Bismuth-Remaining Cupellation Fire Assay Preconcentration Combined with Inductively Coupled Plasma Mass Spectrometry for the Simultaneous Determination of Ultratrace Au, Pt, Pd, Ru, Rh, and Ir in Geologic Samples

Table 4

Analytical performance data by the established Bi-FA ICP-MS method for Au, Pt, Pd, Ru, Rh, and Ir.

Isotopes	Linear range (ng·mL^−1)	Linear equation	R^2	BEC (ng·mL^−1)	LOD (ng·g^−1)	Enrichment factor
^197Au	0.01∼100	y = 98397x + 3170	0.9997	0.032	0.025	2000
^195Pt	0.01∼100	y = 70732x + 1006	0.9999	0.014	0.008	2000
^106Pd	0.01∼100	y = 65527x + 12474	0.9995	0.085	0.024	2000
^101Ru	0.01∼100	y = 42747x + 1066	0.9999	0.025	0.005	2000
^103Rh	0.01∼100	y = 242359x + 621	0.9999	0.003	0.002	2000
^193Ir	0.01∼100	y = 198777x + 456	0.9995	0.002	0.003	2000

LOD = 3standard deviation of background/slope of calibration curve, for 10 g sample. Enrichment factor was the specific value of the sample weight (10 g) before Bi-FA and the weight of Bi granule after Bi-FA (5 mg).