A5081065943- Nanoparticles: synthesis and applications
- Environmental Toxicology and Ecotoxicology
- Heavy metals in environment
- Arsenic contamination and mitigation
- Geochemistry and Elemental Analysis
- Pharmaceutical and Antibiotic Environmental Impacts
- Mercury impact and mitigation studies
- Healthcare and Environmental Waste Management
- Water Quality and Pollution Assessment
- Water Quality Monitoring and Analysis
- Pesticide and Herbicide Environmental Studies
- Freshwater macroinvertebrate diversity and ecology
- Gold and Silver Nanoparticles Synthesis and Applications
- Pesticide Residue Analysis and Safety
- Microplastics and Plastic Pollution
- Aquatic Ecosystems and Phytoplankton Dynamics
- Advanced oxidation water treatment
- Wastewater Treatment and Nitrogen Removal
- Air Quality and Health Impacts
- Enhanced Oil Recovery Techniques
- Environmental remediation with nanomaterials
- Geochemistry and Geologic Mapping
- Selenium in Biological Systems
- Marine and coastal ecosystems
- Electrochemical Analysis and Applications
University of Koblenz and Landau
2012-2024
Institute for Environmental Sciences
2016-2021
Universität Koblenz
2010-2019
Refonet
2019
The production and use of nanoparticles (NP) has steadily increased within the last decade; however, knowledge about risks NP to human health ecosystems is still scarce. Common concerning effects on freshwater organisms largely limited standard short-term (≤48 h) toxicity tests, which lack both fate characterization an understanding mechanisms underlying toxicity. Employing slightly longer exposure times (72 96 h), we found that suspensions nanosized (∼100 nm initial mean diameter) titanium...
Unintentionally released titanium dioxide nanoparticles (nTiO2) may co-occur in aquatic environments together with other stressors, such as, metal ions. The effects of P25-nTiO2 on the toxicity and uptake elements silver (Ag), arsenic (As) copper (Cu) were assessed by applying a factorial test design. design consisted two developmental stages Daphnia magna, levels nTiO2 (0 versus 2 mg/L) as well seven nominal concentrations respective element. presence increased Ag for juveniles indicated...
Summary Ecotoxicology is often criticised for its simplistic approach, which does not normally consider the complexity of field conditions. Simple laboratory experiments can still be useful, however, especially assessing effects emerging stressors such as nanoparticles, exhibit fates, exposure profiles and modes action substantially different from those traditional chemicals. Here we argue that it important to understand potential environmental conditions (e.g. UV radiation, dissolved...
Aggregation status of Ag NPs in ecotoxicological test media is controlled by the Ca<sup>2+</sup>/Mg<sup>2+</sup> ratio, presence Cl<sup>−</sup> and Br<sup>−</sup> NOM quality.
Titanium dioxide nanoparticles (nTiO2) are expected to interact with natural substances and other chemicals in the environment, however little is known about their combined effects. Therefore, this study assessed toxicity of copper (Cu) combination varying crystalline phases (anatase, rutile, mixture) nTiO2 differing organic materials on Daphnia magna. The reduced Cu-toxicity depending product (0.3- 2-fold higher 48-h EC50). This decrease coincided a lowered Cu-concentration water column,...
During their aquatic life cycle, nanoparticles are subject to environmentally driven surface modifications (e.g. agglomeration or coating) associated with aging. Although the ecotoxicological potential of might be affected by these processes, only limited information about impact aging is available. In this context, present study investigated acute (96 h) and chronic (21 d) implications systematically aged titanium dioxide (nTiO2; ~90 nm) on standard test species Daphnia magna following...
The nanoparticle industry is expected to become a trillion dollar business in the near future. Therefore, unintentional introduction of nanoparticles into environment increasingly likely. However, currently applied risk-assessment practices require further adaptation accommodate intrinsic nature engineered nanoparticles. Combining chronic flow-through exposure system with subsequent acute toxicity tests for standard test organism Daphnia magna, we found that juvenile offspring adults were...
Summary The application of fungicides is considered an indispensable measure to secure crop production. These substances, however, may unintentionally enter surface waters via run‐off, potentially affecting the microbial community. To assess such risks adequately, authorities recently called for suitable test designs involving relevant aquatic micro‐organisms. We assessed structural and functional responses leaf‐associated communities, which play a key role in breakdown allochthonous leaf...
Abstract Nanoparticle contaminants enter aquatic ecosystems and are transported along the stream network. Here, we demonstrate a novel pathway for return of nanoparticles from to terrestrial via cross-boundary subsidies. During their emergence, trichopteran caddisflies carried titanium dioxide gold into life stages. Moreover, emergence was delayed by ≤30 days, energy reserves were depleted ≤25%. Based on worst case estimates, it is suggested that predators, such as bats feeding prey, may...
Abstract Titanium dioxide nanoparticles (nTiO 2 ) form reactive oxygen species (ROS) under irradiation by ultraviolet light (UV). This known photocatalytic activity may finally affect the presence and toxicity of organic environmental chemicals, which have not yet been studied at ambient UV intensity. The authors used a three‐factorial design to evaluate interaction carbamate insecticide pirimicarb (initial nominal concentration, 20 µg/L), (40 W/m for 15 min), nTiO (∼100 nm; 2.0 mg/L)....
Nanoparticles' fate is amongst other parameters determined by the quantity and quality of natural organic matter (NOM). Consequently, ecotoxicity nanoparticles modified, while only little information available on NOM characteristics triggering this interplay. This study systematically examined how influences acute titanium dioxide (nTiO2) towards Daphnia magna. Therefore, two nTiO2 products (A-100 P25; ∼100 nm) were investigated in combination with seven types variable at four levels each...
Leaf litter is a major source of carbon and energy for stream food webs, while both leaf-decomposing microorganisms macroinvertebrate leaf shredders can be affected by fungicides. Despite the potential season-long fungicide exposure these organisms, however, such chronic exposures have not yet been considered. Using an artificial facility, effects (lasting up to 8 wk) mixture 5 fungicides (sum concentration 20 μg/L) on leaf-associated key shredder Gammarus fossarum were therefore assessed....
The study provided a better understanding of arsenate bioavailability and toxicity associated with nano-TiO<sub>2</sub>in saltwater environments.