Determination of trace europium based on new fluorimetric system of europium(III) with thenoyltrifluoroacetone and N, N′-dinaphthyl- N, N′-diphenyl-3,6-dioxaoctanediamide

• Published in: Talanta (Oxford) 1998-08, Vol.46 (4), p.527-532
• Main Authors: Yang, Wu, Teng, Xiu-lan, Chen, Miao, Gao, Jin-zhang, Yuan, Li, Kang, Jing-wan, Ou, Qing-yu, Liu, Shi-xia
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Chemistry; Europium determination; Exact sciences and technology; Fluorimetry; N, N′-dinaphthyl- N, N′-diphenyl-3,6-dioxaocanediamide; Spectrometric and optical methods; Thenoyltrifluoroacetone
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/S0039-9140(97)00300-7

In the present paper, N, N′-dinaphthyl- N, N′-diphenyl-3,6-dioxaoctanediamide acts as a specific reagent for enhancing the fluorescence intensity of Eu(III) complex with thenoyl trifluoroacetone (TTA), the spectrofluorimetric determination of trace amounts of Eu(III) based on the above system was carried out and its luminescence mechanism was studied. The excitation and emission wavelengths are 343.6 and 613.3 nm, respectively. The fluorescence intensities vary linearly with the concentration of europium(III) in the range 3.647×10 −3–3.039 μg ml −1 for the original fluorescence with a detection limit down to 2.279×10 −4 μg ml −1 and the standard deviation is 0.063 μg ml −1 for 10 times measurements, and in the range 7.598×10 −4–0.0243 μg ml −1 (SD=0.035 for 15 times measurements), 0.06078–0.6100 μg ml −1 (SD=0.52 for 10 times measurements) for the first derivative fluorescence signal with a detection limit down to 8.566×10 −5 μg ml −1. The interferences of other rare earths and some of inorganic ions are described. This method is a direct, rapid, selective and sensitive analytical method for the determination of trivalent europium in rare earth ore samples and high purity of rare earth oxides.