Determination of long-lived radionuclides by inductively coupled plasma quadrupole mass spectrometry using different nebulizers

摘要: Different nebulizers (cross-flow, ultrasonic and two microconcentric nebulizers) were used for sample introduction of radioactive solutions into a quadrupole-based inductively coupled plasma mass spectrometer (ICP-QMS). The best sensitivity (from 420 to 850 MHz, which is about one order magnitude higher in comparison with the cross-flow nebulizer) long-lived radionuclides ( 226 Ra, 230 Th, 237 Np, 238 U 241 Am) was observed using nebulizer. However, nebulizer, significantly size (26-fold) micronebulizers required. Sample by micronebulization small low picogram range method choice determination radionuclides. precision 10 ng l –1 concentration low-% (and sub-% range) all measurements different nebulizer types. detection limits aqueous applying 0.01-0.6 –1 . flow injection analysis approach optimized isotope dilution 232 Th (using 20 µl 5 µg –1 230 Th) ICP-QMS. isotopic abundance ratios 230 Th- mixtures 230 Th/ 232 Th=0.01, 0.001 0.0001) determined 1 Th relative external standard deviation long-term stability (over h) 0.17, 0.62 2.66%, respectively.