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

TALANTA

卷:152

Article

de Babos, Diego Victor¹  Bechlin, Marcos Andre¹  Barros, Ariane Isis¹  Ferreira, Edilene Cristina¹  Gomes Neto, Jose Anchieta¹  de Oliveira, Silvana Ruella² 

[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

关键词: Micronutrients;    Molybdenum;    Nickel;    High-resolution continuum source graphite furnace atomic absorption spectrometry;    Direct solid sample analysis;    Internal standardization;   

DOI  :  10.1016/j.talanta.2016.02.046

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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