A simple and fast method for assessment of the nitrogen-phosphorus-potassium rating of fertilizers using high-resolution continuum source atomic and molecular absorption spectrometry

Autor(es)

Bechlin, Marcos Andre ^[1] ; Fortunato, Felipe Manfroi ^[1] ; da Silva, Ricardo Moutinho ^[1] ; Ferreira, Edilene Cristina ^[1] ; Gomes Neto, Jose Anchieta ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Analyt Chem, BR-14800060 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY; v. 101, p. 240-244, NOV 1 2014.
• Citações Web of Science: 7

Resumo

The determination of N, P, and K in fertilizers by high-resolution continuum source flame atomic and molecular absorption spectrometry is proposed. Under optimized conditions, measurements of the diatomic molecules NO and PO at 215360 and 247.620 nm, respectively, and K using the wing of the alternative line at 404.722 nm allowed calibration curves to be constructed in the ranges 500-5000 mg L-1 N (r = 0.9994), 100-2000 mg L-1 P (r = 0.9946), and 100-2500 mg L-1 K (r = 0.9995). Commercial fertilizers were analyzed by the proposed method and the concentrations of N, P, and K were found to be in agreement with those obtained by Kjeldahl, spectrophotometric, and flame atomic emission spectrometry methods, respectively, at a 95% confidence level (paired t-test). A phosphate rock certified reference material (CRM) was analyzed and the results for P and K were in agreement with the reference values. Recoveries from spiked CRM were in the ranges 97-105% (NO3--N), 95-103% (NH4+-N), 93-103% (urea-N), 99-108% (P), and 99-102% (K). The relative standard deviations (n = 12) for N, P, and K were 6, 4, and 2%, respectively. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/13500-9 - Avaliação do bismuto como padrão interno para chumbo em técnicas espectrométricas
• Beneficiário: José Anchieta Gomes Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/23323-7 - Método de adição de padrão interno por gradiente de concentração em fluxo em técnicas espectroscópicas
• Beneficiário: Felipe Manfroi Fortunato
• Modalidade de apoio: Bolsas no Brasil - Doutorado