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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Simultaneous determination of phosphite and phosphate in fertilizers by Raman spectroscopy

Full text
Author(s):
Oliveira, Evilim M. [1] ; Rogero, Marilia [1] ; Ferreira, Edilene C. [1] ; Gomes Neto, Jose A. [1]
Total Authors: 4
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 246, FEB 5 2021.
Web of Science Citations: 0
Abstract

Raman spectroscopy is emerging and powerful technique for identifying oxyanions of phosphorus, but it still is not straightforward applied to identify and quantify simultaneously phosphite and phosphate species in solution. Herein, simultaneous determination of phosphate (PO4) and phosphite (PO3) in fertilizer were evaluated by Raman spectroscopy. The influence of pH on Raman spectra of species was evaluated at various solution pH values, and the results showed accurate and selective analysis for phosphate and phosphite by using pH = 10.0 and bands located at 874 cm(-1) and 2321 cm(-1), respectively. Linear working range in the 0.15%-6.20% (w/v) P concentration was consistently obtained with regression coefficients (r) of 0.9953 (PO4) and 0.9945 (PO3). The limits of detection were 0.10% (w/v) P (PO4) and 0.05% (w/v) P (PO3). Relative standard deviations were lower than 6% for samples containing 10% P2O5 (PO4) and 31% P2O5 (PO3). Commercial fertilizers were an-alyzed by the proposed method using external calibration and found concentrations of P were in agreement with those obtained by the comparative spectrophotometric method at the 95% confidence level (paired t-test). Recoveries of spiked samples were in the 92-110% range. (c) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 19/07537-6 - STRATEGIC STUDIES OF SPECTROCHEMICAL ANALYSIS BY HR-CS AAS, LIBS AND RAMAN SPECTROSCOPY
Grantee:José Anchieta Gomes Neto
Support Opportunities: Regular Research Grants
FAPESP's process: 19/04586-6 - Combining Raman spectroscopy and HR-CS mas for fertilizer analysis
Grantee:Evilim Martinez de Oliveira
Support Opportunities: Scholarships in Brazil - Scientific Initiation