acid transient effects 

in ICP spectrometry
https://doi.org/10.1351/goldbook.08447
Increase in signal equilibration time or in wash out time caused by a modification in inorganic acid concentration.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 712 [Terms] [Paper]