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• W4283394631 endingPage "156984" @default.
• W4283394631 startingPage "156984" @default.
• W4283394631 abstract "Engineered titanium dioxide (TiO2) nanoparticles (NPs) are widely used and consequently released into the environment. The subsequent accumulation of TiO2 NPs in depositional environments may affect the geochemical behavior of trace metals, which needs to be assessed. Here, we performed experiments to investigate the speciation change for molybdenum and tungsten in the presence of TiO2 NPs. Laboratory results show that the rate constant for MoS42− hydrolysis associated with TiO2 NPs is ~1.75 × 10−9 L m−2 s−1, whereas it is 5.95 × 10−10 L m−2 s−1 for WS42− hydrolysis. In addition, we estimated the maximum rate for MoS42− hydrolysis to be ~1.24 × 10−1 μM hr−1, whereas the maximum rate for WS42− hydrolysis is ~4.91 × 10−2 μM hr−1. However, the modeling results suggest that the TiO2 NPs accumulated in estuarine sediments might play a relatively minor role in affecting the speciation of trace metals prior to the current time. This is because the relatively low accumulation (i.e., < 8 × 10−3 mol kg−1) of TiO2 NPs before 2021 results in the lower rate (>100 times) for speciation changes of both molybdenum and tungsten compared to the rate for natural geochemical processes. On the other hand, our results suggest that TiO2 NPs will likely impact the oxyanion cycling in the near future owing to the increasing accumulations of TiO2 NPs in estuarine sediments." @default.
• W4283394631 created "2022-06-25" @default.
• W4283394631 creator A5025754198 @default.
• W4283394631 creator A5044473947 @default.
• W4283394631 creator A5052804398 @default.
• W4283394631 creator A5059510663 @default.
• W4283394631 date "2022-10-01" @default.
• W4283394631 modified "2023-09-30" @default.
• W4283394631 title "Potential impacts of titanium dioxide nanoparticles on trace metal speciation in estuarine sediments" @default.
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• W4283394631 doi "https://doi.org/10.1016/j.scitotenv.2022.156984" @default.
• W4283394631 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35760184" @default.
• W4283394631 hasPublicationYear "2022" @default.
• W4283394631 type Work @default.

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