The phrase "to analyze the samples" means to carefully study the specimens or substances to understand their properties, characteristics, or composition. Full definition
To show a true global pH change, you need to analyse samples from all around the world over a lengthy period of time... just as was done with temperature. (judithcurry.com)
So the team used the same procedure as that used to analyse the samples produced for the research. (sciencedaily.com)
The team analysed samples of volcanic glass from the Atlantic, Pacific and Indian oceans that contained traces of seawater that had been deeply cycled throughout Earth's interior. (sciencedaily.com)