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APPLICATION NOTE

OREAS 750 – Pegmatite, Lithium Ore

SUMMARY

The application note summarizes the digestion of OREAS 750, a Pegmatite Certified Reference Material using ColdBlock Digestion Pro Series Technology.
Instrument:ColdBlock CBM sample digester, chiller, HF compatible liners, ICP-MS & ICP-OES
Published:January 2023
Digestion Time:30 Minutes
Acid Used:Aqua Regia, HF & H3BO3
Average ColdBlock Recovery vs. CRM:

  • 99% Lithium

  • 110% Caesium

  • 114% Tantalum

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 of Aqua Regia + 4 mL HF was added
  4. Sample was digested at 80% power for 20 minutes
  5. 20mL of 4% v/v Boric 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 + 0.5% HClv/v

DISCUSSION

  • The addition of Boric acid will help re-solubilize any insoluble fluorides and will help neutralize any remaining HF in solution
  • Samples appeared mostly clear at the end of the digestion; a minor amount of material settled on the bottom of the tube after bulk up

OREAS 750

This material was prepared from a blend of RC drill chip supplied from Core Lithium’s Finniss Lithium project in Northern Territory, Australia.

OREAS 750; Pegmatite, Lithium Ore; Ore Research & Exploration; Melbourne, Australia (July,2020)

Results

OREA 750

Method:

0.25g

20mL Aqua Regia + 4mL HF, 80% 20 minutes – add 20mL 4% w/v Boric acid, 80% 10 minutes

Element

Certified Value (ppm)

+/-

95% Confidence Limits

Sample A

Sample B

Sample C

Average (ppm)

Stdev

% RSD

% Recovery

Low

High

Ag

0.117

N/A

N/A

N/A

0.121

0.123

0.09

0.111

0.0

16.62%

95%

Al

54200

2700

51500

56900

55810

54485

53989

54761

941.4

1.72%

101%

As

13.3

0.6

12.7

14

12.8

13.7

12.5

13.0

0.6

4.79%

98%

Ba

432

22

410

453

437

432

446

438

7.4

1.68%

101%

Be

37.6

1.9

35.7

39.5

36.0

36.3

38.2

36.9

1.2

3.29%

98%

Bi

1

0.05

0.95

1.05

1.12

1.11

1.02

1

0.1

5.08%

108%

Ca

8280

410

7870

8700

8401

8370

8281

8351

62.5

0.75%

101%

Cd

0.58

0.03

0.55

0.61

0.59

0.59

0.6

0.59

0.01

0.97%

102%

Ce

33.2

1.7

31.5

34.9

26.6

26.6

28.5

27.2

1.1

4.15%

82%

Co

3.99

0.2

3.79

4.18

4.21

4.07

3.94

4.07

0.1

3.31%

102%

Cr

27.6

1.4

26.2

29

32.4

32.6

33.0

32.7

0.3

0.94%

118%

Cs

22.6

1.1

21.5

23.7

24.98

24.35

25.35

24.9

0.5

2.03%

110%

Cu

20.4

1.1

19.3

21.4

22.7

21.8

20.8

21.8

0.9

4.32%

107%

Fe

16700

800

15900

17500

16906

16826

16888

16874

41.9

0.25%

101%

Ga

13

0.7

12.3

13.6

N/A

14

13

13

0.4

3.17%

103%

Hf

1.34

0.07

1.27

1.41

1.29

1.26

1.29

1.28

0.02

1.35%

96%

K

16900

800

16100

17800

17250

17268

17081

17200

103.3

0.60%

102%

La

15.7

0.8

14.9

16.5

12.7

13.1

13.3

13.0

0.3

2.29%

83%

Li

2320

120

2200

2430

2300

2292

2307

2300

7.6

0.33%

99%

Mg

3150

 

0.299

0.331

3433

3355

3306

3365

64.3

1.91%

107%

Mn

380

10

370

400

384

378

378

380

3.2

0.83%

100%

Mo

2.17

0.11

2.06

2.28

2.42

2.09

2.04

2.18

0.2

9.46%

101%

Na

15300

800

14500

16100

16381

15830

15486

15899

451.1

2.84%

104%

Nb

21.3

1.1

20.2

22.4

21.04

20.91

20.5

20.8

0.3

1.35%

98%

Ni

11.4

0.6

10.8

12

13.26

12.55

12.18

12.7

0.5

4.33%

111%

P

700

40

660

730

689

648

588

642

50.6

7.89%

92%

Pb

13.8

0.7

13.1

14.5

14.7

13.9

14.6

14.4

0.4

3.03%

104%

Rb

254

12

242

267

267

262

258

262

4.6

1.74%

103%

**Si

368700

N/A

N/A

N/A

356104

338370

345435

346636

8927.8

2.58%

94%

Sb

0.42

0.02

0.4

0.44

<0.5

<0.5

<0.5

N/A

N/A

N/A

N/A

Sn

25.2

1.2

24

26.5

27.51

23.30

24.89

25.2

2.1

8.42%

100%

OREA 750

Method:

0.25g

20mL Aqua Regia + 4mL HF, 80% 20 minutes – add 20mL 4% w/v Boric acid, 80% 10 minutes

Element

Certified Value (ppm)

+/-

95% Confidence Limits

Sample A

Sample B

Sample C

Average (ppm)

Stdev

% RSD

% Recovery

Low

High

Sr

74

4

70

78

77.57

76.33

75.21

76

1.2

1.55%

103%

Ta

9.78

0.49

9.29

10.27

11.78

10.78

10.92

11.16

0.5

4.85%

114%

Th

6.71

0.34

6.37

7.05

6.57

6.44

6.51

6.51

0.1

1.00%

97%

Ti

1580

80

1500

1660

1565

1486

1515

1522

40.1

2.64%

96%

Tl

1.45

0.07

1.38

1.52

1.78

1.82

1.81

1.80

0.02

1.15%

124%

U

4.24

0.21

4.03

4.45

4.33

4.31

4.34

4.33

0.02

0.35%

102%

V

26.4

1.3

25.1

27.7

25.8

25.4

24.8

25.4

0.5

1.98%

96%

W

5.46

0.28

5.18

5.73

5.72

5.49

5.27

5.49

0.2

4.10%

101%

Y

7.26

0.37

6.89

7.62

6.87

6.23

6.71

6.60

0.3

5.04%

91%

Zn

65

4

61

68

65.64

65.11

63.89

65

0.9

1.38%

100%

Zr

31.3

1.6

29.7

32.9

32.73

31.63

30.86

31.7

0.9

2.96%

101%
**Represents elements certified by Peroxide Fusion (no 4-acid data available)

Click here to download the Application Note in PDF format.

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