A5038201934- Nanoparticles: synthesis and applications
- Heavy metals in environment
- Analytical chemistry methods development
- Advanced Nanomaterials in Catalysis
- Ion-surface interactions and analysis
- Graphene and Nanomaterials Applications
- Nanocluster Synthesis and Applications
- Geochemistry and Elemental Analysis
- nanoparticles nucleation surface interactions
- Field-Flow Fractionation Techniques
- Air Quality and Health Impacts
- Magnetic and Electromagnetic Effects
- Healthcare and Environmental Waste Management
- Marine and environmental studies
- Nanoparticle-Based Drug Delivery
- Spectroscopy and Quantum Chemical Studies
- Water Quality and Pollution Assessment
- Heavy Metals in Plants
- Geochemistry and Geologic Mapping
- Protein purification and stability
- Chromium effects and bioremediation
- Adsorption, diffusion, and thermodynamic properties of materials
- Microplastics and Plastic Pollution
- Air Quality Monitoring and Forecasting
- Coagulation and Flocculation Studies
Material Measurement Laboratory
2016-2024
National Institute of Standards and Technology
2016-2024
University of Massachusetts Amherst
2015
Silicon dioxide (SiO2), in its amorphous form, is an approved direct food additive the United States and has been used as anticaking agent powdered products a stabilizer production of beer. While SiO2 for many years, there limited information regarding particle size distribution. In recent use raised attention because possible presence nanoparticles. Characterization understanding their physicochemical properties utilizing modern analytical tools are important safety evaluation this...
The increased use and incorporation of engineered nanoparticles (ENPs) in consumer products requires a robust assessment their potential environmental implications. However, lack standardized methods for nanotoxicity testing has yielded results that are sometimes contradictory. Standard ecotoxicity assays may work appropriately some ENPs with minimal modification but produce artifactual others. Therefore, understanding the robustness range is critical. In this study, we evaluated performance...
Strategies are provided for making robust measurements of engineered nanomaterial bioaccumulation across a broad range organisms.
For environmental studies assessing uptake of orally ingested engineered nanoparticles (ENPs), a key step in ensuring accurate quantification ENPs is efficient separation the organism from that are either nonspecifically adsorbed to and/or suspended dispersion following exposure. Here, we measure 30 and 60 nm gold (AuNPs) by nematode, Caenorhabditis elegans, using sucrose density gradient centrifugation protocol remove noningested AuNPs. Both conventional inductively coupled plasma mass...
Abstract The nematode Caenorhabditis elegans is used extensively in molecular, toxicological and genetics research. However, standardized methods for counting nematodes liquid culture do not exist despite the wide use of need accurate measurements. Herein, we provide a simple affordable protocol developed to maximize count accuracy minimize variability culture. Sources process were identified tested 14 separate experiments. Three variables resulted significant effects on count: shaking...
We describe the outcome of a large international interlaboratory study measurement particle number concentration colloidal nanoparticles, project 10 technical working area 34, "Nanoparticle Populations" Versailles Project on Advanced Materials and Standards (VAMAS). A total 50 laboratories delivered results for 30 nm gold nanoparticles measured using tracking analysis (PTA), single inductively coupled plasma mass spectrometry (spICP-MS), ultraviolet-visible (UV-Vis) light spectroscopy,...
This paper describes a comprehensive investigation of particle number concentrations including multi-method comparison, theoretical modeling, and cellular dosimetry.
Liver plays a major role in metabolism and acts as source of energy for the body by storing glycogen. With growing interest investigation biological effects recent years, it is important necessary to develop accurate comparable analytical methods elements bio-samples. It has, however, been 10 years since tissue sample (bovine liver) CCQM-K49 key comparison. The purpose CCQM-K145 ensure traceable measurement results essential toxic such P, S, Zn, Mn, Ni, Mo, Sr, Cr, Co, Pb, As Hg bovine liver...