Abstract
The absolute abundance of the lithium isotopes in natural sources from North America and Africa has been determined. The absolute 6Li/ 7Li ratio from thirteen spodumene samples was found to be 0.08182 ± 0.00033. This ratio for a batch of reagent Li 2CO 3 was found to be 0.d07926 and for Li 2NaPO 4 from Searle's Lake was found to be 0.07957. Considering the thirteen spodumene samples to represent the principal commercial sources of lithium, an atomic weight of 6.9403 ± 0.0005 is calculated for the element on the basis of these absolute abundances and values for the nuclidic masses.
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