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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

  1. Chiller temperature was set to -5°C
  2. 0.5g of each sample was weighed and placed into a ColdBlock Digestion vessel
  3. 15 mL of HNO3+ 2mL H2O2 was added
  4. Sample was digested at 70% power for 10 minutes
  5. 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

Low

High

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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info@coldblock.ca.