Determination of arc concentration of hafnium and tantalum in geological samples

A method for the determination of hafnium and tantalum in geological samples was reported in this paper. The volatile matrix elements were evaporated from major elements in advance through carefully selecting of electrode sizes, the ratio of buffer and indicator, internal standard and the conditions of spectrographic analysis based on the principle of the sample fractionation effects, and then the major elements were concentrated effectively. The spectrographic analysis method provides the advantages of simple operation, high efficiency and high sensitivity and has been verified by analyzing the national standard reference materials and the results are agreement with certified values.