Phosphorous Determination in Biochar-Based Fertilizers by Spark Discharge-Laser-Induced Breakdown Spectroscopy

Autor(es)

Dib, Samia Rodrigues ^[1] ; Senesi, Giorgio Saverio ^[2] ; Gomes Neto, Jose Anchieta ^[1] ; Ribeiro, Clovis Augusto ^[1] ; Ferreira, Edilene Cristina ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Chem Inst Araraquara, Dept Analyt Phys Chem & Inorgan Chem, POB 355, BR-14801970 Araraquara, SP - Brazil

^[2] CNR, Ist Sci Tecnol Plasmi ISTP Sede Bari, Via Amendola 122-D, I-70126 Bari - Italy

• Tipo de documento: Artigo Científico
• Fonte: CHEMOSENSORS; v. 9, n. 12 DEC 2021.
• Citações Web of Science: 0

Resumo

Biochar-based fertilizers are a new attractive alternative to P supplementation for crops, as they can gradually release the nutrient, avoiding losses and improving soil quality. In this regard, the evaluation of the P amount in biochar-based fertilizers is extremely important for their quality control. Analytical techniques that require sample solubilization are not very efficient for this task, as biochar is difficult to solubilize. Laser-induced breakdown spectroscopy (LIBS) is a promising technique to respond to this demand, as it enables a direct analysis of solid samples, avoiding the complicated process of sample solubilization. In this work, a novel method based on spark discharge (SD) coupled to LIBS was evaluated for P determination in biochar-based fertilizers prepared from three different biomasses. To overcome calibration problems in LIBS analysis, a matrix-matching procedure accomplished by the addition of eucalyptus biochar to calibration standards was used in experiments. This procedure minimized matrix effects and allowed us to achieve a satisfactory accuracy even when applied to similar but different matrices. Furthermore, the developed method is simple, fast, direct, does not generate post-analysis residues and appears appropriate for the quality control of sustainable biochar-based fertilizers and other biochar products. (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