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Multicollector ICP-MS is used for the precise measurement of variations in the isotopic composition of germanium. Argon-based spectral interferences are assessed in the germanium mass region and the repeatability of the following ratios is determined: 74 Ge/ 70 Ge, 73 Ge/ 70 Ge and 72 Ge/ 70 Ge. The isotope ratio repeatability of a mono-elemental solution relative to another mono-elemental solution is better than 0.06% per u at 95% confidence. Variations in sample 74 Ge/ 70 Ge, 73 Ge/ 70 Ge, and 72 Ge/ 70 Ge ratios are expressed as d 74 Ge d 73 Ge and d 72 Ge units, respectively, which are deviations in parts per 10 3 from the same ratio in the standard solution. The addition of sodium and potassium to a standard solution of germanium having a known isotopic composition induces up to 4.4% decrease of d 74 Ge. This chemical bias is a result of a mass-dependent process and prevents the measurement of natural samples without chemical separation. Germanium is quantitatively separated from alkali matrix using liquid chromatography techniques.

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