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The complexation of salicylate with Eu 3+ was studied by means of time-resolved laser-induced fluorescence spectroscopy (TRLFS) using ultra-short pulses at a concentration of sodium salicylate of 1.00 × 10 −4 M. Ionic media was kept constant at 0.1M NaClO 4 . pH was adjusted to 4.00. The concentration of Eu 3+ was varied from 1.98 × 10 −3 M to 1.31 × 10 −2 M.From the fluorescence lifetime analysis of the salicylate, we confirmed that a dynamic quenching process did not take place, while static quenching proceeded under the experimental conditions. The Stern Volmer plots indicated only the formation of a 1 : 1 complex, and the stability constant was assigned to be log β 1,1 = 2.08 ± 0.02. This agrees with reported values, which have been determined by other techniques. This result shows that the studies on complex formation can be safely investigated quantitatively by means of TRLFS from not only the luminescence of Eu 3+ but the fluorescence of salicylate.

Laser-induced breakdown spectroscopy / Europium / Eu 2 O 3 suspension / Precipitation / SorptionSummary. The generation of Eu(III) precipitation and the Eu sorption on TiO 2 particles in aqueous solution were studied using laser-induced breakdown spectroscopy (LIBS). The plasma emission intensity vs. the Eu concentration plot showed a good linearity in the concentration range of 6.6 × 10 −3 M − 1.3 × 10 −2 M for Eu aqueous solution at pH 1.1 and 6.6 × 10 −5 M − 6.6 × 10 −4 M for Eu 2 O 3 suspension at pH 5.0. It was found that the generation of Eu precipitation was detected through a drastic increase of plasma emission intensity of Eu. The results suggested that LIBS is useful for analyzing the particles and the precipitation of Eu in aqueous solution, even if the Eu ion concentration is higher by orders of magnitude. Furthermore, we could measure the plasma emission of Eu ions sorbed on TiO 2 particles under the conditions where the plasma emission of Eu ions could not be detected in the absence of TiO 2 . Hence, LIBS technique is considered to be useful to study the colloid generation of Eu.

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Laser‐induced breakdown spectroscopy (LIBS) has been developed as a rapid and easy in situ technique for the analysis of inorganic elements. Qualitative and quantitative determinations of an inorganic element can be achieved by analyzing the wavelength and intensity of the light emitted from the excited atoms arising from breakdown phenomena. Because the energy threshold of breakdown phenomena increases in the order of solid