Unnatural isotopic composition of lithium reagents
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Abstract
Isotopic analysis of 39 lithium reagents from several manufacturers indicates that seven were artificially depleted in 6Li significantly in excess of the variation found in terrestrial materials. The atomic weight of lithium in analyzed reagents ranged from 6.939 to 6.996, and δ7Li, reported relative to L-SVEC lithium carbonate, ranged from −11 to +3013‰. This investigation indicates that 6Li-depleted reagents are now found on chemists' shelves, and the labels of these 6Li-depleted reagents do not accurately reflect the atomic and (or) molecular weights of these reagents. In 1993, IUPAC issued the following statement: “Commercially available Li materials have atomic weights that range between 6.94 and 6.99; if a more accurate value is required, it must be determined for the specific material.” This statement has been found to be incorrect. In two of the 39 samples analyzed, the atomic weight of Li was in excess of 6.99.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Unnatural isotopic composition of lithium reagents |
| Series title | Analytical Chemistry |
| DOI | 10.1021/ac9704669 |
| Volume | 69 |
| Issue | 19 |
| Year Published | 1997 |
| Language | English |
| Publisher | ACS Publications |
| Contributing office(s) | National Research Program - Eastern Branch |
| Description | 3 p. |
| First page | 4076 |
| Last page | 4078 |
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