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The field of non-targeted analysis (NTA) is rapidly advancing due to technology developments supporting high-resolution mass spectrometry. The EPA has been developing software tools to support NTA and a core aspect of this work has been the delivery of supporting cheminformatics ...

A primary sink of many air pollutants and their precursors is dry deposition. Dry deposition estimates differ substantially across chemical transport models yet an understanding of the drivers of the inter-model spread is incomplete. Here we introduce Activity 2 of the Air Qualit...

A primary sink of many air pollutants and their precursors is dry deposition. Dry deposition estimates differ substantially across chemical transport models yet an understanding of the drivers of the inter-model spread is incomplete. Here we introduce Activity 2 of the Air Qualit...

It is imperative to develop sampling and analytical methods to characterize FTOHs in indoor air for the development of mass transfer models to quantitatively predict FTOH emissions and transport for exposure assessment and risk management. This standard describes thermal desorpti...

Analytical methods can vary in nature from detailed regulatory methods to more summary in nature. Regulatory method documents can include details of analytes which can be studied, supported matrices, reagents, methodological details, statistical performance, interlaboratory valid...

The purpose of this lecture is to provide current state of the science with regards to waterborne protozoa. It describes the biology and human health significance of Toxoplasma gondii.

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...

Per- and polyfluorinated alkyl substances (PFAS) compose a group of thousands of synthetic chemicals with advantageous physical and chemical properties for consumer and industrial applications. PFAS have stain-resistant, water-resistant, non-stick, and lubricating properties and ...

While high-resolution MS (HRMS) can be used for identification and quantification of novel per- and polyfluorinated alkyl substances (PFAS), low-resolution MS/MS is the more commonly used and affordable approach for routine PFAS monitoring. Of note, perfluoropentanoic acid (PFPeA...

Presentation 01/08/2023 -International Conference on the Remediation and Management of Contaminated Sediments.  Topic: Analytical methods for PFAS in environmental media. Types of analytical and standard methods. Drinking Water Sample Methods Method 537 Method 533 Non-Drink...

Analytical methods can vary in nature from detailed regulatory methods to more summary in nature. Regulatory method documents can include details of analytes which can be studied, supported matrices, reagents, methodological details, statistical performance, interlaboratory valid...

Analytical methods can vary in nature from detailed regulatory methods to more summary in nature. Regulatory method documents can include details of&nbsp;analytes which can be studied, supported matrices, reagents, methodological details, statistical performance, interlaboratory ...

Littoral habitat is critical for lake biota, but it is adversely affected by residential shoreland development through the loss and reduced structural complexity of lakeshore vegetation. There currently exists no assessment methodology for evaluating littoral habitat condition of...

In recent years, the growth of scientific data and the increasing need for data sharing and collaboration in the field of environmental chemistry has led to the creation of various software and databases that facilitate research and development into the safety and toxicity of che...

Background:&nbsp;Human exposure to per- and polyfluoroalkyl substances has been modeled to estimate serum concentrations. Given that the production and use of these compounds have decreased in recent years, especially PFOA and PFOS, and that additional concentration data have bec...

Elevated levels of per- and polyfluoroalkyl substances (PFAS) widely detected in consumer products, building materials, indoor air, and house dust underscore the relevance of the indoor environment to human exposure. Another source of PFAS in the indoor environment is through vap...

Several thousand intentional and unintentional chemical releases occur annually in the U.S., with the contents of almost 30% being of unknown composition. When targeted methods are unable to identify the chemicals present, alternative approaches, including non-targeted analysis (...

This presentation is a brief overview of US Federal and State activities for microplastics. It includes a summary of plastics legislation in the US and highlights federal and state governmental response to legislative mandates. It focuses on the activities of the US Interagency N...

The United States Environmental Protection Agency (EPA) Office of Research and Development (ORD) is optimizing preconcentration-based gas chromatography/mass spectrometry (GC/MS) analytical methods for determination of ultra-trace concentrations of ethylene oxide (EtO) in ambient...

Per- and polyfluoroalkyl substances (PFAS) are used in industrial processes and found in commercial products. Through their manufacture, use, and disposal, these compounds have become anthropogenic contaminants in air, soil, and water. These chemicals tend to be bioaccumulative a...

The analysis of cyanotoxins in various matrices is complicated by challenges in extraction, concentration, and quantification. Common cyanotoxins in the United States include microcystins, anatoxins, and cylindrospermopsins, which across the various congeners have considerable di...

This talk will provide an update on the status of research performed under Phase 4 of the Air Quality Model Evaluation International Initiative (AQMEII) by more than 10 research groups from North America and Europe. The focus of this initiative is on analyzing deposition of trace...

Solar energy is regarded as clean technology, but what happens to solar panels once they reach the end of their lifetime is vital for sustainability and achieving a circular economy. Current solar panels have an average lifespan of about 25 years. Millions of solar panels install...

Analytical methods exist to detect biothreat agents in environmental samples during a response to biological contamination incidents. However, the coastal zone facilities and assets of the United States Coast Guard (USCG), including response boats in diverse geographical areas an...

EPA’s draft document describes the planning and problem formulation steps of cumulative risk assessments (CRAs) and offers guidelines for when such assessments might be appropriate. The document provides recommendations to aid in developing a CRA analysis plan, but they do not pr...