Spark Discharge-LIBS: Evaluation of One-Point and Multi-Voltage Calibration for P and Al Determination

Author(s)

Vieira, Alan Lima ^[1] ; Ferreira, Edilene Cristina ^[1] ; Santos Junior, Dario ^[2] ; Senesi, Giorgio Saverio ^[3] ; Gomes Neto, Jose Anchieta ^[1]

Affiliation

^[1] Sao Paulo State Univ UNESP, Analyt Chem Dept, POB 355, BR-14801970 Araraquara, SP - Brazil

^[2] Fed Univ Sao Paulo UNIFESP, Chem Dept, BR-09913030 Diadema, SP - Brazil

^[3] CNR Ist Sci & Tecnol Plasmi ISTP, Sede Bari, Via Amendola 122-D, I-70126 Bari - Italy

• Document type: Journal article
• Source: ATOMIC SPECTROSCOPY; v. 42, n. 1, p. 18-24, JAN-FEB 2021.
• Web of Science Citations: 0

Abstract

Spark discharge (SD) laser-induced breakdown spectroscopy (LIBS) is a technique suitable to overcome the low energies of lasers by reheating the plasma, increasing the emission intensities and to perform single-standard calibration. A calibration method called one-point and multi-voltage calibration (OP-MVC), which requires two different voltages applied to both the standard and the sample, is proposed for use with SD-LIBS. The performance of this method was compared to that of the one-point and multi-lines calibration (OP-MLC) and the slope ratio calibration (SRC) methods for LIBS determination of Al in certified reference plant leaves and P in commercial fertilizers. No statistical differences at the 95% confidence level were observed between the Al and P concentrations determined by OP-MVC LIBS for the Al certified values and the P values measured by high-resolution continuum-source flame atomic absorption spectrometry (HR-CS FAAS). The limit of detection (LOD) for P was 0.60 wt% P2O5 and 35.1 mg kg(-1) for Al. The relative standard deviation (n=3) was typically 7% for Al and in the 4 - 10% range for P. (AU)

• FAPESP's process: 19/07537-6 - STRATEGIC STUDIES OF SPECTROCHEMICAL ANALYSIS BY HR-CS AAS, LIBS AND RAMAN SPECTROSCOPY
• Grantee: José Anchieta Gomes Neto
• Support Opportunities: Regular Research Grants