APPLICATION NOTE

Multi-Nutrient Fertilizer – NIST 695

SUMMARY

The application note summarizes the digestion of NIST 695, a Multi-Nutrient Fertilizer Standard Reference Material using
ColdBlock™ Digestion CB15S Technology.

Instrument:ColdBlock CB15S sample digester, chiller, ICP-OES
Published:September 2022
Digestion Time:20 Minutes
Acid Used:Aqua Regia
Average ColdBlock Recovery vs. CRM:
  • 101% Calcium
  • 100% Potassium
  • 98% Phosphorus

METHODOLOGY

  1. Chiller temperature was set to -5° C
  2. 1.0g of each sample was weighed and placed into a ColdBlock™ Digestion vessel
  3. 40mL of Aqua Regia was added, and mixed with sample
  4. Sample was digested at 80% power for 20 minutes
  5. Sample was cooled and bulked to 50mL using 2% HNO3 v/v

DISCUSSION

  • During the digestion, the samples started climbing up the test tube but fell back down once they hit the cooling zone
  • After 20 minutes of digestion, a trace amount of sample material remains
  • Percent recoveries were calculated using total element content values certified by NIST

Results

NIST 695 – Multi-Nutrient Fertilizer

 

Method:

 

1.0g

 

40mL Aqua Regia – Digest at 80% for 20 minutes

Element

Certified Total Values (ppm)

ColdBlock Average (ppm)

Stdev

%RSD

%

Recovery

As

200

184

0.22

0.1%

92%

Ca

22600

22840

195.73

0.9%

101%

Cd

16.9

15.9

0.04

0.2%

94%

Co

65.3

65.11

0.57

0.9%

100%

Cr

244

228

2.36

1.0%

93%

Cu

1225

1231

9.93

0.8%

100%

K

116200

116020

987.03

0.9%

100%

Mo

20

20

0.08

0.4%

100%

Ni

135

132

0.485

0.4%

98%

P*

72000

70552

506.23

0.7%

98%

Pb

273

278

3.985

1.4%

102%

Zn

3250

3257

21.41

0.7%

100%

Click here to download the Application Note in PDF format.

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