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
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Data
2014-11-01
Autores
Bechlin, Marcos Andre [UNESP]
Fortunato, Felipe Manfroi [UNESP]
Silva, Ricardo Moutinho da [UNESP]
Ferreira, Edilene Cristina [UNESP]
Gomes Neto, José Anchieta [UNESP]
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Editor
Elsevier B.V.
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.
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NPK fertilizer, HR-CS FAAS, HR-CS FMAS
Como citar
Spectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-elsevier Science Ltd, v. 101, p. 240-244, 2014.