Simultaneous optimization by neuro-genetic approach for analysis of plant materials by laser induced breakdown spectroscopy

Comparison of univariate and multivariate calibration for the determination of micronutrients in pellets of plant materials by laser induced breakdown spectrometry

“…Wavelength calibration was performed using a Hg spectral lamp. Time delay, integration time gate, number of pulses and detector amplification gain, previously optimized by a neuro-genetic approach [72], were 9 µs, 1.1 µs, 30 pulses and 225 a.u, respectively. The spectral region from 180 to 440 nm was exploited for wavelengths selection.…”

Laser Induced-Breakdown Spectroscopy (Libs): Histórico, Fundamentos, Aplicações E Potencialidades

“…Esses parâmetros comumente são otimizados através de planejamento experimental a fim de obter uma condição ótima ou de compromisso. [80][81][82][83][84] Em trabalho proposto por Castro e Pereira-Filho, 43 a LIBS foi usada para análise direta de ligas metálicas, e as condições instrumentais (energia do pulso do laser, tempo de atraso e área do pulso) foram otimizadas utilizando planejamento do tipo Doehlert. No trabalho proposto por Andrade e Pereira-Filho, 85 a LIBS foi empregada para análise direta de fertilizantes.…”

Discrimination of organic solid materials by LIBS using methods of correlation and normalized coordinates

“…The electron density is calculated from the Stark broadening of O(I) at 777.4 nm for cellulose, whose Lorentzian line shape function is shown in of the stark broadened line is shown in Eq. (8).…”

“…Another aspect is the fact that applying univariate procedures, it will be rarely possible to reach really optimized values. Multivariate techniques are alternative, economical and effective methods that allow the simultaneous optimization of more than one variable [8]. Univariate and multivariate calibration have been compared and both have showed a similar performance in accuracy and precision [9].…”