Micromeritics TRISTAR II PLUS Operator's Manual page 129

V V
IEW THE ALIDATION
The Validation report shows whether the data collected during an analysis are within typical
ranges. Select the types of reports to include by selecting the report in the Validation Report
Options window.
When a selected report is generated, if errors occur, a message is displayed across the top
portion of the report and a unique symbol displays on the graph.
I I
NSPECT THE SOTHERM
Evaluation of data should begin with a visual inspection of the isotherm plot. The plot should be
composed of data which have not been subjected to mathematical smoothing as far as possible. If
the data describe a Type I isotherm, then the plot is best shown on a logarithmic pressure axis so
that details of the low pressure region are revealed. Data in this region are important particularly
for micropore studies. Examine the plot to determine if any points are outliers or if a region of the
isotherm exhibits characteristics (spikes, steps, etc.) which are inconsistent with the physical
process being monitored. The philosophical question of whether or not these suspected
extraneous data points should be removed from the raw data is not considered here, but it may be
appropriate to exclude an outlier from reduced data. Too many outliers can cause the integrity of
the total data set to come under suspicion.
Examine specific reported values to confirm that the isotherm data were collected under
reasonable conditions and using reasonable parameters. For example, confirm that the free
space values reported are typical for the sample holder and bath in use. A problem with either
ambient or analysis free space values may indicate a free space measurement error and affect all
calculations of quantity adsorbed.
TriStar II Plus Operator Manual
303-42800-01 (Rev M ) — Sep 2023
R
EPORT
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Evaluate Report Results
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