title: Impact of carbon nanotubes on the toxicity of inorganic arsenic [AS(III) and AS(V)] to Daphnia magna: The role of certain arsenic species.
abstract: As a type of emerging nanomaterial, hydroxylated multiwalled carbon nanotubes (OH-MWCNTs) may interact with other pollutants in the aquatic environments and further influence their toxicity, transport, and fate. Thus, evaluation of toxicity to arsenic in the presence of CNTs needs to receive much more attention. The present study was conducted to explore the underlying mechanisms of OH-MWCNT-induced arsenic (As[III] and As[V]) toxicity changes in the aquatic organism Daphnia magna at different pH levels. The most toxic species for As(III) and As(V) to D. magna were found to be H2 AsO3 (-) and H2 AsO4 (-) . It appeared that the pH values were of greatest importance when the biological toxicity of As(III) and As(V) was compared. Furthermore, the effects of OH-MWCNTs on arsenic toxicity to D. magna indicated that the presence of OH-MWCNTs could enhance the toxicity of arsenic. The interactions of arsenic with OH-MWCNTs were further investigated by conducting adsorption experiments. The adsorption capacity of As(V) by OH-MWCNTs was found to be higher than that of As(III). To conclude, adsorption of certain arsenic species onto OH-MWCNTs is crucial for a reliable interpretation of enhanced toxicity. Environ Toxicol Chem 2016;35:1852-1859. © 2016 SETAC.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Xinghao
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Ruijuan
authors.initials: R
authors.lastname: Qu
authors.affiliation: Department of Zoology, Faculty of Science, King Saud University, Riyadh, Saudi Arabia.|Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt.
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Allam
authors.affiliation: Department of Zoology, Faculty of Science, King Saud University, Riyadh, Saudi Arabia.
authors.forename: Jamaan
authors.initials: J
authors.lastname: Ajarem
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Zhongbo
authors.initials: Z
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Zuoyao
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000818:Animals; D001151:Arsenic / Q000633:toxicity*; D003621:Daphnia / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D037742:Nanotubes, Carbon / Q000633:toxicity*; D023382:Toxicity Tests, Acute; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity*
chemical_list: D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D001151:Arsenic
keywords: Adsorption; Arsenic species; Daphnia magna; Hydroxylated multiwalled carbon nanotubes; Toxicity