Fig. 6From: Pre-concentration of microalga Euglena gracilis by alkalescent pH treatment and flocculation mechanism of Ca3(PO4)2, Mg3(PO4)2, and derivativesFE of E. gracilis was determined at pH 8.5 with and without EDTA. FE, flocculation efficiency; EDTA, ethylene diamine tetraacetic acid. Control A represents a control group at the CPV without EDTA; Control B represents a control group with added EDTA; NS, ** represent p > 0.05, p < 0.01, respectively. The values represent mean ± S.D. n = 3Back to article page