The concentration of Eu(III) cations in model aqueous solutions can be quantified by means of Arsenazo III reagent. Absorbance of the solution was measured at the wavelength λmax = 655 nm. Molar absorptivity reached the value ε655 = 5.5±0.2 · 104 cm-1 mol-1 · dm3. Beer's law was obeyed in the range from 0 to 2 mg · dm-3 Eu(III). The value of limit of detection was established by application of 3σ approach and reached the value of 20.9 μg · dm-3. Repeatability of analysis expressed by relative standard deviation does not exceed the value of ± 8% and apparent recovery lay in acceptable range from 91 to 106 %. Stoichiometry between Eu(III) and Arsenazo III in media of relevant solution was 1:1. The absorbance of the solutions within the linear range of the proposed method maintained a constant value for 60 minutes. Described procedure can be utilized to determination of Eu(III) concentration in real samples, but it is necessary eliminate interfering ions. Cations like La(III), Sm(III), Th(IV), U(VI) and complexing agent EDTA cause significant error at the determination of Eu(III) in model solution. Presented spectrophotometric method could be applied for the determination of europium in the minerals and water samples, however after a suitable separation and preconcentration of target analyte.
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BASARGIN, N. N., IVANOV, V. M., KUZNETSOV, V. V., MIKHAILOVA, A. V.: 40 years since the discovery of the Arsenazo III reagent. J. Anal. Chem., 55, 2000, 204-210.
BLAZEJAK-DITGES, D.: Über die photometrische Bestimmung des Cergehaltes legierter Stähle. Z. Anal. Chem., 251, 1970, 11-15.
DASKALOVA, N., VELICHKOV, S., SLAVOVA, P.: Spectral interferences in the determination of traces of scandium, yttrium and rare earth elements in “pure” rare earth matrices by inductively coupled plasma atomic emission spectrometry Part III. Europium. Spectrochim. Acta, 51B, 1996, 733-768.
FANG, G. Z., PAN, J. M., ZHOU, W. L., XU, B. L.: Study on the Spectrophotometric Determination of Rare Earths with a New Chromogenic Reagent Dibromo-pmethyl- chlorosulfonazo (DBMCSA). Chinese Chem. Lett., 10, 1999, 851-854.
FU, X. T., WANG, C. M., ZHANG, Y. S.: Polarographic study of the Eu(III)- triethylenetetraaminehexaacetic acid complex and determination of europium by oscillopolarography. Anal. Chim. Acta, 272, 1993, 221-225.
HEISERMAN, D. L.: Exploring Chemical Elements and Their Compounds, McGraw- Hill, New York, 1992, 371 pp.
MLAKAR, M., BRANICA, M.: Voltammetric study of europium(III) in the presence of 2-thenoyltrifluoroacetone. Anal. Chim. Acta, 247, 1991, 89-95.
POLUEKTOV, N. S., KIRILOV, A. I., MAKARENKO, O. P., VLASOV, N. A.: Determination of total rare earth content in natural waters by extraction - spectrophotometric method (English translation). Zavod. Lab., 37, 1971, 536-537.
ROHWER, H., HOSTEN, E.: pH dependence of the reactions of arsenazo III with the lanthanides. Anal. Chim. Acta. 339, 1997, 271-277.
SAVVIN, S. B.: Analytical use of Arsenazo III. Determination of thorium, zirconium, uranium and rare earth elements. Talanta, 8, 1961, 673-685.
SAVVIN, S. B.: Analytical applications of Arsenazo III-II* Determination of thorium, uranium, protactinium, neptunium, hafnium and scandium. Talanta, 11, 1964, 1-6.
STOYANOV, A., CHIVIREVA, N. A., STOYANOVA, I. V., TIMUKHIN, E. V., ANTONOVICH, V. P.: Indirect photometric determination of europium(II) in some inorganic materials containing aliovalent europium species. J. Anal. Chem., 66, 2011, 470-475.
STRELOW, F. W. E.: Quantitative separation of lanthanides and scandium from barium, strontium and other elements by cation-exchange chromatography in nitric acid. Anal. Chim. Acta. 120, 1980, 249-254.
TAKATATSU, T., SATO, A.: Spectrofluorimetric determination of europium and samarium with mixtures of 2-thenoyltrifluoroacetone and tri-n-octylphosphine oxide in aqueous solutions containing triton x-100. Anal. Chim. Acta, 108, 1979, 429-432.
VAN LOCO, J., ELSKENS, M., CROUX, CH., BEERNAERT, H.: Linearity of calibration curves: use and misuse of the correlation coefficient. Accredit. Qual.Assur., 7, 2002, 281-285.
YAMADA, S., KANO, K., OGAWA, T.: Time discrimination in the laser fluorimetry and ultratrace determination of europium(III) and samarium(III) with 4,4,4- trifluoro-1-(2-thienyl)-1,3-butanedione. Anal. Chim. Acta, 134, 1982, 21-29.
ZANG, S., MURACHI, S., IMASAK, T., WATAABE, M.: Determination of rare earth impurities in ultrapure europium oxide by inductively-coupled plasma mass spectrometry. Anal. Chim. Acta, 314, 1995, 193-201