Multi-Nutrient Fertilizer - NIST 695 - ColdBlock Technologies

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

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% HNO_{3 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.