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 1

ICP-MS operation conditions.

ICP-MS plasma
Rf power	1550 W
Sampling depth	5.0 mm
Nebulizer gas flow	1.00 L·min^−1
Auxiliary gas flow	0.80 L·min^−1
Cool gas flow	14.0 L·min^−1
Sampler/skimmer diameter orifice	Nickel 1.0 mm/0.5 mm
Peristaltic pump speed	40 rpm
Time-resolved data acquisition
Survey runs	Jump
Channels	1
Number of sweeps	40
Dwell time	10 ms
Measurement mode	STD
Isotopes	^197Au,^195Pt,^106Pd,^101Ru,^103Rh,^193Ir, and^185Re