The Spectrographic Analysis of Noble Metals in Solution PDF Download

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Book Description
The use of the rotating disc as a means of analysis for solutions of noble metals was examined. A half-inch graphite disc (Ringsdorff RW0058) was used and pushed onto a cone-shaped graphite rod. The solution was contained in a small Teflon boat of approximately 0,6 ml capacity. In a determination of the excitation conditions giving the best line-to-background ratio, the range of operating conditions, which is given in a table, was examined. The rotating disc method has adequate sensitivity and precision to be used for the analysis of noble metals in solutions of prills which contain very little or no base metals. The presence of as little as 2 mg of base metal generally means that base metal is the major element present, and because the various cations are concentrated into such a small volume, matrix effects can be expected to be serious and not adequately compensated for by the introduction of a buffer such as lithium metaborate (because of its limited solubility). At first sight, this appears to be a great restriction on the usefulness of the method. Subsequent work with atomic absorption and X-ray fluorescence has shown that it is preferable for base metals to be removed, ideally by ion-exchange techniques. Where this becomes necessary, the emission-spectrographic procedure is again applicable to the analysis of the resulting solutions, particularly where the determination of trace amounts of noble metals in eluates from ion-exchange methods is required, where neither atomic absorption or X-ray fluorescence really possesses adequate sensitivity for a reliable analysis.