Cobalt internal standard for Ni to assist the simultaneous determination of Mo and Ni in plant materials by high-resolution continuum source graphite furnace atomic absorption spectrometry employing direct solid sample analysis

Autor(es)

de Babos, Diego Victor ^[1] ; Bechlin, Marcos Andre ^[1] ; Barros, Ariane Isis ^[1] ; Ferreira, Edilene Cristina ^[1] ; Gomes Neto, Jose Anchieta ^[1] ; de Oliveira, Silvana Ruella ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Dept Analyt Chem, POB 355, BR-14801970 Araraquara, SP - Brazil

^[2] Univ Sao Paulo, FFCLRP, Dept Chem, BR-14040901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 152, p. 457-462, MAY 15 2016.
• Citações Web of Science: 7

Resumo

A new method is proposed for the simultaneous determination of Mo and Ni in plant materials by high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS), employing direct solid sample analysis (DSS) and internal standardization (IS). Cobalt was used as internal standard to minimize matrix effects during Ni determinations, enabling the use of aqueous standards for calibration. Correlation coefficients for the calibration curves were typically better than 0.9937. The performance of the method was checked by analysis of six plant certified reference materials, and the results for Mo and Ni were in agreement with the certified values (95% confidence level, t-test). Analysis was made of different types of plant materials used as renewable sources of energy, including sugarcane leaves, banana tree fiber, soybean straw, coffee pods, orange bagasse, peanut hulls, and sugarcane bagasse. The concentrations found for Mo and Ni ranged from 0.08 to 0.63 ng mg(-1) and from 0.41 to 6.92 ng mg(-1), respectively. Precision (RSD) varied from 2.1% to 11% for Mo and from 3.7% to 10% for Ni. Limits of quantification of 0.055 and 0.074 ng were obtained for Mo and Ni, respectively. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/12595-1 - Avaliação da amostragem direta de sólidos aliada a espectrometria de absorção atômica com fonte contínua e de alta resolução em análises químicas de amostras de difícil solubilização
• Beneficiário: José Anchieta Gomes Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular