ETAAS determination of essential and potentially toxic trace elements in Antarctic Krill certified reference material: Evaluation of two microwave digestion procedures

摘要

Seven potentially toxic and/or environmentally relevant trace elements, namely Cd; Cr, Cu, Fe, Mn, Ni, and Pb, were determined by electrothermal atomic absorption spectrometry (ETAAS). Two microwave (MW) acid assisted digestion methods (with HNO3/H2O2 and HNO3/HF) were tested to mineralize the certified reference material MURST-ISS-A2, Antarctic Krill. The effect of power and time parameters was tested to investigate the influence of the matrix on analyte recovery. The use of the mixture of Pd and Mg(NO3)(2) as the m-matrix modifier in the ETAAS determination increased the thermal stabilization of Cd and Pb significantly. The detection limits ranged between 3 and 35 ng g(-1) and the dynamic range of the method spared one order of magnitude. The precision was better than 5% in all cases when peak area absorbance was used. The results obtained were in good agreement with the certified values. [References: 22]