Use ²D relative retention times (RRT ²D)

In addition to the relative retention time in the first dimension (RRT ¹D), you can also use the second dimension for 2D RRT reference compounds. The expected ¹D and ²D retention times of an associated 2D compound are then automatically calculated and used for identification.

Using 1D relative retention times is described in the core Data Analysis help.

For details on how the application calculates the values, see Calculations for relative retention times in 2 dimensions.

Preparations

• To be able to carry out the procedure as described, you need the privilege Processing Method > Edit identification parameters . Privileges are configured in the Control Panel.

• If the project enforces method approval, the method status must be Generic. For details, see Method Approval.

1. In the Processing Method window, select Compounds > Identification .

2. Select the General tab.

3. Select Use 2D compounds as RRT reference compounds.

4. Select the Compound Table tab.

   The columns Is RRT ref., Associated RRT ref., RRT ¹D, and RRT ²D are now visible in the compound table.

5. For each 2D RRT reference compound:

   1. Select the Is RRT ref. check box.
   2. Enter the expected ¹D and ²D RT.

6. For the associated 2D compounds:

   1. Under Associated RRT reference, select the correct reference compound.
   2. Under RRT ¹D, and RRT ²D, enter the RRT value from literature or reference tables.

   The expected ¹D and ²D RT for the associated compound are then automatically calculated and used for identification.

 

NOTE

You can only associate 2D RRT reference compounds with 2D compounds, and 1D RRT reference with 1D compounds.