- ACQUITY UPLC PDA Detector
See the Empower PDA Software Getting Started Guide, page 50.
"Ensure that the absorbance of all peaks in the chromatogram is less than 1 AU (absorbance unit). This criterion is necessary when calculating purity results in order for these results to be valid. If the absorbance is less than 1 AU, proceed with the next step. If the absorbance of any peak is greater than 1 AU, dilute the sample appropriately and acquire it again.