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APPLICATION NOTE

Agromat Compost CP-1, Matrix Reference Material

SUMMARY

The application note summarizes the digestion of AgroMAT Compost CP-1, a Matrix Reference Material using ColdBlock Digestion CB15S Technology.

Instrument:

ColdBlock CB15S sample digester, chiller, ICP-OES, ICP-MS

Published:

August 2022

Digestion Time:

30 Minutes

Acid Used:HNO3 & HCl
Average ColdBlock Recovery vs. CRM:

  • 104% Cadmium

  • 96% Mercury

  • 104% Arsenic

  • 107% Lead

METHODOLOGY

  1. Chiller temperature was set to -5° C
  2. 0.25g of AgroMAT Compost CP-1 was weighed and placed into a ColdBlock™ Digestion vessel
  3. 7ml HNO3 was added, and mixed with sample
  4. Sample was digested at 70% power for 10 minutes
  5. 7mL HCl was added, and sample was digested again at 70% power for 20 minutes
  6. Sample was cooled and bulked to 50mL using 2%HNO3 +0.5% HClv/v

DISCUSSION

  • Upon addition of HNO3, the evolution of reddish brown (NO2) fumes might occur
  • The NO2 subsided and turned white prior to the addition of HCl
  • After 30 minutes the samples are slightly yellow, and a minor amount of solid material remains
  • Longer digestion times can be used to improve the recoveries of certain elements

CP-1 after digestion completed

AgroMAT Compost CP-1 is a Matrix Reference Material used for QC verification and/or method development purposes.

Results

AgroMAT – Compost (CP-1) Results

Method:

0.25g

7mL HNO3 Digest 600 seconds at 70%, add 7mL HCl and digest again at 70% for 1200 seconds

Element

Consensus Value (mg/kg)

Confidence Interval (mg/kg)

ColdBlock Average (mg/kg)

Stdev

% RSD

% Recovery

Al

4579

4262-4896

4300

347.5

8.10%

94%

As

2.24

2.12-2.36

2.41

0.03

1.20%

108%

Ca

18530

18100-18960

18256

184.5

1.00%

99%

Cd

0.719

0.663-0.774

0.75

0.023

3.10%

104%

Co

3

2.84-3.17

3

0.3

9.70%

103%

Cr

16.1

15.0-17.1

16

0.35

2.20%

99%

Cu

76.2

73.5-78.9

76.2

3.965

5.20%

100%

Fe

25547

24526-26568

26496

24.5

0.10%

104%

Hg

0.142

0.126-0.158

0.136

0.001

0.70%

96%

K

2373

2252-2495

2131

3.805

0.20%

90%

Mg

1720

1656-1785

1722

46.535

2.70%

100%

Mn

710

696-725

741

3.65

0.50%

104%

Na

908

–

990

70.15

7.10%

109%

Ni

11.1

10.6-11.7

10.4

1.3

12.50%

94%

Pb

15.6

14.9-16.2

16.7

0.495

3.00%

107%

Se

0.899

0.813-0.984

0.924

0.086

9.30%

103%

Zn

248

242-254

273

0.08

0.03%

110%

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.