APPLICATION NOTE
Multi-Element – CDN-ME-1709
SUMMARY
The application note summarizes the digestion of CDN-ME-1709, a multi-element 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: |
|
METHODOLOGY
- Chiller temperature was set to -5°C
- 0.25g of each sample was weighed and placed into a ColdBlock™ Digestion vessel
- 20 mL Aqua Regia + 3 mL HF was added
- Sample was digested at 80% power for 20 minutes
- 20mL of 4%v/vBoric acid was added
- Samples were digested again at 80% power for 10 minutes
- 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% HClv/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)
The ore was supplied by Farallon Resources from their Campo Morado property in Mexico.
The Campo Morado precious metal-bearing, volcanogenic massive sulphide deposits occur in a lower Cretaceous bimodal, calc-alkaline volcanic sequence. Most deposits occur in the upper part of a sequence of felsic flows and heterolithic volcanoclastic rocks or at its contact with overlying chert and the Nitric acid first (reddish brown NO2 fumes might form)
argillite.
Gold, silver, zinc, and lead are associated with pyrite, quartz, ankerite, sphalerite, chalcopyrite and galena, with minor tennanite-freibergite, arsenopyrite, and pyrrhotite.
cdnlabs.com
CDN-ME-1709; Multi-Element; CDN Resource Laboratories Ltd; Langley, British Columbia (March, 2018)
Results
|
CDN-ME-1709 |
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|
Method: |
0.25g |
20mL 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 mins |
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|
Element |
CDN Labs Certified |
CDN Labs 95% Confidence Limits |
Sample A |
Sample B |
Sample C |
Average (ppm) |
Stdev |
% RSD |
% Recovery vs 4-acid value |
|
|
Low |
High |
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|
Ag |
11.8 |
10.4 |
13.2 |
12.1 |
13.2 |
12.6 |
12.6 |
0.450 |
3.6% |
107% |
|
Cu |
1380 |
1320 |
1440 |
1262 |
1436 |
1449 |
1382 |
85.01 |
6.1% |
100% |
|
Pb |
530 |
490 |
570 |
554 |
610 |
613 |
592 |
27.13 |
4.6% |
112% |
|
Zn |
1940 |
1820 |
2060 |
1954 |
2009 |
2036 |
2000 |
34.31 |
1.7% |
103% |
Click here to download the Application Note in PDF format.
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