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Microscopy is often the first step in microplastic analysis and is generally followed by spectroscopy to confirm material type. The value of microscopy lies in its ability to provide count, size, color, and morphological information to inform toxicity and source apportionment. To...

Quality assurance and quality control (QA/QC) techniques are critical to analytical chemistry, and thus the analysis of microplastics. Procedural blanks are a key component of QA/QC for quantifying and characterizing background contamination. Although procedural blanks are becomi...

Overview presentation on ORD’s Technical Assistance Program for Emerging Contaminants

To present EPA PFAS research to the primacy agency and small drinking water utilities in Idaho. 

In March 2021, EPA released the <em>Systematic Review Protocol for the Inorganic Mercury Salts IRIS Assessment (Preliminary Assessment Materials)</em>. As part of developing a draft IRIS assessment, EPA presents a methods document, referred to as the protocol, for conducting a ch...

Coral reefs—which provide valued ecosystem services such as fisheries, coastal protection, and tourism—are threatened by the effects of increased sea surface temperatures, sea level rise, and intensifying storms. These large-scale stressors are interacting with local stressors su...

Microplastic contamination raises concerns in drinking water quality due to difficulties in removing them during treatment and potential for contaminant leaching. EPA&rsquo;s Office of Research and Development is interested in developing sampling and analytical methods for microp...

EPA is developing new, rapid methods for monitoring water quality at beaches to determine adequacy of water quality for swimming. The methods being developed rely upon quantitive polymerase chain reaction technology. They will permit real time decisions regarding beach closures...

This is a presentation to the Water Treatment Interagency Working Group and is a summary of EPA/ORDs water sensor research effort, focusing on drinking water applications.&nbsp;

Reliable and comprehensive PFAS and PFAS-related emission measurement methods are needed for multiple purposes with some in use. Efficacy of combustion and non-combustion applications is important for all media and waste types with encouraging results and laboratory tests continu...

Water quality standards are important for protecting and restoring the condition of lakes, rivers, estuaries, and other water bodies in the United States. Given that nutrient pollution continues to be a widespread problem in aquatic systems, the development of numeric nutrient cr...

Emerging contaminants of concern (ECCs), such as flame retardants and per- and poly-fluoroalkyl substances (PFAS), are frequently detected in various environmental compartments and biological matrices/species due to widespread use and release through different exposure pathways. ...

Background: Mechanistic understanding of transient exposures that lead to adverse health outcomes will enhance our ability to recognize biological signatures of disease. Here, we measured the transcriptomic and epigenomic alterations due to exposure to the metabolic reprogramming...

Excess nutrients (nitrogen and phosphorus) in lakes can lead to eutrophication, hypoxia, and algal blooms that may harm aquatic life and people.&nbsp;&nbsp;Some U.S. states have established numeric water quality criteria for nutrients to protect surface waters.&nbsp;&nbsp;However...

The presentation prevents an overview of ORDS research on risk assessment and systems analysis of decentralized water reuse approaches to a group of graduate students in an interdisciplinary program on science, technology, engineering, and policy. The organizers are interest in p...

New chemical formulations are being tested to replace PFAS-containing fire-fighting foams in several applications, including systems designed to protect aviation fuels, weapons, chemical tankers, and large petroleum tanks. The current efforts are focused on identifying and synthe...

Following Executive Order 14072 issued in April 2022, the Office of Science and Technology Policy, Office of Management and Budget, and Department of Commerce published the final National Strategy to Develop Statistics for Environmental-Economic Decisions (National Strategy) in J...

Antimicrobial resistance (AMR) is a global crisis threatening human, animal, and environmental health. The natural environment, specifically water resources, has been recognized as a reservoir and dissemination pathway for AMR; however, urban karst aquifer systems have been overl...

Benthic invertebrates are important trophic links in aquatic food webs and serve as useful bioindicators of environmental conditions because their responses integrate the effects of both water and sediment qualities. However, long-term data sets for benthic invertebrate assemblag...

Historic droughts in western states driven by anthropogenic warming have resulted in an unprecedented increase in wildfire frequency and area burned. In the last few decades, fire acres burned in the United States have more than doubled, with concomitant increased risk to human h...

EPA Wildfire Research: Impacts on Air and Water Quality WESTAR-WRAP Spring Business Meeting 2024, Riverside, California Wildland fire smoke impacts millions of people in the United States every year. The EPA&rsquo;s Office of Research and Development is addressing our increasingl...

This study characterized Bacillus globigii (BG) as a Bacillus anthracis Sterne (BAS) surrogate for wastewater treatment-related studies of UV inactivation, adsorption onto powdered activated carbon (PAC), and bioaerosol emission. The inactivation of BG was faster than that of BAS...

The number of gray seals (Halichoerus grypus) observed along the United States Northwest Atlantic region has been increasing for decades. These colonial animals often haul-out on beaches seasonally in numbers ranging from a few individuals to several thousands. While these larger...

Variations in stratospheric ozone and changes in the aquatic environment by climate change and human activity are modifying the exposure of aquatic ecosystems to UV radiation. These shifts in exposure have consequences for the distributions of species, biogeochemical cycles, and ...

Stream macroinvertebrate assemblages are shaped by natural and human-related factors that operate through complex hierarchical pathways. Quantifying these relationships can support stream ecological assessment. We applied a structural equation modeling framework to evaluate hypot...