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: |
|
METHODOLOGY
- Chiller temperature was set to -5° C
- 1.0g of each sample was weighed and placed into a ColdBlock™ Digestion vessel
- 40mL of Aqua Regia was added, and mixed with sample
- Sample was digested at 80% power for 20 minutes
- 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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ColdBlock Technologies Inc.
4551 Zimmerman Ave
Niagara Falls, ON L2E 3M5
info@coldblock.ca.