Autor(es):
De Babos, Diego Victor [UNESP] ; Bechlin, Marcos André [UNESP] ; Barros, Ariane Isis [UNESP] ; Ferreira, Edilene Cristina [UNESP] ; Neto, José Anchieta Gomes [UNESP] ; De Oliveira, Silvana Ruella
Data: 2018
Identificador Persistente: http://hdl.handle.net/11449/177847
Origem: Oasisbr
Assunto(s): Direct solid sample analysis; High-resolution continuum source graphite furnace atomic absorption spectrometry; Internal standardization; Micronutrients; Molybdenum; Nickel; Direct solid sample analysis; Direct solid sample analysis; High-resolution continuum source graphite furnace atomic absorption spectrometry; High-resolution continuum source graphite furnace atomic absorption spectrometry; Internal standardization; Internal standardization; Micronutrients; Micronutrients; Molybdenum; Molybdenum; Nickel; Nickel
Descrição
Made available in DSpace on 2018-12-11T17:27:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-05-15
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.
São Paulo State University Unesp Analytical Chemistry Department, P.O. Box 355
University of São Paulo USP FFCLRP Department of Chemistry
São Paulo State University Unesp Analytical Chemistry Department, P.O. Box 355
