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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Bechlin, Marcos Andre [1] ; Fortunato, Felipe Manfroi [1] ; da Silva, Ricardo Moutinho [1] ; Ferreira, Edilene Cristina [1] ; Gomes Neto, Jose Anchieta [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Dept Analyt Chem, BR-14800060 Araraquara, SP - Brazil
Número total de Afiliações: 1
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
Linha de fomento: 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
Linha de fomento: Bolsas no Brasil - Doutorado