The present study describes the development of an analytical method for the
determination of cesium in biological fluid samples (human urine and blood samples)
by laser-induced breakdown spectroscopy (LIBS). The developed method is based on
sample presentation by liquid-to-solid conversion, enhancing the emission signal by
drying the liquid into small “pockets” created in a metal support (zinc plate), and
allows the analysis to be carried out on as little as 1 μL of sample volume, in a
closed sample cell. Absolute detection limits on the Cs I 852.1 nm spectral line
were calculated by the IUPAC 3σ method to be 6 ng in the urine sample and 27 ng in
the blood serum sample. It is estimated that LIBS may be used to detect highly
elevated concentration levels of Cs in fluid samples taken from people potentially
exposed to surges of Cs from non-natural sources.
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