%A"Fernandez R, E [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]" %D2008 %I; Universidad Autonoma del Estado de Mexico, Facultad de Ciencias, 50000 Toluca, Estado de Mexico (Mexico) %2 %J[] %K37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY, ALGORITHMS, DISTRIBUTION FUNCTIONS, ERBIUM CHLORIDES, EUROPIUM CHLORIDES, EXPERIMENTAL DATA, GAMMA SPECTRA, HYDROLYSIS, ION EXCHANGE, LANTHANUM CHLORIDES, LUTETIUM CHLORIDES, M CODES, PRASEODYMIUM CHLORIDES, RADIOCHEMISTRY, SOLVENT EXTRACTION, SPECTROPHOTOMETRY, STABILITY, VALENCE %PMedium: ED; Size: 153 pages %TDetermination of the stability constants of lanthanum, praseodymium, europium, erbium and lutetium complexes with chloride ions; Determinacion de las constantes de estabilidad de los complejos de lantano, praseodimio, europio, erbio y lutecio con iones cloruro %XThe stability constants of La{sup 3+}, Pr{sup 3+}, Eu{sup 3+}, Er{sup 3+} and Lu{sup 3+} chloride complexes were determined in perchloric acid media using a liquid-liquid extraction method. The dinonyl napthalene sulfonic acid in n-heptane was used as extractant. The lanthanide (Ln) concentrations were measured by a radiochemical (Eu and Lu) and a spectrophotometric (La, Pr, and Er) methods. In the last method, xylenol orange was used for the determinations at ph 6. The stability constants of lanthanum, praseodymium, erbium and lutetium chloride complexes were determined in 2, 3 and 4 M ionic strength and europium in 1, 2 and 3 M, at 303 K. The fitting of experimental data to the equations for the calculation of the stability constants, was carry out considering both one chemical species (LnCl{sup 2+}) or two chemical species (LnCl{sup 2+} and LnCl{sub 2}{sup +}). The Specific Ion Interaction Theory was applied to the values of log {beta}{sup I}{sub Ln},{sub Cl} and the first stability constants at zero ionic strength were calculated by extrapolation. The same theory could not be applied to the log {beta}{sup I}{sub Ln},{sub 2Cl}, due to its low abundance and the values determined for the stability constants were similar. The distribution diagrams of the chemical species were obtained using the program MEDUSA and considering log {beta}{sup I}{sub Ln},{sub CI}, log {beta}{sup I}{sub Ln},{sub 2CI} values obtained in this work and the hydrolysis constants taken from the literature. The lanthanide chloride complexes are present in solution at specific conditions of ionic strength, concentration and in the absence of hydrolysis. The log {beta}{sup I}{sub Ln},{sub Cl} data were related to the charge density and the corresponding equations were obtained. These equations could be used to determine the stability constants along the lanthanide series. (Author) %0Thesis/Dissertation %NINIS-MX-2543;TRN: MX0900081086426 %1 %CMexico %Rhttps://doi.org/ TRN: MX0900081086426 MXN %GSpanish