The analytical capabilities of laser ablation (LA)-ICP-AAS in determining Li, Be and B at trace levels in geological samples have been tested on a series of glass reference materials and natural samples. The LA-ICP-MS instrument used consisted of a sector-field ICP-MS coupled with a laser ablation microprobe operating at either 266 or 213 nm wavelength. Reference glasses from NIST (SRM 612, 614 and 616) and MPI-DING (KL2-G, MOB-G, StHs6/80-G, GOR128-G, GOR132-G, T1-G and ATHO-G) were selected to develop the analytical method and to assess the best instrumental configuration. A series of calcic amphiboles with different Li, Be and B concentrations were also analysed using both LA-ICP-MS and SIMS to test the applicability of the method to natural minerals. Results indicated that with a spot size of 40 mu m the agreement between measured and reference values of Li, Be and B is generally better than 10% for NIST SRM 612 and 20% for NIST SRM 614. Average reproducibility at the 2s level was 10% for Li, 20% for Be and 15% for B. Limits of detection were approximately 100 ng g(-1) for Be and B and 200 ng g(-1) for Li. These results were confirmed by analyses carried out on natural amphiboles and compared well in terms of precision and accuracy with those commonly achieved by SIMS.
|Titolo:||Determination of lithium, beryllium and boron at trace levels by laser ablation-inductively coupled plasma-sector field mass spectrometry|
TIEPOLO, MASSIMO (Corresponding)
|Parole Chiave:||light lithophile elements; laser ablation; sector field ICP-MS; MPI-DING; NIST SRM glasses|
|Settore Scientifico Disciplinare:||Settore GEO/08 - Geochimica e Vulcanologia|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||10.1111/j.1751-908X.2005.tb00893.x|
|Appare nelle tipologie:||01 - Articolo su periodico|