Quantitative determination of trace level (ng g−1) contents of rhodium and palladium in copper-rich minerals using LA-ICP-MS

摘要: This study reports on the efficacy of measuring low ng g−1 contents Rh and Pd in Cu-rich minerals by laser ablation single quadrupole (Agilent 7700x) tandem MS 8900x) ICP-MS, using helium (He) collision gas a mixture ammonia (NH3)/He (10%/90%) reaction gas, respectively, to attenuate CuAr interferences 103Rh 105Pd. Results are compared with values obtained from digested separates same (three synthetic Fe sulphides, seven samples chalcopyrite (CuFeS2) two bornite (Cu5FeS4) containing 24.17% 63.31% Cu, less than 10 250 Pd) analyzed an Agilent 8800x ICP-MS/MS NH3/He mode. Using LA-ICP-MS/MS at optimized flow rate (0.3 mL min−1), contributions 105Pd were 2.3 g−1, which was reduction more orders magnitude those LA-ICP-MS He (5 min−1). The method limits detection (MLOD) for (1.7 g−1) (7.0 110 μm spot size approximately order lower (16 48 rate. accuracy (difference separates) precision (1RSD) g−1-level measurements (105Pd) range 0.5% 19% 31%, respectively. Moreover, this shows that neither linear interference correction strategy nor procedure P. J. Sylvester, Mineral. Assoc. Can., Short Course Ser., 2001, vol. 29, p. 203 works effectively accurate precise measurement minerals. most ca. 100 is achieved 8900x MS/MS acquisition mode without correction. These results demonstrate potential be widely used quantitative determination trace level light PGE transition metal sulphide