Artículo
Simultaneous spectrophotometric determination of La, Ho, Mn 5-Br-PADAP complexes using multivariate calibration with partial least-squares (PLS) data evaluation
Fecha de publicación:
12/2000
Editorial:
Springer Verlag Berlín
Revista:
Fresenius Journal Of Analytical Chemistry
ISSN:
0937-0633
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A simple and fast analytical pocedure is proposed for the simultaneous spectrophotometric determination of lanthanum, holmium and manganese in synthetic ceramics, (La(0.8-x) Hox Sr0.2 MnO3), by using the partial least-squares (PLS) method. As chromogenic agent 5-Br-PADAP [2-(5 -bromo-2-pyridylazo)-5 -diethylaminophenol] was used, which form colored complexes with the three elements studied. To avoid metal hydrolysis, a mixture of ethanol and Triton X-100 at pH 9.5 was used for all experiments. A set of 17 calibration solutions measured throughout the 400-700 nm wavelength range was used in the calibration step. The concentration range for Mn(II) was 1-12 × 10-6 mol L-1, while the range for the rare earth elements La(III) and Ho(III) was 2-8 × 10-6 mol L-1. In order to demonstrate the applicability of the proposed method, a set of artificial samples containing the three analytes in variable proportions was prepared and analyzed. The analytical results obtained were quite acceptable with relative errors not greater than 7% in most cases.
Palabras clave:
MULTIVARIATE
,
CALIBRATION
,
RARE EARTHS
,
SPECTROPHOTOMETRIC
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(INQUISAL)
Articulos de INST. DE QUIMICA DE SAN LUIS
Articulos de INST. DE QUIMICA DE SAN LUIS
Citación
Ferreyra, Raquel Edith; Camiña, José Manuel; Marchevsky, Eduardo Jorge; Luco, Juan Maria; Simultaneous spectrophotometric determination of La, Ho, Mn 5-Br-PADAP complexes using multivariate calibration with partial least-squares (PLS) data evaluation; Springer Verlag Berlín; Fresenius Journal Of Analytical Chemistry; 368; 6; 12-2000; 595-600
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