Direct determination of calcium and phosphorus in mineral supplements for cattle by wavelength dispersive X-ray fluorescence (WD-XRF)

Autor(es)

Babos, Diego Victor ^[1] ; Costa, Vinicius Camara ^[1] ; Speranca, Marco Aurelio ^[1] ; Pereira-Filho, Edenir Rodrigues ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grp Appl Instrumental Anal, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 137, p. 272-276, MAR 2018.
• Citações Web of Science: 12

Resumo

The current study describes a simple and rapid method for the direct determination of Ca and P in mineral supplements for cattle by wavelength dispersive - X-ray fluorescence (WD-XRF). For calibration, solid standards obtained through a set of reference materials (RMs) of mineral supplements for cattle with concentrations of Ca ranged from 120 to 223 g kg(-1) (r = 0.9809) and P ranged from 29 to 95 g kg(-1) (r = 0.9957) were used. For Ca, the matrix-matching using the RM 18/03 diluted in Na2CO3: NaCl (1:1 w/w) in the range of 0-204 g kg(-1) (r = 0.9975) was also used as calibration strategy. The proposed method presented limits of detection of 47 mg kg(-1) for Ca and 36 mg kg(-1) for P using calibrations with RMs and 61 mg kg(-1) to Ca using matrix matching calibration strategy. Accuracy was assessed by the analysis of four RM of mineral supplements for cattle. A statistical evaluation using student's t-test showed that there is no significant difference between the value obtained with the proposed method and the certified value, at 95% confidence level. The method was successfully applied and is a good alternative to conventional add digestion routine analysis for determination of Ca and P in mineral supplements for cattle. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 16/01513-0 - Combinação de LIBS (Laser-Induced Breakdown Spectroscopy) e ICP OES (Inductively Coupled Plasma Optical Emission Spectrometry) na análise de amostras de resíduo eletrônico (circuito eletrônico e polímeros), alimentos e líquidas de difícil preparação
• Beneficiário: Edenir Rodrigues Pereira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular