How to calculate Peak to Valley Ratio

This chapter describes how to calculate Peak to Valley, which is a ratio of signal height in peak apex and signal height in the end of peak. This ratio is used for e.g., impurity determination.

  1. Open a chromatogram you want to work with and switch to Results tab.
  2. Add a User Column as described in chapter "User Columns".
  3. Fill the Title for the new column - e.g. P/V Ratio ①.
  4. Uncheck Calculate Total ②.
  5. Enter "[Height]/([End Value (Signal)]-[End Value])" formula to the Expression field ③. You can either use items from Columns: list or type it manually.
  6. Close the dialog by clicking OK.

  1. New P/V Ratio column ④ is displayed in the Result Table.

Note:

Value is only valid for peaks, where peak end is not on the baseline.