Abstract
The Mn/Fe ratio, which serves as a marker of the content of rare earth elements and the platinum group elements in ferromanganese nodules, was determined in samples taken during expeditions to the Kara Sea and the Laptev Sea, as well as in a set of certified reference materials (ОOPE 601—604). The analysis was carried out by calibration-free laser-induced breakdown spectroscopy, based on the use of plasma parameters and intensities of analytical lines of manganese and iron (Mn I 542.04 nm and Fe I 539.71 nm). Boltzmann plot was used to determine the plasma temperature and Stark broadening of Fe I line 538.34 nm was used to determine electron density. We have shown the possibility of determining the Mn/Fe ratio in range
 from 0.2 to 4.2 in ferromanganese nodules of various geographic origin. A high coefficient of linear determination (R2 = 0.938) and proportionality between the results of calibration-free laser-induced breakdown spectroscopy and inductively coupled plasma atomic emission spectrometry (1:0.99) were achieved.
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