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Insight into chronic exposure effects of nanosized titanium dioxide on Typha angustifolia leaf litter decomposition

Zhang, Yuyan, Yin, Yuting, Ma, Hang, Cao, Xinshuai, Ma, Bingbing, Qv, Mingxiang, Zhang, Baozhong, Akbar, Siddiq, Du, Jingjing
Chemosphere 2019 v.224 pp. 680-688
Typha angustifolia, biochemical pathways, chronic exposure, ecotoxicology, freshwater, freshwater ecosystems, fungal biomass, leaves, nanoparticles, plant litter, risk assessment, saprophytes, titanium dioxide
Advancement in nanotechnology has increased production of nanoparticles which initiates concerns for freshwater ecosystems. Nanosized TiO2 is one of the most used materials and its ecotoxicity has been extensively studied. Here, a freshwater microcosm experiment was performed to investigate the effects of nanosized (10, 60, and 100 nm) and bulk TiO2 at 1 g L−1 on the alteration in community structure of fungal decomposers and the consequences on litter decomposition of Typha angustifolia leaves. After 209 days of exposure, the decomposition rate was significantly higher in 100 nm TiO2 treatment compared to the control, which was caused by its promotion on fungal biomass and metabolic activity. Therefore, the study provides the multifaceted evidences for different effects of TiO2 with varied sizes on T. angustifolia leaf decomposition and highlights the importance of understanding the potential effects of varying sizes and long-term exposure in nanoparticle risk assessments.