Aqueous Hg2+ associates with TiO2 nanoparticles according to particle size, changes particle agglomeration, and becomes less bioavailable to zebrafish

Halis Boran, David Boyle, Ilhan Altinok, Danae Patsiou, Theodore B. Henry

    Research output: Contribution to journalArticle

    10 Citations (Scopus)
    67 Downloads (Pure)

    Abstract

    Engineered nanoparticles (NPs) have unique physicochemistry and potential to interact with other substances in the aqueous phase. Here, gene [metallothionein 2 (mt2)] expression changes in larval zebrafish were used to evaluate the association between aqueous Hg2+ and TiO2 (NPs and bulk particle size control) to investigate the relationship between changes in Hg2+ behavior and TiO2 size. During 24 h exposures, TiO2 agglomerates increased in size and in the presence of 25 μg Hg2+/L, greater increases in size were observed. The concentration of Hg2+ in suspension also decreased in the presence of TiO2-NPs. Mercury increased expression of mt2 in larval zebrafish, but this response was lessened when zebrafish were exposed to Hg2+ in the presence of TiO2-NPs, and which suggests that TiO2-NPs alter the bioavailability of Hg2+ to zebrafish larvae. This ameliorative effect of TiO2 was also likely due to surface binding of Hg2+ because a greater decrease in mt2 expression was observed in the presence of 1 mg/L TiO2-NPs than 1 mg/L TiO2-bulk. In conclusion, the results show that Hg2+ will associate with TiO2-NPs, TiO2-NPs that have associated Hg2+ will settle out of the aqueous phase more rapidly, and agglomerates will deliver associated Hg2+ to sediment surfaces.
    Original languageEnglish
    Pages (from-to)242–246
    Number of pages5
    JournalAquatic Toxicology
    Volume174
    Early online date24 Feb 2016
    DOIs
    Publication statusPublished - May 2016

    Fingerprint Dive into the research topics of 'Aqueous Hg<sup>2+</sup> associates with TiO<sub>2</sub> nanoparticles according to particle size, changes particle agglomeration, and becomes less bioavailable to zebrafish'. Together they form a unique fingerprint.

    Cite this