DETERMINATION OF TRACES OF COPPER, CADMIUM AND LEAD IN BIOLOGICAL ANDENVIRONMENTAL-SAMPLES BY FLOW-INJECTION ISOTOPE-DILUTION INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY

Flow-injection isotope dilution inductively coupled plasma mass spectr ometry (ICP-MS) was applied to the determination of Cu, Cd and Pb in s everal biological and environmental reference materials. The isotope r atios for each injection were calculated from the areas of the flow-in jection peaks. The precision for the isotope ratio determination was b etter than 1%. Detection limits were 45, 25 and 58 ng l(-1) for Cu, Cd , and Pb, respectively. The flow-injection isotope dilution method was successfully applied to the determination of Cu, Cd and Pb in a urine reference sample (NIST SRM 2670). A preconcentration system was used for the separation of Na and Mg matrix elements and preconcentration o f traces of Cu, Cd and Pb in SLRS-2 riverine water and CASS-2 open oce an sea-water reference samples.