Improving the accuracy of nickel and cobalt determination in full spectral analysis of rocks
Abstract
At present, qualitative and quantitative spectral analysis are being introduced into geological exploration in the search for and exploration of various fossils in order to study the material composition of host rocks, mineralization zones, minerals and ores, to study the distribution of rare and trace elements in various types of igneous and sedimentary rocks, as well as to solve other analytical problems. Particular attention should be paid to complete spectral analysis, which can simultaneously determine several dozen chemical elements using a spectrogram obtained by evaporating a 30-40 mg sample of the test sample in an electric arc between carbon electrodes (the test substance is placed in the recess of the lower electrode). The versatility and value of this research method are determined by the speed and the possibility of determining a large number of chemical elements and their content without the use of complex auxiliary equipment. In this case, the method is based on simple and accessible techniques of spectral analysis. In spectral analysis, quantitative determination is associated with an assessment of the intensity of the spectral lines of the elements being studied. The method of weakening lines using a logarithmic sector or filter uses visual determination of the intensity of spectral lines. We have carried out a number of experiments that have allowed us to evaluate the capabilities of the above method and, using nickel and cobalt as an example, to show the higher accuracy of simplified and rapid quantitative determinations of elements in the same samples.
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