Figure 8: Normalized specific chlorophyll () for three-NP samples. Circles are SiO2, triangles are Al2O3, and squares are TiO2. Solid symbols are 100 mg/L of exposure dosage. Closed symbols are 1000 mg/L of exposure dosage. Experimental conditions: initial algae concentration =  cell/mL, test duration = 4 days, and initial test volume = 200 mL.