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APPLICATION NOTE

Qotho CRM-1-232 – Ferrochrome

SUMMARY

The application note summarizes the digestion of QCRM-1-232 a Ferrochrome Certified Reference Material using ColdBlock™ Digestion Pro Series Technology.

Instrument: ColdBlock CBM sample digester, chiller, HF inserts, ICP-OES
Published: March 2026
Digestion Time: 95.5 Minutes
Acid Used: H2SO4, HNO3, HF, HF
Average ColdBlock Recovery vs. CRM:
  • 99% Chromium
  • 101% Manganese
  • 105% Vanadium

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METHODOLOGY

  1. The chiller temperature was set to -5 °C.
  2. Approximately 0.100 g of each sample was accurately weighed and transferred into a ColdBlock digestion vessel.
  3. A reagent mixture of 20 mL 5 % H2SO4 v/v and 2 mL HF was added to each vessel.
  4. Samples were digested at 100 % power for 5 minutes, followed by 40% power for 80 minutes.
  5. An additional 5 mL HNO3 was introduced to each vessel.
  6. Samples were further digested at 40 % power for 10 minutes, followed by 100 % power for 30 seconds.
  7. Digestates were allowed to cool, then quantitatively diluted to a final volume of 50mL using a solution of 2 % HNO3 v/v.

DISCUSSION

  • An optional addition of boric acid (20mL of 4% v/v H3BO3) can be used to complex residual fluoride ions, which stabilizes the solution and enables safe analysis on sample introduction systems that are not equipped with inert HF kits.

Results

QCRM-1-232 – Ferrochrome Powder

Element 

Certified Value (wt.%)

+/-

Sample A

Sample B

Sample C

Averag (wt.%)

Stdev 

RSD 

Recovery

Al

0.09

0.02

0.08

0.09

0.10

0.09

0.007

8.1%

98%

Co

0.058

0.002

0.056

0.058

0.057

0.057

0.001

1.6%

98%

Cr

48.74

0.10

48.60

48.11

48.22

48.31

0.26

0.5%

99%

Fe

38.21

0.18

39.20

39.80

39.25

39.42

0.33

0.8%

103%

Mg

0.04

0.02

0.04

0.04

0.04

0.04

0.001

2.1%

101%

Mn

0.257

0.004

0.26

0.26

0.26

0.26

0.004

1.4%

101%

Ni

0.173

0.002

0.18

0.18

0.18

0.18

0.003

1.6%

103%

Si

4.36

0.06

4.37

4.33

4.18

4.29

0.102

2.4%

98%

Ti

0.55

0.01

0.55

0.56

0.56

0.56

0.01

1.0%

101%

V

0.35

0.01

0.36

0.37

0.37

0.37

0.005

0.01

105%

Qotho Minerals (Pty) Ltd (2022). QCRM‑1‑232 Ferrochrome Certified Reference Material, Certificate of Analysis. South Africa.

Click here to download the Application Note in PDF format.

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