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A critical study of the application of graphite-furnace non-flame atomic absorption spectrometry to the deter-mination of trace base metals in complex heavy-matrix sample solutions
Authors:Romana B Cruz  Jon C Van Loon
Institution:Departments of Geology, Chemistry and the Institute of Environmental Sciences and Engineering, University of Toronto, Toronto M5S 1Al Canada
Abstract:Because of the extravagant claims made for the usefulness of non-flame atomic absorption spectroscopy, a critical evaluation of its performance in heavy matrix solutions, for selected trace heavy metals, was made. Studies of physical and chemical interference problems are presented for a range of inorganic and organic matrices. Often quoted remedies (e.g. selective volatilization, standard addition etc.) for solution of the more serious problems were found to be of little help in most cases. The influence of variables such as nature and flow rate of purge gas, ashing temperature and atomization temperature are also evaluated. Analyses for Cd, Cu, Pb, Zn, Ni, Co were done on samples by flame and nonflame methods in high solids solutions. While there appears to be an advantage to the non-flame method in dealing with sample solutions of high organic content, no advantage is apparent for either technique with highly inorganic matrices.
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