Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 41, Pages 7890-7898Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b04028
Keywords
laser-induced breakdown spectroscopy (LIBS); fertilizers; chemometrics; solid sample analysis
Funding
- Sao Paulo Research Foundation (FAPESP) [2015/14488-0, 2012/01769-3, 2012/50827-6]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [401074/2014-5, 305637/2015-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [12/01769-3] Funding Source: FAPESP
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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).
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