Difference Method Report Options for Chemical Adsorption

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The Difference Method Report and the Sinfelt Method Report windows are identical unless otherwise specified.

The y-intercept quantity adsorbed (Q0) is used for several calculations in the Difference and Sinfelt reports. This value can be determined in two ways. If one point is selected, Q0 is the quantity adsorbed for that point.

Difference Method. The repeat isotherm data are subtracted from the primary isotherm. Q0 is the y-intercept of a straight line through the difference data.

Sinfelt Method. Both the primary and repeat isotherms are fitted to a straight line. Q0 is the difference between the y-intercepts of the fit lines.

Difference and Sinfelt Report Options Fields and Buttons Table
Field or Button Description
Analysis summary [selection]

Analysis. Generates a summary of the following for the first analysis:

  • Percent metal dispersion
  • Metallic surface area
  • Volume adsorbed
  • Slope
  • Correlation coefficient

Difference. Generates a summary of the differences between the following information for the first and repeat analyses:

  • Percent metal dispersion
  • Metallic surface area
  • Average difference volume

Repeat. (Sinfelt report only). Generates a line fit plot for the secondary analysis.

Pressures [button]

Use to enter a range of pressure points to be included in the report or to modify table values for pressure points.

Calculation pressure range. Enter the minimum and maximum pressures to be used in the pressure table.

Exclude All. Select to exclude all pressure points in the table.

Include All. Select to include all pressure points in the table.

Line fit pressure range.  Enter the minimum and maximum pressures for line fit.

Plot data [selection]

Analysis. Includes a line fit plot for the primary analysis.

Autoscale x-axis / Autoscale y-axis. Select to have the x‑ and/or y‑ axes automatically scaled. The application uses the highest values collected during analysis as the ending points for an axis range. x‑axis shows the pressure. y‑axis shows the quantity of gas adsorbed.

Difference. Plots the difference between the analysis and repeat analysis lines.

Overlay samples. Overlays data from the current sample with that of other samples. Click Overlays on the Report Options window to choose other sample files.

Plot curve and Plot points. Use to specify how to plot data. Plot data as a curve, points, or both.

Repeat. Includes a line fit plot for the secondary analysis.

Tabular report [selection]

Select to have a report of the pressure points generated.

  For fields and buttons not listed in this table, see Common Fields and Buttons.
 
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