A new approach to mineralization of flaxseed (Linum usitatissimum L.) for trace element analysis by flame atomic absorption spectrometry.
A new approach to the analysis of Cu, Fe, Mn and Zn in flaxseed was developed based on infrared-assisted acid digestion. Quantitation by flame atomic absorption spectrometry yields results in agreement with those arising from aggressive total decomposition using conventional microwave-assisted (MW) digestions. A full factorial design in two levels was applied to evaluate the impact of significant variables for all elements to determine optimal experimental conditions. A desirability function revealed these to be: 2.0g sample mass, 8mL of HNO3and 8min of heating time in the IR system. Precision better than 10% (RSD) was obtained, superior to that of a combined IR-MW approach. Sample preparation based on IR-assisted digestion provides a rapid and inexpensive alternative to other conventional techniques for the analysis of complex samples and is able to accommodate relatively large masses of sample, alleviating potential homogeneity issues as well as enhancing detection power.
Laboratório de Estudos em Química Aplicada, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, 60455-760 Fortaleza, CE, Brazil.
João P S
JP
Oliveira
Laboratório de Estudos em Química Aplicada, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, 60455-760 Fortaleza, CE, Brazil.
Francisco L F
FL
Silva
Laboratório de Estudos em Química Aplicada, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, 60455-760 Fortaleza, CE, Brazil.
Raimundo J G
RJ
Monte
Laboratório de Estudos em Química Aplicada, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, 60455-760 Fortaleza, CE, Brazil.
Wladiana O
WO
Matos
Laboratório de Estudos em Química Aplicada, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, 60455-760 Fortaleza, CE, Brazil. Electronic address: gslopes@ufc.br.
Gisele S
GS
Lopes
D019597:Flax / Q000737:chemistry*; D005504:Food Analysis; D005511:Food Handling; D005514:Food Irradiation / Q000379:methods*; D007259:Infrared Rays; D057230:Limit of Detection; D012639:Seeds / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014131:Trace Elements / Q000032:analysis*
D014131:Trace Elements
FAAS; Flaxseed; Infrared radiation; Sample preparation; Trace elements