Quinoa Flour - NRC KINO-1 - ColdBlock Technologies

APPLICATION NOTE

Quinoa Flour – NRC KINO-1

SUMMARY

The application note summarizes the digestion of KINO-1, a Quinoa Flour Certified Reference Material using ColdBlock Digestion Pro Series Technology.

Instrument:	ColdBlock CBM sample digester, chiller & ICP-MS
Published:	March 2023
Digestion Time:	10 Minutes
Acid Used:	HNO₃ & H₂O₂
Average ColdBlock Recovery vs. CRM:	94% Cadmium 114% Lead 99% Selenium

METHODOLOGY

Chiller temperature was set to -5°C
0.5g of each sample was weighed and placed into a ColdBlock Digestion vessel
15 mL of HNO3+ 2mL H2O2 was added
Sample was digested at 70% power for 10 minutes
Samples were cooled and bulked to 40mL using 2% HNO3 + 0.5% HCl v/v

DISCUSSION

Samples were mostly clear after digestion – no visible material remains
Samples were filtered prior to analysis

KINO-1 is a Certified Reference Material prepared at the National Research Council Canada (NRC). The source of material was food-grade quinoa flour from Northern Quinoa Production Corporation (Saskatoon, SK, Canada)

KINO-1; Quinoa Flour; Certified Reference Material; National Research Council Canada; Ottawa, Ontario Canada (November 2018)

Results

NRC KINO-1 (Quinoa Flour)
Method:	0.5g	15mL HNO3 + 2mL H2O2 Digest at 60% power for 10 minutes.
Element	Reference Value (mg/kg)	95% Confidence Limits		Sample A	Sample B	Sample C	Average (ppm)	Stdev	% RSD	% Recovery
Element	Reference Value (mg/kg)	Low	High	Sample A	Sample B	Sample C	Average (ppm)	Stdev	% RSD	% Recovery
As	0.001	0.00062	0.00138	<	<	<	N/A	N/A	N/A	N/A
*Ca	720	620	820	705	759	662	708	39.75	5.6%	98%
Cd	0.063	0.057	0.069	0.062	0.060	0.057	0.060	0.002	3.4%	95%
Fe	84.1	81.5	86.7	88	86	85	86.5	1.40	1.6%	103%
Hg	0.00097	0.00071	0.00123	<	<	<	N/A	N/A	N/A	N/A
*K	6010	5290	6730	5639	6000	6168	5936	220.60	3.7%	99%
*Mg	1970	1670	2270	1981.458	1946.288	1945.26	1958	16.83	0.9%	99%
*Na	37	29	45	40	37	36	37	1.70	4.5%	101%
Pb	0.0028	0.002	0.0036	<	<	<	N/A	N/A	N/A	N/A
Se	0.17	0.15	0.19	0.18	0.17	0.13	0.16	0.02	12.1%	94%
Sr	2.49	2.31	2.67	2.43	2.36	2.36	2.36	0.03	1.4%	95%
Zn	30.6	29.8	31.4	36.074	33.274	29.087	32.8	2.87	8.8%	107%

Click here to download the Application Note in PDF format.

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