare earth elements for the quadrupole instrument in the mode oriented on the introduction of low-mineralized samples without the use of collision gas helium. Single model to eliminate spectral interferences with elements from La to Dy in the composition, as well as three models to eliminate spectral interferences with Ba in the composition were presented. A comparison of the efficiencies of the last three proposed models between themselves and with the previously used and described in the literature approach was given. Relative intensities of the oxide and hydroxide ions of elements from Ba to Dy were shown. For six river water samples from Primorye Territory (Russia) concentration of Ba and rare earth elements were obtained. They can be used for the correct interpretation of hydrogeochemical behavior of elements (especially Eu, Gd, and Tb). A method for calculating the integration time was presented.

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