Data/hora: 19/06/2024 17:56:38

Biblioteca(s): | Embrapa Instrumentação; Embrapa Soja.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 1
Data corrente: | 29/12/2022
Data da última atualização: | 29/12/2022
Autoria: | BORDUCHI, L. C. L.; MILORI, D. M. B. P.; MEYER, M. C.; VILLAS-BOAS, P. R.
Afiliação: | DEBORA MARCONDES BASTOS PEREIRA, CNPDIA; MAURICIO CONRADO MEYER, CNPSO; PAULINO RIBEIRO VILLAS BOAS, CNPDIA.
Título: | Reducing matrix effects on the quantification of Ca, Mg, and Fe in soybean leaf samples using calibration-free LIBS and one-point calibration.
Ano de publicação: | 2022
Fonte/Imprenta: | Spectrochimica Acta Part B: Atomic Spectroscopy, v. 198, a106561, 2022.
Páginas: | 1 - 9
ISSN: | 0584-8547
DOI: | https://doi.org/10.1016/j.sab.2022.106561
Idioma: | Inglês
Conteúdo: | Matrix effects are one of the most difficult analytical challenges in laser-induced breakdown spectroscopy (LIBS), since signal intensity depends on both element concentration and matrix. For instance, the measurement of nutrients in plant leaves using LIBS is notably impacted by matrix effects because of differences in fertilizer application, weather, soil properties, and health levels. Thus, to overcome matrix effects on the quantification of nutrients in plant leaves, we propose the use of CF-LIBS, in which the intensity of emission lines is corrected using the one-point calibration (OPC) method. In this study, we analyzed thirty soybean leaf samples of cultivars from various locations and health levels with 0.5 wt% TiO2 (internal standard), for which the matrix effects were visible in the calibration curves. Normalization using a Ti II line increased the average r 2 of the calibration curves for Ca II, Mg II, and Fe II from 0.24 to 0.73, but this was insufficient to adjust for the variations in plasma temperature and for the degree to which the elements were ionized. With the proposed models and using just one sample to calibrate the OPC factors, we obtained an accuracy >92% and an average r 2 of 0.87 for the quantification of Ca, Mg, and Fe in relation to the atomic absorption spectroscopy (AAS). We then concluded that CFLIBS with the OPC corrections might mitigate matrix effects in LIBS analysis of soybean leaf samples. More studies are needed to assess whether the OPC factors calibrated with soybean leaf samples can be applied to other species.
Palavras-Chave: | Calibration-free; LIBS; Matrix effects; Soybean leaf samples.
Thesagro: | Espectrometria; Soja.
Thesaurus Nal: | Calibration; Lasers; Soybeans; Spectroscopy.

Categoria do assunto:

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X Pesquisa, Tecnologia e Engenharia

Registro original: | Embrapa Instrumentação (CNPDIA)

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