Abstract
In the present study, an easy and fast microwave-assisted digestion method combined with flame atomic absorption spectrometry (FAAS) was developed for zinc and copper determinations in milk samples. The irradiation power, volume of nitric acid, temperature and digestion time were selected for optimization in this work study. The results of 2-level full factorial (2(4)) design based on analysis of variance (ANOVA) and Pareto chart showed that all of factors were statistically significant. The optimal conditions for the analytes extraction in milk samples were obtained by response surface methodology (RSM) based on Box-Behnken experimental design. The conditions of work were accepted as an agreement between optimal values that were found for the analytes. These values were 110 °C, 450 W, 4.0 mL and 21.0 min for temperature, irradiation power, volume of nitric acid and digestion time, respectively. This procedure was applied to the zinc and copper determinations in milk samples.
Highlights
Mostafa Khajeh*Um método fácil e rápido de digestão assistida por micro-ondas combinado com espectrometria de absorção atômica por chama (FAAS) foi desenvolvido para determinações de zinco e cobre em amostras de leite
Milk provides all macronutrients and all micronutrients
Factorial design demonstrated that the factors: power, temperature, volume of nitric acid and digestion time in the studied levels need a final optimization
Summary
Um método fácil e rápido de digestão assistida por micro-ondas combinado com espectrometria de absorção atômica por chama (FAAS) foi desenvolvido para determinações de zinco e cobre em amostras de leite. The irradiation power, volume of nitric acid, temperature and digestion time were selected for optimization in this work study. The optimal conditions for the analytes extraction in milk samples were obtained by response surface methodology (RSM) based on Box-Behnken experimental design. The conditions of work were accepted as an agreement between optimal values that were found for the analytes These values were 110 °C, 450 W, 4.0 mL and 21.0 min for temperature, irradiation power, volume of nitric acid and digestion time, respectively. This procedure was applied to the zinc and copper determinations in milk samples
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