Climate change effects such as ocean acidification OA are known to affect the trace metal distribution. This experimental study provides the first data on 209 Po uptake rates and 210 Po concentration in five microalgae species under different pH scenarios. The experiment was conducted in replicates at three pH conditions 8.2, 8.0, and 7.5, representing the current and future climate change scenario as per IPCC RCP8.5. ...