Fig. 12
Reprinted with permission from (RSC Advances  2016; 6: 115271–115283). Copyright (2016) Royal Society of Chemistry
Extracellular H2O2 [nM] (c H2O2 ) produced during 60 min by four nano-TiO2 concentrations with (b, d) and without UV pre-treatment (a, c) in abiotic (a, b) and biotic (c, d) conditions in the MOPS buffer: nano-TiO2 only (a), nano-TiO2 after 20 min UV pre-treatment (b), algae exposed to nano-TiO2 (c) and algae exposed to UV pre-treated nano-TiO2 (d). The horizontal red line represents the LOD and insets depict enlargements of the respective 0–1000 nM concentration range