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APPLICATION NOTE

Tungsten-Copper-Gold-Magnetite Ore OREAS 700

SUMMARY

The application note summarizes the digestion of OREAS 700, a tungsten-copper-gold-magnetite ore, using ColdBlock™ Digestion Pro Series Technology.

Instrument: ColdBlock CBM Pro Series, chiller, ICP-OES
Published: June 2025
Digestion Time: 35 Minutes
Acid Used: HNO3, HCl, HF & H3BO3
Average ColdBlock Recovery vs. CRM:
  • 100% copper
  • 100% iron
  • 104% tungsten

METHODOLOGY

1. Set the chiller temperature to -5°C.
2. Weigh 0.25 g of each sample and transfer into a ColdBlock™ Digestion vessel
3. Add 20 mL of aqua regia (add HNO3 first, followed by HCl) and 3 mL of HF to each vessel.
4. Digest samples at 80% power for 20 minutes.
5. Add 20 mL of 4% boric acid (w/v) to each sample.
6. Digest samples again at 80% power for 10 minutes.
7. Add 5 mL of HCl.
8. Digest at 100% power for 5 minutes.
9. Cool the samples and adjust the volume to 50 mL with DI water.

DISCUSSION

  • The addition of boric acid aids in the re-solubilization of insoluble fluorides and neutralizes residual hydrofluoric acid (HF). This step is crucial for sample dissolution and minimizing analyte loss during digestion.
  • Following the digestion process, the samples were slightly yellow and visibly clear, indicating that the majority sample matrix had dissolved.

OREAS 700 was prepared from skarn tungsten-magnetite ore from the White Rock W-Sn deposit located in NSW, Australia with the addition of a minor quantity of Cu-Au concentrate. OREAS 700; Tungsten Copper Gold Magnetite Ore; Certificate of Analysis OREAS, Ore Research & Exploration Pty Ltd; Victoria, Australia (July 2014) Retrieved from: www.oreas.com/

Results

Tungsten-Copper-Gold-Magnetite Ore OREAS 700

Method:

0.25g – Add 20mL aqua regia + 3mL HF and digest at 80% power for 20 minutes. Add 20mL of 4% boric acid w/v and digest again at 80% power for 10 minutes.
Add 5mL HCl, and digest again for 5 minutes. Let cool, and adjust the volume to 50mL with DI water.

Element

OREAS Certified Values

ColdBlock Average

ColdBlock SD +/–

ColdBlock RSD

Recovery vs Certified Value

Al (%)

5.57

5.46

0.06

1.2%

98%

As (ppm)

4.35

<5

N/A

N/A

N/A

Ba (ppm)

158

152

1.81

1.2%

96%

Ca (%)

5.55

5.50

0.10

1.8%

99%

Co (ppm)

16.8

17.4

0.53

3.0%

104%

Cr (ppm)

47.2

47.2

0.42

0.9%

100%

Cu (%)

0.202

0.203

0.003

1.5%

100%

Fe (%)

15.57

15.55

0.14

0.9%

100%

K (%)

1.57

1.53

0.008

0.5%

97%

Li (ppm)

223

217

2.87

1.3%

97%

Mg (%)

0.995

0.990

0.008

0.8%

99%

Mn (%)

0.314

0.306

0.004

1.3%

97%

Mo (ppm)

81

81

3.25

4.0%

100%

Na (%)

1.21

1.16

0.02

1.7%

96%

Ni (ppm)

24.1

27.0

2.14

7.9%

112%

P (%)

0.347

0.341

0.005

1.5%

98%

Pb (ppm)

6.83

<10

N/A

N/A

N/A

S (%)

0.295

0.301

0.002

0.7%

102%

Sb (ppm)

0.7

<10

N/A

N/A

N/A

Sn (ppm)

133

129

2.29

1.8%

97%

Sr (ppm)

124

120

1.33

1.1%

97%

Ti (%)

0.179

0.168

0.002

1.2%

94%

V (ppm)

62

65

0.88

1.4%

105%

W (%)

0.989

1.027

0.103

10.0%

104%

Zn (ppm)

216

220

3.34

1.5%

102%

Zr (ppm)

47.3

50.1

0.43

0.9%

106%

Click here to download the Application Note in PDF format.

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