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Time-resolved laser fluorescence spectroscopy of organic ligands by europium: Fluorescence quenching and lifetime properties

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Academic year: 2021

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Table 1: Stability constants and average fluorescence lifetimes of SA and HSs complexed with Eu 3+
Figure 1: Components obtained for A) Salicylic acid–Eu 3+ B) Humic acid–Eu 3+ and C) Fulvic acid–Eu 3+ interaction after CP/PARAFAC decomposition
Figure 2: Variation of the CP/PARAFAC components contributions to the EEMs of A) Salicylic acid B) Humic acid and C) Fulvic acid as a function of Eu 3+ concentration
Figure 3: Stern–Volmer plot showing the intensities ratio and the fluorescence lifetimes ratio of A) Salicylic acid-Eu 3+ , B) Humic acid-Eu 3+ and C) Fulvic acid–Eu 3+ interactions

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