Phosphorus quantification in fertilizers using laser induced breakdown spectroscopy (LIBS): a methodology of analysis to correct physical matrix effects

Autor(es):Mostrar menos -

Marangoni, Bruno S. ^[1] ; Silva, Kleydson S. G. ^[2] ; Nicolodelli, Gustavo ^[2] ; Senesi, Giorgio S. ^[3] ; Cabral, Jader S. ^[4] ; Villas-Boas, Paulino R. ^[2] ; Silva, Caroline S. ^[5] ; Teixeira, P. C. ^[6] ; Nogueira, Ana Rita A. ^[5] ; Benites, Vinicius M. ^[6] ; Milori, Debora M. B. P. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentacao, BR-13560970 Sao Carlos, SP - Brazil

^[3] CNR, Inst Inorgan Methodol & Plasmas, I-70126 Bari - Italy

^[4] Univ Fed Uberlandia, Inst Fis, BR-38400902 Uberlandia, MG - Brazil

^[5] Embrapa Pecuaria Sudeste, BR-13560970 Sao Carlos, SP - Brazil

^[6] Embrapa Solos, BR-22460000 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANALYTICAL METHODS; v. 8, n. 1, p. 78-82, 2016.
• Citações Web of Science: 26

Resumo

The aim of this study was to develop a quantitative method to determine phosphorus in fertilizers of different matrix compositions using the laser induced breakdown spectroscopy (LIBS) technique. The LIBS spectra were acquired on 26 samples of organic and inorganic fertilizers by using a low cost, portable, gated CCD system in the atmospheric environment. Inductively coupled plasma optical emission spectroscopy (ICP-OES) was used as the reference technique. A method was developed to remove the outlier spectra and perform the baseline correction and peak normalization. By applying the proposed corrections, the linear correlation between LIBS and ICP increased from R = 0.76 to R = 0.95. An average error of 15% found in cross-validation of LIBS quantification appeared feasible for P quantification in fertilizers. Two reference samples with different matrix compositions were also analyzed, and the absolute error in the quantification was below 5%. Further, no significant fluctuation was found in P quantification when LIBS was performed over 150 days. (AU)

• Processo FAPESP: 13/02165-7 - Desenvolvimento de novo método para quantificação de nutrientes e contaminantes em fertilizantes: novo uso da ferramenta libs
• Beneficiário: Bruno Spolon Marangoni
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado