Artículos de revistas
Use of the internal standardization for difficult sampling by graphite furnace atomic absorption spectrometry
Fecha
2004-10-08Registro en:
Talanta, v. 64, n. 2, p. 334-337, 2004.
0039-9140
10.1016/j.talanta.2004.02.032
WOS:000223778300010
2-s2.0-4143061707
8708735699846578
Autor
Universidade Estadual Paulista (Unesp)
Universidade Federal de São Carlos (UFSCar)
Universidade de São Paulo (USP)
Institución
Resumen
This work shows the potentiality of As as internal standard to compensate errors from sampling of sparkling drinking water samples in the determination of selenium by graphite furnace atomic absorption spectrometry. The mixture Pd(NO 3) 2/Mg(NO 3) 2 was used as chemical modifier. All samples and reference solutions were automatically spiked with 500 μg l -1 As and 0.2% (v/v) HNO 3 by the autosampler, eliminating the need for manual dilutions. For 10 μl dispensed sample into the graphite tube, a good correlation (r=0.9996) was obtained between the ratio of analyte absorbance by the internal standard absorbance and the analyte concentrations. The relative standard deviations (R.S.D.) of measurements varied from 0.05 to 2% and from 1.9 to 5% (n=12) with and without internal standardization, respectively. The limit of detection (LD) based on integrated absorbance was 3.0 μg l -1 Se. Recoveries in the 94-109% range for Se spiked samples were obtained. Internal standardization (IS) improved the repeatability of measurements and increased the lifetime of the graphite tube in ca. 15%. © 2004 Elsevier B.V. All rights reserved.
Materias
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Use of the internal standardization for difficult sampling by graphite furnace atomic absorption spectrometry
Oliveira, Adriana P.; Gomes Neto, José Anchieta; Nóbrega, Joaquim A.; Oliveira, Pedro V. -
Use of the internal standardization for difficult sampling by graphite furnace atomic absorption spectrometry
Universidade Estadual Paulista (Unesp); Universidade Federal de São Carlos (UFSCar); Universidade de São Paulo (USP) (2004-10-08)This work shows the potentiality of As as internal standard to compensate errors from sampling of sparkling drinking water samples in the determination of selenium by graphite furnace atomic absorption spectrometry. The ... -
Determination of copper in fish feed by graphite furnace atomic absorption spectrometry using slurry sampling
Neves, Renato C.F.; Moraes, Paula M.; Silva, Fábio A.; Loureiro, Vanessa R.; Saleh, Mayra A.D.; Padilha, Cilene C.F.; Barros, Margarida Maria; Padilha, Pedro de Magalhães