A5004112273- Atmospheric chemistry and aerosols
- Odor and Emission Control Technologies
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Environmental remediation with nanomaterials
- Water Quality Monitoring and Analysis
- Advanced Chemical Sensor Technologies
- Atmospheric and Environmental Gas Dynamics
- Advanced oxidation water treatment
- Indoor Air Quality and Microbial Exposure
- Heavy metals in environment
- X-ray Spectroscopy and Fluorescence Analysis
- Radioactivity and Radon Measurements
- Conservation Techniques and Studies
- Analytical chemistry methods development
- Arsenic contamination and mitigation
- Atmospheric Ozone and Climate
- Analytical Chemistry and Sensors
RTI International
2020-2023
Illinois Archaeological Survey
2009-2012
University of Illinois Urbana-Champaign
2012
Eastern Illinois University
2000-2003
Abstract Sulfur compounds are an important constituent of particulate matter, with impacts on climate and public health. While most sulfur observed in matter has been assumed to be sulfate, laboratory experiments reveal that hydroxymethanesulfonate (HMS), adduct formed by aqueous phase chemical reaction dissolved HCHO SO 2 , may easily misinterpreted measurements as sulfate. Here we present observational modeling evidence for a ubiquitous global presence HMS. We find filter samples collected...
Organosulfates (OSs) are the most abundant class of organosulfur (OrgS) compounds in atmospheric fine particulate matter (PM2.5). Globally, isoprene-derived OSs (iOSs) abundantly reported OSs; however, total sulfur mass closure PM2.5 has not been conducted at molecular level order to understand how iOS contributions vary by season and location United States (U.S.). In this work, iOSs were quantitively characterized collected from 20 ground sites within Interagency Monitoring Protected Visual...
Abstract. Organic sulfur and sulfate compounds, which are tracers for sources atmospheric processes, not currently measured in national monitoring networks such as the Interagency Monitoring of Protected Visual Environments (IMPROVE). The goal this paper is to begin assess stability organic sulfate-containing compounds on polytetrafluoroethylene (PTFE) filters suitability Fourier-transform infrared (FT-IR) spectroscopy measure these compounds. Stability assessment needed because PTFE samples...
Abstract. Organic sulfur and sulfate compounds, tracers for sources atmospheric processes, are not currently measured in national monitoring networks such as the Interagency Monitoring of Protected Visual Environments (IMPROVE). The goal this paper is to begin assess stability organic containing compounds on polytetrafluoroethylene (PTFE) filters suitability Fourier-transform infrared (FT-IR) spectroscopy measure these compounds. Stability assessment needed because PTFE samples collected by...
Dinosaur National Monument (DINO) is located near the northeastern edge of Uinta Basin and often experiences elevated levels wintertime ground-level ozone. Previous studies have shown that high ozone mixing ratios in are driven by volatile organic compounds (VOCs) nitrogen oxides (NOx) from regional oil gas development coupled with temperature inversions enhanced photochemistry persistent snow cover. Here, we show cover inversions, along abundant ammonia, also lead to haze this region. A...
Sulfur (S) and sulfate (SO42- ) in fine particulate matter (PM2.5 are monitored by the Interagency Monitoring of Protected Visual Environments (IMPROVE) network at remote rural sites across United States. Within IMPROVE network, S is determined from X-ray fluorescence (XRF) spectroscopy a Teflon filter, SO42- via ion chromatography (IC) nylon filter. Differences estimates may indicate presence organosulfur (OS) species or biases between sampling analytical methods. To reduce potential...
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...