APPLICATION NOTE

Copper Concentrate – AMIS 0566

SUMMARY

The application note summarizes the digestion of AMIS 0566, a Copper Concentrate Certified Reference Material using ColdBlock Pro Series CBM Technology.

Instrument:ColdBlock CBM sample digester, chiller, HF compatible liners, ICP-MS & ICP-OES
Published:January 2023
Digestion Time:30 Minutes
Acid Used:Reverse Aqua Regia, HF & H3BO3
Average ColdBlock Recovery vs. CRM:
  • 99% Arsenic
  • 98% Bismuth
  • 99% Copper
  • 99% Selenium

METHODOLOGY

  1. Chiller temperature was set to -5°C
  2. 0.25g of each sample was weighed and placed into a ColdBlock™ Digestion vessel
  3. 20 mL reverse Aqua Regia + 3 mL HF was added
  4. Samples were digested at 80% power for 20 minutes
  5. 20mL of 4%v/vBoric acid was added
  6. Samples were digested again at 80% power for 10 minutes
  7. Samples were cooled and bulked to 50mL using 2% HNO3 + 5% HClv/v

DISCUSSION

  • The addition of Boric acid will help re-solubilize any insoluble fluorides and will help neutralize any remaining HF in solution
  • If Silver precipitates out of solution as AgCl, bulk up with >20% HCl v/v
  • If the Sulfide content of your sample is > 10 % – reverse the ratios of Aqua Regia and use 1:3, HCl:HNO3 – always add the Nitric acid first (reddish brown NO2 fumes might form)

AMIS 0566 after bulk-up

The Didipio Gold-Copper Project is in the north of Luzon Island in the Philippines.
The deposit lies within the Dinkidi stock in the Didipio Igneous Complex, a massive alkalic intrusive body. Regionally, the geology consists of late Miocene aged volcanic, volcaniclastic, intrusive and sedimentary rocks that are hosted above a sequence of pre-tertiary aged tonalite and schist.
amis.co.za
AMIS0566; Copper concentrate from the Philippines; AMIS Matrix Reference Materials; A part of Torre Industries: Gauteng, South Africa

Results

AMIS 0566 – Copper Concentrate

Method:

.25g

20mL reverse Aqua Regia + 3 mL HF digested at 80% for 20 minutes, add 20mL of 4% Boric Acid – and digest again at 80% for another 10 minutes

Element

AMIS

Certified 4-acid Value

(ppm)

95% Confidence Limits

Sample A

Sample B

Sample C

Average (ppm)

Stdev

% RSD

% Recovery vs 4-acid value

Low

High

Ag

77

69

85

74

80

76

76.7

2.26

2.9%

100%

Al

16100

15100

17100

15687

15339

15593

15539.7

146.99

0.9%

97%

As

67

56

78

69

64

66

66.2

1.86

2.8%

99%

Ba

237

186

288

250

238

236

241.4

5.89

2.4%

102%

Bi

46

41

51

46

45

45

45.2

0.59

1.3%

98%

Ca

6263

5836

6690

6135

6078

6022

6078.2

46.33

0.8%

97%

Cd

2

1.9

2.1

2

2

2

2.2

0.17

7.6%

112%

Ce

5

4

6

5

5

5

5.3

0.09

1.8%

105%

Co

48

41

55

48

45

45

45.9

1.46

3.2%

96%

Cu

217100

207100

227100

215457

212850

218439

215581.8

2283.63

1.1%

99%

Ga

4

3

5

4

4

4

3.8

0.05

1.2%

96%

In

1

1

1

1

1

1

1

0.00

0.3%

102%

K

8498

8226

8770

8350

8072

8390

8270.7

141.44

1.7%

97%

La

2

1

3

2

2

2

2.2

0.05

2.1%

112%

Mg

5077

4421

5733

5107

5063

5063

5077.5

20.66

0.4%

100%

Mn

151

129

173

153

147

151

150.3

2.62

1.7%

100%

Mo

87

78

96

91

92

93

92.1

1.15

1.3%

106%

Na

5941

5643

6239

6290

6155

6223

6222.7

55.11

0.9%

105%

Pb

242

214

270

239

239

232

236.7

3.30

1.4%

98%

Rb

14

11

17

15

15

15

14.9

0.20

1.3%

107%

*S

249400

231400

267400

249251

249396

242570

247072.4

3184.03

1.3%

99%

Se

422

318

526

426

405

417

416.1

8.39

2.0%

99%

AMIS 0566 – Copper Concentrate

Method:

.25g

20mL reverse Aqua Regia + 3 mL HF digested at 80% for 20 minutes, add 20mL of 4% Boric Acid – and digest again at 80% for another 10 minutes

Element

AMIS Certified 4-acid Value (ppm)

95% Confidence Limits

Sample A

Sample B

Sample C

Average (ppm)

Stdev

% RSD

% Recovery vs 4-acid value

Low

High

Sb

9

8.6

9.4

10

9

9

9.6

0.31

3.2%

106%

Sr

102

87

117

101

101

108

103.4

3.40

3.3%

101%

Te

41

36

46

40

42

41

41.2

0.85

2.1%

100%

Th

1

1

1

1

1

1

1

0.04

3.8%

99%

V

76

71

81

79

74

73

75.3

2.89

3.8%

99%

Y

2

2

2

2

2

2

2

0.05

2.4%

98%

Zn

251

230

272

254

242

251

248.7

5.22

2.1%

99%

* Element certified by Combustion/LECO

Click here to download the Application Note in PDF format.

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