Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multi-energy calibration for the determination of non-metals by high-resolution continuum source molecular absorption spectrometry

Full text
Author(s):
Vieira, Alan L. [1] ; Goncalves, Daniel A. [2] ; Virgilio, Alex [1] ; Ferreira, Edilene C. [1] ; Jones, Bradley T. [3] ; Donati, George L. [3] ; Gomes Neto, Jose A. [1]
Total Authors: 7
Affiliation:
[1] Sao Paulo State Univ, UNESP, POB 355, BR-14801970 Araraquara, SP - Brazil
[2] Minas Gerais State Univ UEMG, Dept Chem, BR-38302192 Ituiutaba, MG - Brazil
[3] Wake Forest Univ, Dept Chem, Salem Hall Box 7486, Winston Salem, NC 27109 - USA
Total Affiliations: 3
Document type: Journal article
Source: Journal of Analytical Atomic Spectrometry; v. 34, n. 5, p. 972-978, MAY 1 2019.
Web of Science Citations: 2
Abstract

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. (AU)

FAPESP's process: 14/18393-1 - Evaluation of gradient flow analysis as calibration strategy for spectroanalytical techniques with plasma source
Grantee:Alex Virgilio
Support Opportunities: Scholarships in Brazil - Post-Doctoral