Processing method: Compounds: Identification: Compound Table

What do you want to do?

• Learn more about the compound table in the core Data Analysis software.

• Evaluation of the retention time window

• Calculations and Background References

In a 2D-LC method, the compound table contains additional and renamed information:

Type	The icon indicates whether it is internal or external standard, a normal or time reference compound. : External standard, two-dimensional compound : External standard, two-dimensional time reference compound : Internal standard, two-dimensional compound or time reference compound
Exp. 1D RT	The retention time in minutes where the compound is expected in the first dimension.
RRT ¹D	Relative retention time (RRT) in the first dimension. You typically enter an RRT value from the literature. The expected ¹D retention time of the compound is then updated. Also vice versa, if you change the expected ¹D retention time, the RRT ¹D value is updated. See Use relative retention times (RRT).
RRT ²D	Relative retention time (RRT) in the second dimension.
Absolute RT Window 1D (min)	The window in minutes around the expected 1D retention time that defines the range in which the compound will be identified in the first dimension.
Relative RT Window 1D (%)	The window in percent (%) around the expected 1D retention time that defines the range in which the compound will be identified in the first dimension.
Exp. 2D RT	The retention time in minutes where the compound is expected in the second dimension. Not editable for 1D compounds.
Absolute RT Window 2D (min)	The window in minutes around the expected 2D retention time that defines the range in which the compound will be identified in the second dimension. Not editable for 1D compounds.
Relative RT Window 2D (%)	The window in percent (%) around the expected 2D retention time that defines the range in which the compound will be identified in the second dimension. Not editable for 1D compounds.
¹D RT update	You can define if and when the system replaces the expected ¹D RT in the method by a corrected ¹D RT. With time references, an additional general factor is used in the formula. For details on the calculation, see Calculations for updated retention times . You can choose between the following modes for updating the expected RT: Never The expected RT is never updated in the method. After each run The expected RT is updated in the method after processing standards or samples. If the compound is missing, its expected RT is not updated. After calibration standards The expected RT is updated in the method only after processing standards.
¹D RT update factor (%)	The extent of correction, used to calculate a corrected ¹D retention time. See ¹D RT Update.
²D RT update	You can define if and when the system replaces the expected ²D RT in the method by a corrected ²D RT. With time references, an additional general factor is used in the formula. For details on the calculation, see Calculations for updated retention times . You can choose between the following modes for updating the expected RT: Never The expected RT is never updated in the method. After each run The expected RT is updated in the method after processing standards or samples. If the compound is missing, its expected RT is not updated. After calibration standards The expected RT is updated in the method only after processing standards.
²D RT update factor (%)	The extent of correction, used to calculate a corrected ²D retention time. See ²D RT Update.