Multi-Element - CDN-ME-1709 - ColdBlock Technologies

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:	107% Silver 100% Copper 103% Zinc

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% HCl_v/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
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
Element	CDN Labs Certified 4-acid Value (ppm)	CDN Labs 95% Confidence Limits		Sample A	Sample B	Sample C	Average (ppm)	Stdev	% RSD	% Recovery vs 4-acid value
Element		Low	High	Sample A	Sample B	Sample C	Average (ppm)	Stdev	% RSD	% Recovery vs 4-acid value
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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