Natural lake water (LW) from the Lac-St.-Jean (latitude 48.4666,
longitude −71.8180; QC, Canada) was obtained, sampled on July 1st
2011, 30 m from the lakeside. All these solutions were filtered (0.2 μm
filters) and stored at 4 °C until further use. Detailed chemical analyses
of each solution are provided as Supplementary material.