Direct Determination of Contaminants and Major and Minor Nutrients in Solid Fertilizers Using Laser-Induced Breakdown Spectroscopy (LIBS)

Author(s)

Andrade, Daniel F. ; Pereira-Filho, Edenir Rodrigues

• Document type: Journal article
• Source: Journal of Agricultural and Food Chemistry; v. 64, n. 41, p. 7890-7898, OCT 19 2016.
• Web of Science Citations: 22

Abstract

Contaminants (Cd, Cr, and Pb) as well as minor (B, Cu, Mn, Na, and Zn) and major (Ca and Mg) elements were directly determined in solid fertilizer samples using laser-induced breakdown spectroscopy (LIBS). Factorial designs were used to define the most appropriate LIBS parameters and pellet pressure on solid fertilizers. Emission lines for all of the analytes were collected and employed 12 signal normalization modes. The best results were obtained using a laser energy of 75 mJ, a spot size of SO pm, a pressure of 10 t/in., and a delay of 2.0,us. Good correlation was-obtained between the calibration model's prediction using the proposed LIES method and the reference values obtained with ICP-OES. The limits of detection (LOD) for the proposed method varied from 2 mg/kg (for Cd) to 1% (for Zn). (AU)

• FAPESP's process: 15/14488-0 - Analytical method development for quality determination of fertilizers and tanning waste
• Grantee: Ana Rita de Araujo Nogueira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/01769-3 - Development of spectroanalytical methods for direct analysis of waste electrical and electronic equipments and cosmetics
• Grantee: Edenir Rodrigues Pereira Filho
• Support Opportunities: Regular Research Grants