A5056674033- Air Quality and Health Impacts
- Heavy metals in environment
- Air Quality Monitoring and Forecasting
- Radioactivity and Radon Measurements
- Heavy Metal Exposure and Toxicity
- Atmospheric chemistry and aerosols
- Vehicle emissions and performance
- X-ray Spectroscopy and Fluorescence Analysis
- Noise Effects and Management
- Environmental Justice and Health Disparities
- Nanoparticles: synthesis and applications
- Per- and polyfluoroalkyl substances research
- Graphene and Nanomaterials Applications
- Vasculitis and related conditions
- Nail Diseases and Treatments
- Contact Dermatitis and Allergies
- Carbon Nanotubes in Composites
- Otitis Media and Relapsing Polychondritis
- IgG4-Related and Inflammatory Diseases
- Water Treatment and Disinfection
- Wind and Air Flow Studies
- Water Quality and Pollution Assessment
- Plant Micronutrient Interactions and Effects
- Wastewater Treatment and Reuse
- Lichen and fungal ecology
RTI International
2010-2023
NC Department of Health and Human Services
2022
Research Triangle Park Foundation
2008-2010
Eight institutes using 12 different instruments analyzed newly developed multi-element reference materials (RM) for atmospheric particulate matter (PM) measurements. These RM have the potential to fill a gap in currently available quality assurance resources element analysis of PM samples such as X-ray fluorescence and inductively-coupled plasma mass spectrometry. This study evaluates performance these new generated by University California, Davis. The methodological challenge was determine...
Abstract The U.S. Environmental Protection Agency (EPA)'s PM2.5 Chemical Speciation Network (CSN) and the Interagency Monitoring of Protected Visual Environments (IMPROVE) network use X-ray fluorescence (XRF) analysis to quantify trace elements in samples fine particles less than 2.5 microns aerodynamic diameter (PM2.5). Methods for calculating uncertainty values XRF results vary considerably among laboratories instrument makes models. To support certain types modeling data analysis,...
Objectives. To evaluate lead levels in tap water at licensed North Carolina child care facilities. Methods. Between July 2020 and October 2021, we enrolled 4005 facilities a grant-funded, participatory science testing program. We identified risk factors associated with elevated first-draw using multiple logistic regression analysis. Results. By sample (n = 22 943), 3% of sources exceeded the 10 parts per billion (ppb) hazard level, whereas 25% 1 ppb, American Academy Pediatrics' reference...
This inter-lab study aimed to evaluate the comparability of heavy metal concentrations in same samples using three X-ray fluorescence spectrometers (XRFs) different global re-search institutions, namely a collaboration lab between Soonchunhyang University (Asan, Korea). and PAN (a branch Malvern PANalytical, Seoul, Korea), RTI (Research Triangle Institute, NC, U.S.A), Aerosol laboratory Harvard University, Boston, U.S.A. Indoor air filter were collected from 8 homes 3 filters each household...
Tap water lead testing programs in the U.S. need improved methods for identifying high-risk facilities to optimize limited resources. In this study, machine-learned Bayesian network (BN) models were used predict building-wide risk over 4,000 child care North Carolina according maximum and 90th percentile levels from concentrations at 22,943 taps. The performance of BN was compared common alternative factors, or heuristics, inform among including building age, source, Head Start program...
Multi-element reference materials (ME-RM) were prepared with 28 elements on polytetrafluoroethylene (PTFE) filters utilizing a custom aerosol deposition system and certified multi-element solutions designed to mimic atmospheric particulate composition. ME-RM then distributed eight participating laboratories who provided measurement results via X-ray fluorescence (XRF), particle induced emission (PIXE), inductively coupled plasma mass spectrometry (ICP-MS). Lab-consensus loadings computed...
Abstract A major aspect of lead hazard control is the evaluation soil hazards around housing coated with lead‐based paint. The use field‐portable X‐ray fluorescence (FPXRF) to do detailed surveying, limited laboratory confirmation, can provide measurements in (especially for planning abatement activities) a far more cost‐efficient and timely manner than analysis. To date, one obstacle acceptance FPXRF as an approved method measuring has been lack correspondence between field results. In...
Zinc deficiency and excess can result in adverse health outcomes. There is conflicting evidence regarding whether or deficient zinc the diet contribute to carcinogenicity. The objective of this study was characterize carbonate basic for use as a source dietary rodent toxicity carcinogenicity investigating effects excess. Because complex chemistries compounds, inconsistent nomenclature, literature reference spectra gaps, it necessary employ multiple analytical techniques, including Karl...
Determination of the elemental composition cosmetic products for quality control and impurity analysis has traditionally been performed using plasma spectroscopic techniques that feature time-consuming, hazardous, completely destructive sample preparation steps. Wavelength dispersive X-ray fluorescence spectroscopy (WDXRF) allows quantitative qualitative materials a range masses with less extensive higher throughput. WDXRF requires samples be uniform thickness prepared reproducibly. The high...
Limited information is available regarding chemical water quality at the tap in Guatemala City, preventing individuals, utilities, and public health authorities from making data-driven decisions related to quality. To address this need, 113 participants among households served by a range of providers across City metropolitan area were recruited as participatory scientists collect first-draw flushed samples their residence. Samples transported U.S. analyzed for 20 metals 25 per-...
Particulate matter (PM) concentrations have decreased dramatically over the past 20 years, thus lower method detection limits (MDL) are required for these measurements. Energy-dispersive X-ray fluorescence (XRF) spectroscopy is used to quantify multiple elements simultaneously in United States Environmental Protection Agency (US EPA) Chemical Speciation Network (CSN). Inductively-coupled plasma mass spectrometry (ICP-MS) an alternative analysis with MDL elements. Here, we present a...
<h3>Objective:</h3> It's a show case of GCA with concurrent presence anti MOG antibodies. <h3>Background:</h3> is common vasculitis in people older than 50 and can cause permanent vision loss. On the other hand, antibody disease (MOGAD) also loss through development antibodies that target myelin sheaths CNS. MOGAD are considered separate processes. anti-MOG has not been published any reports. This first documenting atypical <h3>Design/Methods:</h3> A 64-year-old woman PMH hypertension...
Background/Aim: Associations between exposure to traffic-related fine particulate matter (tr-PM2.5) and health are not fully understood. Exposure tr-PM2.5 while commuting may reflect an important environment relevant for health. However, estimating is challenging because a spatially heterogeneous chemical mixture that cannot generally be directly observed. We compare two approaches estimate personal among commuters.Methods: measured continuous PM2.5 48-hour integrated metals black carbon...