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APPLICATION NOTE

Fertilizer – 20-20-20 (P-K-N)

SUMMARY

The application note summarizes the digestion of a 20-20-20 (P-K-N) Fertilizer using ColdBlock Digestion CB15S Technology.

Instrument: ColdBlock CB12L sample digester, chiller, ICP-OES
Published: September 2022
Digestion Time: 10 Minutes
Acid Used: HNO3 & HCl
Average ColdBlock Recovery vs. CRM:
  • 100% Iron
  • 110% Phosphorus
  • 97% Potassium

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. 10mL HCl + 10mL HNO3 was added
  4. Sample was digested at 80% power for 10 minutes
  5. Sample was cooled and bulked to 50mL using Ultrapure water

DISCUSSION

  • After 20 minutes the samples were clear, and no visible sample material remains
  • Sample material climbed the test tube during the digestion but fell back down with the condensation effectproduced by the cooling zone

Results

20-20-20 (P-K-N) Fertlizer

Method:

0.5g

10mL HCl + 10mL HNO3- Digest at 80% for 10 minutes.

Element

Reference Values (wt.%)

ColdBlock Average (wt.%)

Stdev

% RSD

% Recovery

B

0.02

0.02

0.0005

2.3%

108%

Cu

0.05

0.05

0.0015

3.0%

100%

Fe

0.1

0.1

0.005

5.0%

100%

K2O

20

19.5

0.05

0.3%

98%

Mn

0.05

0.05

0.0025

5.0%

100%

P2O5

20

22

0.37

1.7%

110%

Zn

0.05

0.05

0.0001

0.2%

100%

Click here to download the Application Note in PDF format.

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