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Zalieckienė, Elena

doi:10.3846/1060-s

Cited by 1 publication

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“…Natural organic matter can stabilize and prolong the suspension of nano-TiO 2 in the water column [20], which can potentially increase its phototoxicity to aquatic organisms by lengthening their exposure to nano-TiO 2 . Natural organic matter can also attenuate a certain percentage of UV from the system [21] and quench ROS produced during the photoexcitation of nano-TiO 2 [22], which can both potentially decrease the overall phototoxicity of nano-TiO 2 to aquatic organisms. However, chronic exposure to UV and ROS can degrade NOM [23], which could alter its impact on nano-TiO 2 stability and toxicity.…”

Section: Introductionmentioning

confidence: 99%

Effect of natural organic matter on the photo‐induced toxicity of titanium dioxide nanoparticles

Wormington

Coral

Alloy

et al. 2017

Enviro Toxic and Chemistry

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Nano-titanium dioxide (TiO ) is the most widely used form of nanoparticles in commercial industry and comes in 2 main configurations: rutile and anatase. Rutile TiO is used in ultraviolet (UV) screening applications, whereas anatase TiO crystals have a surface defect that makes them photoreactive. There are numerous reports in the literature of photo-induced toxicity to aquatic organisms following coexposure to anatase nano-TiO and UV. All natural freshwater contains varying amounts of natural organic matter (NOM), which can drive UV attenuation and quench reactive oxygen species (ROS) in aquatic ecosystems. The present research examined how NOM alters the photo-induced toxicity of anatase nano-TiO . Daphnia magna neonates were coexposed to NOM and photoexcited anatase nano-TiO for 48 h. Natural organic matter concentrations as low as 4 mg/L reduced anatase nano-TiO toxicity by nearly 100%. These concentrations of NOM attenuated UV by <10% in the exposure system. However, ROS production measured using a fluorescence assay was significantly reduced in a NOM concentration--dependent manner. Taken together, these data suggest that NOM reduces anatase nano-TiO toxicity via an ROS quenching mechanism and not by attenuation of UV. Environ Toxicol Chem 2017;36:1661-1666. © 2016 SETAC.

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