Laser-induced breakdown spectroscopy determination of K in biochar-based fertilizers in the presence of easily ionizable element

Autor(es)

de Morais, Carla Pereira ^[1] ; Barros, Ariane Isis ^[1] ; Bechlin, Marcos Andre ^[1] ; Silva, Tiago Varao ^[1] ; Santos Junior, Dario ^[2] ; Senesi, Giorgio Saverio ^[3] ; Crespi, Marisa Spirandeli ^[1] ; Ribeiro, Clovis Augusto ^[1] ; Gomes Neto, Jose Anchieta ^[1] ; Ferreira, Edilene Cristina ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Dept Analyt Chem, POB 355, BR-14801970 Araraquara, SP - Brazil

^[2] Univ Fed Sao Paulo, UNIFESP, Dept Chem, Rua Sao Nicolau, 210 Ctr, BR-09913030 Diadema, SP - Brazil

^[3] CNR, Ist Nanotecnol NANOTEC, PLasMI Lab, Via Amendola 122-D, I-70126 Bari - Italy

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 188, p. 199-202, OCT 1 2018.
• Citações Web of Science: 3

Resumo

Laser-induced breakdown spectroscopy is an optical emission technique quite suitable for the analysis of recalcitrant materials as it eliminates complex procedures of sample preparation. However, for some simple LIBS instrumentation the detection limits are still higher compared to those of consolidated spectroscopic techniques. The aim of the present work was to develop a method for the determination of K in new biochar-based fertilizer samples using a simple single pulse LIES arrangement. Due to the low K detectability, which made impossible to obtain calibration curves, an exploratory qualitative study was performed aiming to evaluate the influence of the addition of easily ionizable elements (EIE) on the sensitivity. To this aim different salts containing EIE (K, Li and Na) and other cations (Cu and Mg) have been evaluated. Results obtained showed that salts containing EIE cations increased the spectral emission signals of some elements in samples previously submitted to charring. In particular, the strategy of using Li+ was applied to the determination of K in biochar-based fertilizers. The addition of Li+ allowed to develop an analytical method for K determination featuring a linear dynamic range from 0.8% to 21.56% K, and limits of detection and quantification of 0.2% and 0.8%, respectively. (AU)

• Processo FAPESP: 15/24757-9 - Avaliação da técnica LIBS para determinação de Ca, K, P e N em novos fertilizantes inteligentes e sustentáveis
• Beneficiário: Edilene Cristina Ferreira
• Modalidade de apoio: Auxílio à Pesquisa - Regular