Effects of copper in Daphnia are modulated by nanosized titanium dioxide and natural organic matter: what is the impact of aging duration?

ABSTRACT: During its aquatic life cycle, nanosized titanium dioxide (nTiO₂) may interact with natural organic matter (NOM) ultimately altering the ecotoxicity of co-occurring chemical stressors such as heavy metals (e.g. copper (Cu)). In this context, the following hypotheses were tested: (1) aging of nTiO₂ along with Cu reduces Cu toxicity, (2) nTiO₂ agglomerates have a lower potential to reduce Cu toxicity and (3) aging of nTiO₂ in presence of NOM reduces Cu toxicity further. A multifactorial test design crossing three nTiO₂ levels (0.0, 0.6 and 3.0 mg/L) with two levels of NOM (0 versus 8 mg total organic carbon (TOC)/L) and seven nominal Cu concentrations (ranging from 0 to 1536 μg/L) aged in ASTM medium for 0, 1, 3 and 6 days was realised,

SUBMITTER: Roy R 

PROVIDER: S-EPMC7943511 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature