An improved method of Tl purification for high precision measurement of Tl isotopes by MC-ICP-MS

Thallium (Tl) isotopes are valuable geochemical tracers widely applied in planetary evolution, redox history of ancient oceans, pollution source tracing, and crustal recycling. Contemporary Tl isotope analyses generally rely on either the standard-sample bracketing or element-doping approach to correct for mass bias. However, complex matrices and residual Pb can introduce correction artifacts, making efficient Tl purification a prerequisite for obtaining accurate isotope data. In this study, we