Lithium, isotope ratio

Lithium is one of the rare elements where the lighter isotope is less abundant than the heavier one. In order to be consistent with the other isotope systems lithium isotope ratios are reported as 8 Li-values. 

DIP Lithium isotope ratios are important to medicine, geology, astrophysics, and nuclear chemistry. Measurements of the 6Li/7Li ratio in a Standard Reference Material are given here.12 Do the two methods give statistically equivalent results ... 

Gregoire, D. C., Acheson, B. M., and Taylor, R. P. (1996). Measurement of lithium isotope ratios by inductively coupled plasma mass spectrometry Application to geological materials./Anal. At. Spectrom. 11(9), 765. 

Abstract. AGB stars, in particular those of carbon types, are excellent laboratories to constraint the theory of stellar structure, evolution and nucleosynthesis. Despite the uncertainties still existing in the chemical analysis of these stars, the determination of the abundances of several key species in their atmospheres (lithium, s-elements, carbon and magnesium isotopic ratios etc.) is an useful tool to test these theories and the mixing processes during the AGB phase. This contribution briefly review some recent advances on this subject. 

Yamaji K, Makita Y, Watanabe H, Sonoda A, Kanoh H, Hirotsu T, Ooi K (2001) Theoretical estimation of lithium isotopic reduced partition function ratio for lithium ions in aqueous solution. J Phys Chem A105 602-613... 

Lithium is an important element in many industries (Bach 1985). Lithium is used medically as a treatment for bipolar disorders (Schou 1988). Lithium toxicity, especially to the renal system, is problematical. Estimating systemic elemental mass balance, especially for patients receiving oral Li dosing, is important, and is one area in which Li isotope ratios are... 

Foustoukos DI, James RH, Seyfried Jr WE (2003) Lithium isotopic systematics of the Main Endeavor Field vent fluids. Northern Juan de Fuca Ridge. Geochim Cosmochim Acta 67 A101 Franklin KJ, Halliday JD, Plante LM, Symons EA (1986) Measurement of the Li-6 Li-7 isotope ratio for lithium-salts hy FT NMR-spectroscopy. J Magnet Resonance 67 162-165 Fritz SJ (1992) Measuring the ratio of aqueous diliusion coefficients between Li Ck and Li Cf by osmometry. Geochim Cosmochim Acta 56 3781-3789... 

Schwab AB, O Connell ME, Long SE (1995) The use of lifiiium concenh ation data and isotopic ratios as hydrologic tracers in a first-order catchment. Geol Soc Am Prog Abst 27 A97 Schou M (1988) Lithium h eahnent of manic-depressive illness—Past, present and perspectives. J Am Med Ass 259 1834-1836... 

Lithium isotopes do not fractionate as a result of redox reactions, but Li is preferentially partitioned into the fluid phase, whereas Li prefers sites in alteration minerals such as micas. The Li/ Li ratios of mica and chlorite in alteration zones around uranium deposits are higher and decrease to lower values with distance from the ore relative to background mica in the Athabasca Group sandstones. In barren areas, high ratios are rare and background ratios are dominant. When used together, the isotopic composition of uranium and lithium can be utilized to refine both the genesis of uranium deposits and as exploration tools. 

Application of ICP-MS in geology and the semiconductor industry has been reviewed. The Li Li isotopic ratio of the stable lithium isotopes is an important parameter in geological and chemical studies. This ratio may be determined by thermal MS... 

The prospect of separating lithium isotopes on a large scale by the extraction of lithium from aqueous solutions is not very promising. In the system we have studied, reflux could be accomplished by an acid-base mechanism however, because of the small separation factor, an extremely large reflux ratio would be required. This would necessitate a very large plant using enormous quantities of acid and base, and the cost would be excessive. 

Lithium isotopic signatures (5 Li) have been used in conjunction with lithium, bromine, strontium, calcium, and chlorine concentrations and ratio plots (discussed earlier), to assess the origin of salinity in deep, saline waters in... 

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