Determination of Zinc and Copper in Brasenia schreber J.F.Gmel by Microwave Digestion and Atomic Absortion Spectrometry

Using the microwave digestion system, the zine and copper in Brasenia schreber J.F.Gmel were determined by microwave-digestion atomic absortion spectrometry in this paper. Using L9(34)orthogonal experiment, the effects of the ratio of HNO3 to H2O2, the ratio of the sample to digestion solution, the digestion time and the digestion power were studied. The optimum digestion conditions are: HNO3/H2O2 (V/V) 1:1, sample/solution (g/ml) 1:12, the digestion time 6 min and the microwave power 700 W. Under the optimum digestion conditions, it is satisfactory to apply the microwave digestion procedure to determine respectively zine with the recovery of 98.40%～101.80% and the RSD of 6.19%, and copper with the recovery of 97.60%～ 102.80% and the RSD of 4.61%. The results showed that this method is rapid and simple with low reagent consumption and complete digestion.