Artículos de revistas
Multi-energy calibration for the determination of non-metals by high-resolution continuum source molecular absorption spectrometry
Fecha
2019-05-01Registro en:
Journal of Analytical Atomic Spectrometry, v. 34, n. 5, p. 972-978, 2019.
1364-5544
0267-9477
10.1039/c9ja00006b
2-s2.0-85065543156
Autor
Universidade Estadual Paulista (Unesp)
Universidade Estadual de Maringá (UEM)
Salem Hall
Institución
Resumen
Spectra of diatomic molecules are rich in fine structures which may be used for different analytical applications in high-resolution continuum source molecular absorption spectrometry (HR-CS MAS). If several bands of a given diatomic molecule are simultaneously measured, they may be used in multi-energy calibration (MEC), a method based on the use of several wavelengths of the same absorbing/emitting entity to improve the accuracy in analytical atomic spectrometry. In this work, MEC is used for the first time as a calibration method for HR-CS MAS using flame (F) and graphite furnace (GF) atomizers. Methods were developed and applied for the determination of N, P and S in fertilizers by HR-CS F MAS and Cl in milk by HR-CS GF MAS. Chlorine, N, P and S were measured via CaCl (10 band heads), NO (13 band heads), PO (13 band heads) and CS (14 band heads), respectively. No statistically significant differences were observed between Cl, N, P and S concentrations determined by MEC and by the conventional external standard calibration (paired t-test at a 95% confidence level, n = 3). Recoveries were in the 97-109% (Cl), 97-103% (P), 99-109% (S) and 98-99% (N) intervals, and the relative standard deviations (n = 12) for Cl, N, P, and S were typically 6%, 3%, 2% and 2%, respectively.