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We derived Potassium abundances in red giant branch stars in the Galacticglobular clusters NGC104 (144 stars), NGC6752 (134 stars) and NGC6809 (151stars) using high-resolution spectra collected with FLAMES at the ESO - VeryLarge Telescope. In the considered samples we do not find significant intrinsicspreads in [K/Fe] (confirming the previous findings by Carretta et al.), atvariance with the cases of the massive clusters NGC2419 and NGC2808.Additionally, marginally significant [K/Fe]-[O/Fe] anti-correlations are foundin NGC104 and NGC6809, and [K/Fe]-[Na/Fe] correlations are found in NGC104 andNGC6752. No evidence of [K/Fe]-[Mg/Fe] anti-correlation are found. The resultsof our analysis are consistent with a scenario in which the process leading tothe multi-populations in globular clusters implies also enrichment in the Kabundance, the amplitude of the associated [K/Fe] enhancement becomingmeasurable only in stars showing the most extreme effects of O and Mgdepletion. Stars enhanced in [K/Fe] have been found so far only in clustersharbouring some Mg-poor stars, while the other globulars, without a Mg-poorsub-population, show small or null [K/Fe] spreads.

The Potassium abundance in the globular clusters NGC104, NGC6752 and NGC6809