Peak-to-valley ratio

The Peak to valley ratio is a measure of quality, indicating how well the peak is separated from other substance peaks. This user-specified parameter is a constituent of advanced baseline tracking mode. It is used to decide whether two peaks that do not show baseline separation are separated using a drop line or a valley baseline. The integrator calculates the ratio between the baseline-corrected height of the smaller peak and the baseline-corrected height of the valley. When the peak valley ratio is lower than the user-specified value, a drop-line is used; otherwise, a baseline is drawn from the baseline at the start of the first peak to the valley, and from the valley to the baseline at the end of the second peak (compare Baseline correction mode: no penetration with Peak Valley Ratio).

 

Peak Valley Ratio

The peak-to-valley ratio is calculated using the following equations:

H1 ≥ H2, Peak valley ratio = H2/Hv

and

H1 < H2, Peak valley ratio = H1/Hv

Effect of peak valley ratio on the baselines shows how the user-specified value of the peak valley ratio affects the baselines.

 

Effect of peak valley ratio on the baselines