Isotopic compositions of Sr in waters and of Pb in sediments and ashes from an urban incinerator using an ICP-MS

The analytical precision of the Sr and the Pb isotopic compositions of natural samples obtained with a conventional ICP-MS is of 3 to 7 x 10-3 (internal 2 σ) for the 87Sr/86Sr ratio, 6 to 8 x 10-3 for the 206Pb/207Pb and 1 to 4 x 10-1 for the 206Pb/204Pb and 207Pb/204Pb ratios. Such accuracy is obtained with a procedure including a resin-chromatographic purification, a correction with respect to standard values (NBS 987 and 981) and a routine of four determinations for each sample. This procedure should allow rapid geochemical investigations ahead of more precise determinations by thermo-ionization mass spectrometry. (authors). 8 refs., 6 figs., 5 tabs