DHA Results
The DHA Results section on the DHA tab contains information about the detected compounds and calculated results.
Chromatogram window - DHA - DHA Results
Above the table, you can see information about the signal from which the results were calculated, and also the selected norm. To obtain valid data, you must create a calibration first using Create DHA Calibration. The calibration must use the same norm as selected for displaying the Results. Otherwise, you will see one of the following warnings:
- Linked calibration was not generated by DHA
The Calibration you have linked to the chromatogram was not created using the DHA Extension. Create it using the n-Paraffins known sample via the Create DHA Calibration… button.
- Norm selected for DHA Method <norm name> and DHA Calibration <norm name> do not match
Different norms are selected in DHA Results and DHA Calibration.
- Unretained Peak Time has to be enabled in Calibration
To correct this behavior, you must open the Calibration Options dialog in the linked Calibration and enable the Retention Indexes use Log. Interpolation with Unretainded Peak option.
- Unretained Peak Time in Chromatogram <number> and DHA Calibration <number> do not match
Your linked DHA Calibration was generated with different Unretained Peak Time than what the current DHA Method contains. Correct it in the DHA Settings or create DHA Calibration again with the requested Unretained Peak Time.
- Unretained Peak Time is non-zero
This is an informational message that appears when the Unretained Peak Time is set to a non-zero value.
- DHA Calibration is not linked
Calibration is not linked. You will not see any results until you link a DHA Calibration.
Retention Index of a compound. It is saved in the norm table (the DHA.csv file located in the CLARITY\DatFiles\Common directory).
If the chromatogram contains calibrated peaks or groups, the names are shown in the Compound Name column. The table contains compounds from all signals in the chromatogram.
The hydrocarbon type of the compound retrieved from the selected norm.
Corrected area of a specific compound in the measured chromatogram.
% Area of the a specific compound in the measured chromatogram. The value is based on the corrected area value, which is calculated from the chromatogram peak area multiplied by the relative response factor – meaning that it is in fact based on the compound amount.
% Weight of a specific compound in the measured chromatogram. The value is based on the entire sample amount. It may be corrected for the undetected compounds percentage (like water etc., determined by external methods) entered in the respective field. When this field is non zero, the % Area and % Weight values will differ accordingly.
% Volume of a specific compound in the measured chromatogram. It is calculated as the ratio of (% Weight)/(Relative Density).
A Warning may appear if the compound name is not found in the selected norm. If you can match the present compound with a compound from the norm, click on the Edit Link Table… button. In the displayed window, you can link compounds from the chromatogram with compound names in the norm.