2.6.1 Determination method
See Supporting Information for the determination of microbubble size and
microbubble-algal size. The content of chlorophyll a was determined by
spectrophotometry.
Algal recovery (%) = (C1-C2) /C1*100
C1: Chla concentration before air flotation (since the ratio of algal
water to dissolved air water is 1:2, the Chla concentration before air
flotation is 1/3 of the Chla concentration of the original water
sample); C2: Chla concentration after air flotation.