Abstract
The direct determination of lithium isotope abundances by atomic absorption spectrometry with a dual-beam instrument is described. A natural lithium hollow-cathode lamp and an enriched lithium-6 hollow-cathode lamp are both aligned on the optical axis. When a solution of lithium is nebulized into an air-acetylene flame, the difference in absorbance of the outputs of the two lamps, obtained in a single measurement and computed electronically, is proportional to the isotopic abundance. This relationship has been used as a basis for carrying out abundance measurements of 0–100 atom % lithium-6. The method is simple and rapid and compares favourably with the atomic absorption procedure based on absorbance ratios. The precision is ± 0.5 atom % lithium-6. The method is dependent on concentration with respect to total lithium content.
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