Croatica Chemica Acta, Vol. 72 No. 4, 1999.
Izvorni znanstveni članak
Figures of Merit and Fundamental Processes in the Analysis of Ca from Liquid Samples Using an r.f. CCP Torch with Tubular and Ring Electrodes
Tiberiu Frentiu
; Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, Department of Analytical Chemistry, 3400 Cluj-Napoca, Arany Janos 11, Romania
Sorin D. Anghel
; Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu 1, 3400 Cluj-Napoca, Romania
Marius Nicola
; Research Institute for Analytical Instrumentation, Donath 67, 3400 Cluj-Napoca, Romania
Eugen Darvasi
; Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, Department of Analytical Chemistry, 3400 Cluj-Napoca, Arany Janos 11, Romania
Alpar Simon
; Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu 1, 3400 Cluj-Napoca, Romania
Emil Cordos
; Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, Department of Analytical Chemistry, 3400 Cluj-Napoca, Arany Janos 11, Romania
Sažetak
A radiofrequency capacitively coupled Ar plasma, obtained with a molybdenum tubular electrode placed inside a quartz tube and one or two copper ring electrodes placed outside the tube, was used as spectral source for determination of atoms, ions and molecular radicals of calcium. A simultaneous spectrometer equipped with a photodiode array was used for detection of emission spectra. The atomization and ionization processes of Ca species were studied in the presence and absence of NaCl and H3PO4 matrix, with both single ring and two rings electrode torches. The limits of detection are 250 ng mL–1 for CaII 393 nm, 100 ng mL–1 for CaI 423 nm, 230 and 100 ng mL–1 for CaOH 555 nm and 622 nm. The recovery degree for certified plasma serum samples was 99.4 ± 4.4% and the RSD was between 3.8–4.9%. For 5 blood samples the RSD of Ca content is 2.9–4.4%.
Ključne riječi
atomic emission spectrometry; capacitively coupled plasma; Ca determination; blood analysis
Hrčak ID:
132297
URI
Datum izdavanja:
1.12.1999.
Posjeta: 851 *