Processing method: Compounds: Identification: Compound Table
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Processing method: Compounds: Identification: Compound Table

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.

See Also

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