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This Standard Reference Material (SRM) is certified as a neat chemical of known purity. It is a primary standard intended for use during calibration procedures and method validations implemented by clinical laboratories.
A unit of SRM 912b consists of 25 g of high-purity crystalline urea.
Certified Urea Mass Fraction: 99.95 % ± 0.01% A NIST certified value is a value for which NIST has the highest confidence in its accuracy in that all known or suspected sources of bias have been investigated or taken into account.
The certified value was determined using a mass balance approach for purity assessment.
The uncertainty was determined as the 95 % coverage interval (U95) of the probability distribution function evaluated using a Bayesian statistical approach implemented via a Markov Chain Monte Carlo method.
The measurand is the total concentration of urea. Metrological traceability is to the SI derived unit for mass fraction (expressed as percent).
Biuret is the primary impurity component [5], followed by water with approximate mass fractions of 0.025 % and 0.015 %, respectively.
| SKU | NIST912b |
|---|---|
| Catalog Number | NIST912b |
| Chemical Name | Urea |
| Storage Condition | For a prolonged period. Keep at 2-8°C in a closed container, away from light and moisture. |
| Shipping Info | All Products are stable to be shipped at room temperature unless otherwise specified. |
NIST is a registered trademark of National Institute of Standards and Technology
SRM is a registered trademark of National Institute of Standards and Technology
All instruments and names of manufacturers mentioned here are the trademarks of their respective companies and are used for reference purposes only. Clinivex Inc. expressly disclaims any affiliation with them
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