Measurement of lithium isotope ratios b to seawater and natural carbonates†

i) d col pg) thiu elu nal tio pr S (A e w da od m y o ns o Lithium isotopes have the potential to provide insights into tion of d Li and Li/Ca record of long-term evolution of seawater hydrothermal weathering.12–16 High precision lithium isotope ratio measurements have been onization mass spectrometry,17–20 by quadrupole ICP-MS by MC-ICP-MS (0.2 & to surements are susceptible to igh concentrations of matrix ver, ICP-MS methods are also zation interferences caused by elements. TIMS methods are tant instrumental fractionation mass requirement (>100 ng), 0 pg level) and variable matrix TIMS requires quantitative lements and filament loading of (Li-borate or Li-phosphate). ment during TIMS analyses ha