Multi-Element - CDN-ME-1805 - ColdBlock Technologies

APPLICATION NOTE

Multi-Element – CDN-ME-1805

SUMMARY

The application note summarizes the digestion of CDN-ME-1805, 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:	Reverse Aqua Regia, HF & H₃BO₃
Average ColdBlock Recovery vs. CRM:	98% Copper 100% Lead 101% 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 of reverse Aqua Regia + 3 mL HF
Sample was digested at 80% power for 20 minutes
20mL of 4%w/v Boric 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% HCl_v/v
If the Sulfide content of your sample is > 10 % – reverse

Standard CDN-ME-1805 was prepared from ore received from Hecla Mining’s Greens Creek deposit.

The Greens Creek deposit is a polymetallic, stratiform, massive sulfide deposit. The host rock consists of predominantly marine sedimentary, and mafic to ultramafic volcanic and plutonic rocks, which have been subjected to multiple periods of deformation.

cdnlabs.com

CDN-ME-1805; Multi-Element; CDN Resource Laboratories Ltd; Langley, British Columbia (June, 2018)

Results

CDN-ME-1709
Method:	0.25g	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	CDN Labs Certified >4-acid Value (ppm)	CDN Labs 95% Confidence Limits		Sample A	Sample B	Sample C	Average (ppm)	Stdev	class=”lblue” % RSD	% >Recovery vs 4-acid value
Element		Low	High	Sample A	Sample B	Sample C	Average (ppm)	Stdev	class=”lblue” % RSD	% >Recovery vs 4-acid value
Ag	2288	2172	2404	2399	2316	2439	2385	51.23	2.1%	104%
Cu	8730	8450	9010	8874	8024	8697	8532	366.34	4.3%	98%
Fe	53000	50000	56000	54647	49618	53375	52547	2134.93	4.1%	99%
Pb	55000	51900	58100	57153	52093	56480	55242	2243.39	4.1%	100%
Zn	105400	102600	108200	109985	100274	109123	106461	4389.02	4.1%	101%

Click here to download the Application Note in PDF format.

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4551 Zimmerman Ave
Niagara Falls, ON L2E 3M5
info@coldblock.ca.