This experiment is about the degradation kinetics of a pesticide (acetamiprid) diluted at 10 ppm in water. This degradation is done via a UV lamp to simulate the action of the sun while accelerating the degradation process. The degradation kinetics was performed over 90 minutes in three different tubes (A, B and C) with the following samples for each of them: 0 (reference before photolysis), 1, 2, 5, 10, 30, 60, 90 minutes. The analysis is performed in ultra-high resolution mass spectrometry in positive mode direct injection electrospray using an autosampler. 50 scans are accumulated with a resolution of about 300,000 at m/z 400. Acetamiprid is observed in this study at m/z 223.07 as [MH]+, m/z 245.06 as [MNa]+ and dimers and trimers corresponding to the following m/z: 445.14, 467.12 and 689.19.

1 Using the xy format

1.1 Run the demo

Select the demo acetamiprid (.xy format)

The objective of this study is to see how some peaks of the spectrum evolve over time. The peaks (i.e.ย the m/z values) associated with a significant change are represented. Here, the part of variance explained by the model is represented on the y-axis while the color represents the p-value.

Explore the plotted data by enabling the data cursor mode

Then, select a stem (i.e a \(m/z\)) to plot the fitted model and the measured spectra around the spike