Sample Analysis - CEM ORACLE Operation Manual

Sample Analysis

Proper product sampling and preparation are critical to achieving optimal accuracy and precision using an ORACLE.
Each sample has a unique composition, and therefore may require a unique preparation and application process.
Listed below guidelines to optimize every analysis.
Sampling
o Proper sampling of any product type is necessary for a rapid analysis that accurately represents the
entire production batch or line. Many standard procedures have been developed specific to each
sample type by various agencies such as AOAC, USDA, or ASTM. Please reference each agency for
the correct procedure before moving forward with analysis on an ORACLE.
Preparation
o Sample preparation should be practiced to ensure a homogenous sample is being analyzed. As with
any chemical analysis, a homogenous sample leads to a more representative test, and better results
when comparing duplicate results or reference chemistry.
o Sample preparation can entail physical or chemical changes to the sample to improve analysis. If
using a SMART 6, please contact the CEM Corporation Process Application group, or review the
method note for the sample found at www.cem.com/SMART_6/resource_library.
Weight
o Consistent sample weight helps ensure precision and accuracy. While sample size can vary from 1.0
grams to 5.0 grams depending on the type of product being tested, repeatability within the same
sample is important to avoid burning or under-drying of a sample. All moisture methods, either
using a SMART 6 or a reference analysis, List an acceptable weight range that should be followed for
every analysis to optimize results.
Glass Fiber Pads
o The ORACLE uses CEM certified glass fiber sample pads to assist in rapid and accurate testing. The
pads are specially designed to support the sample being tested without absorbing heat, but
remaining porous enough to let moisture freely evaporate.
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Trac Film
o Every sample analyzed in the ORACLE must be wrapped in the proprietary Trac Film. The film
ensures that no sample is lost during the sample preparation procedure outlined in the ORACLE
Station Sample Prep section, as well as protects the ORACLE tubes from incurring buildup of fat or
oil over time.
o The film was developed specifically for this purpose, and is manufactured with materials that will
not interfere with the NMR process. Not using the Trac Film can lead to inaccurate results, as well as
a voidance of the system's warranty or service contract.
Application
o Also known as the sample spread technique, the application of a sample to the glass fiber sample
pads is equally important in achieving optimal results. If using an Air Oven for initial drying and
moisture analysis, follow the instructions provided in that techniques Standard Operating
Liquid samples (typically above 25% moisture) typically use 2 glass fiber sample pads to help
retain heat in the sample and avoid splattering during the heating process.
Dry samples (typically under 25% moisture) only require a single glass fiber sample pad for
the analysis.
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