Displaying and Using I-t Plots
Displaying Difference, 1st Derivative, or 2nd Derivative I-t Plots

When two or more I-t plots are displayed in the integration window, the similarity of the plots is often of interest. Chromeleon can analyze the I-t plots and display a difference I-t plot, or a first or second derivative I-t plot of each displayed plot.

1. Select Decoration on the View or context menu.

2. Select the Analysis tab and select the desired analysis option.

The Difference option displays a plot of the difference between the main I-t plot and the other I-t plots currently displayed. The main I-t plot is determined as follows:

• If the peak I-t plot extracted at the retention time is displayed, it is the main I-t plot.

• If the retention time plot is not displayed and I-t plots were selected with the Spectra/I-t Plots tool, the main I-t plot is the first plot selected.

• If the retention time plot is not displayed and I-t plots were extracted automatically at different peak heights, the main plot is the I-t plot with the oldest retention time.

The 1st derivative option displays the first derivative of each I-t plot displayed.

The 2nd derivative option displays the second derivative of each I-t plot displayed.

Also, refer to:

Displaying Peak I-t Plots

Displaying and Overlaying Time I-t Plots