ИСТИНА

LIBS and XRF are mutually complementary in terms of analytical potential, including typical analytes and options for local or bulk analysis. We compared their performance for the determination of inorganic pollutants in biosamples, namely, fish, zooplankton, and aquatic plants. These samples present a number of matrices of highly variable chemical composition (from fish bones to plant stems). For LIBS, different plasma zones were considered, showing different degrees of self-absorption of spectral lines. Some spectral lines are only detectable when a specific zone is selected, like the Fe I 278.810 line in zooplankton (Fig. 1). This information was used to improve the calibration graphs. The study was funded by RFBR and BRFFR, projects No. 20-53-04036 and Б21РМ-085, respectively.