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 3

The analytical results of different pretreatment procedures for black shale (ng·g⁻¹).

Sample

Without KNO3

With KNO3

Au

Pt

Pd

Ru

Rh

Ir

Au

Pt

Pd

Ru

Rh

Ir

Black shale 1

174 ± 2.5

473 ± 31

456 ± 17

1.22 ± 0.09

0.31 ± 0.02

1.51 ± 0.12

209 ± 18

505 ± 34

520 ± 28

7.42 ± 0.54

17.1 ± 1.22

3.78 ± 0.21

Black shale 2

102 ± 10

220 ± 15

227 ± 13

0.86 ± 0.04

0.24 ± 0.01

1.48 ± 0.06

149 ± 11

243 ± 14

257 ± 12

4.90 ± 0.25

9.16 ± 0.43

2.75 ± 0.13

Note: all the values were determined by Bi-FA ICP-MS. Sample was placed into the furnace burn at 700°C.