Metrohm Vision – Tutorial - Manual (Page 21)

 4 Qualitative Model Development
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 NIRS Vision Tutorial – Operation
Save Results
1. Click on Identify  Save Results
2. If asked “Save identify method #1 as library global identify
method?” click on [YES]
1.4 Qualifying a Product
The 3 stearate products are ambiguous.
A Qualification Method is used to determine how similar a sample is it to what
has been accepted in the past. It can also be used to distinguish very similar
products, e. g. Stearates.
Create a Qualification Method
1. Click on Mode  Qualitative Analysis  Qualify Method
Development.
The currently selected library appears next to a red cuvette in the
Samples View.
2. Double click on the xdslib library
all products are listed under the selected library.
3. Double-click on the “Calcium Stearate”
The cuvette turns gray, indicating that the product has been selected.
NOTE: the cuvette must turn gray before the math can be applied.
4. Click on Select  Apply Math.
5. In the Edit Qualify Method dialog box apply or confirm the following
settings:
 Method Maximum Distance in Wavelength Space
 Pre Treatment Method 2nd derivative
 Threshold type = Match value value = 3
 Library Stabilization 1
 Click on [OK]
6. In the Edit Math Properties dialog box in the wavelength distance tab
set the following wavelength regions:
 Region 1
Minimum: 1870
Maximum: 2000
 Click on [OK]