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Records 26 to 50 of 9726

Exposure to Inorganic Arsenic in Rice in Brazil: A Human Health Risk Assessment
(JOURNAL) [Published : Dec 08, 2022]
In certain populations, rice is the main source of exposure to inorganic arsenic (iAs), which is associated with cancer and non-cancer effects. Although rice is a staple food in Brazil, there have been few studies about the health risks for the Brazilian population. The objective...
Stability of Per- and Polyfluoroalkyl Substances in Solvents Relevant to Environmental and Toxicological Analysis
(JOURNAL) [Published : Nov 04, 2021]
Per- and polyfluoroalkyl substances (PFASs) are widely used anthropogenic chemicals. For environmental and toxicological analysis, it is important to understand the stability of PFASs, including novel per- and polyfluoroalkyl ether acids (PFEAs), in commonly used solvents. In thi...
Effects of Bioaugmentation on the Removal of MC-LR and Bacterial Community Structure in Biological Sand Filtration for Drinking Water Treatment
(PRESENTATION) [Presented : Dec 08, 2022]
Evaluate the use of biologically active drinking water filters for removal of HABs-related metabolites as measured using toxicity assays
Clean or Replace? Decontamination Framework for Firefighting Equipment and Hangars - Presentation
(PRESENTATION) [Presented : Jun 07, 2022]
Many aqueous film forming foam (AFFF) delivery systems in aircraft hangars and firefighting vehicles may require thorough cleaning to avoid ongoing environmental impacts from residual per- and polyfluoroalkyl substances (PFAS) within those systems. Though replacement AFFF formula...
Promoting phosphorus recovery at livestock facilities in the Great Lakes region: Analysis of incentive policies
(PAPER IN NON-EPA PROCEEDINGS) [Published : Jun 10, 2022]
Intensive farming activities release large amounts of phosphorus into the environment in the form livestock manure, contributing to the eutrophication of waterbodies, and can lead to algal bloom episodes. This work conducts a study on the design and analysis of incentive policies...
Quantifying coastal ecosystem trophic state at a macroscale using a Bayesian analytical framework
(JOURNAL) [Published : Sep 01, 2022]
One of the goals of coastal ecological research is to describe, quantify and predict human effects on coastal ecosystems. Broad cross-systems assessments to classify ecosystem status or condition have been developed, but are not updated frequently, likely because a lot of informa...
NSF/ANSI 53 Certified Water Filter Efficacy in Benton Harbor, Michigan
(PRESENTATION) [Presented : Nov 17, 2022]
The City of Benton Harbor, MI, initially exceeded EPA’s Lead and Copper Rule (LCR) lead action level (AL) of 15 ppb in 2018. The system continued to exceed the Pb AL during five additional monitoring periods from 01/2019 to 06/2021, and the 90th percentile decreased to the ...
A Comparative Review of Passive Sampling to Conventional Metrics for Evaluating Sediment Remediation Efficacy
(PRESENTATION) [Presented : Jan 12, 2023]
Background/Objectives: Contaminated sediments are present at 36% of active National Priority List sites in the United States, and remediation of these sediments to reduce human health or ecological risk can be costly and complex. Over the last few decades, passive sampling device...
PFAS Occurrence Modeling, Research, and Treatment Data Analysis and Modeling – An EPA Research Overview
(PRESENTATION) [Presented : Nov 17, 2022]
Within the EPA PFAS Strategic Roadmap, ORD, OW, and other partners are working more closely together than ever before to reach common goals.  The overall objective of this session is to share some of the breadth and depth of ongoing work.  Descriptions of the six presen...
Investigations of Aquatic Applications in Google Earth Engine
(PRESENTATION) [Presented : Jan 10, 2023]
The GEOAquawatch working group is exploring the ability of Google Earth Engine to meet the shared need for comprehensive, open access water quality information on a global scale. This webinar will provide an overview of the group's activities and facilitate a discussion among the...
Recent advances on PFAS degradation via thermal and nonthermal methods
(JOURNAL) [To be published : Mar 15, 2023]
Per- and polyfluoroalkyl substances (PFAS) are a set of synthetic chemicals which contain several carbon-fluorine (C¿F) bonds and have been in production for the past eight decades. PFAS have been used in several industrial and consumer products including nonstick pans, fo...
Barnstable enhanced septic system demonstration update
(PRESENTATION) [Presented : Dec 01, 2022]
Onsite wastewater disposal contributes to excess nitrogen in groundwater and receiving waters and a range of associated  impairments. The Nutrients Solutions-Driven Research (SDR) pilot has engaged a large group of stakeholders seeking to improve water quality through interv...
Cumulative maternal and neonatal effects of combined exposure to a mixture of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) during pregnancy in the Sprague-Dawley rat
(JOURNAL) [Published : Nov 12, 2022]
This sub-product will describe data generated from postnatal studies in Sprague-Dawley rats on the key events and adverse outcomes of oral gestational exposure to a mixture of PFOA and PFOS. Each of these compounds has been shown to individually produce numerous maternal and offs...
Evaluation of Innovative/Alternative Septic Systems for the Removal of Contaminants of Emerging Concern
(PRESENTATION) [Presented : Nov 17, 2022]
Groundwater is susceptible to elevated nitrogen concentration and co-pollutants from a variety of sources, including onsite wastewater treatment systems. For example, conventional onsite septic systems can release high levels of both nutrients (e.g., nitrogen and phosphorus) and ...
Application of neural network in metal adsorption using biomaterials (BMs): a review
(JOURNAL) [Published : Jan 01, 2023]
With growing environmental consciousness, biomaterials (BMs) have garnered attention as sustainable materials for the adsorption of hazardous water contaminants. These BMs are engineered using surface treatments or physical alterations to enhance their adsorptive properties. The ...
Evaluation of two methods for detection of viable Bacillus anthracis simulant spores in maritime environmental samples
(JOURNAL) [Published : Jan 03, 2023]
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...
Predicting Location and Evaluating Progression of Clogging in a Permeable Pavement Parking Lot
(JOURNAL) [Published : Dec 20, 2022]
The EPA’s Office of Research and Development constructed a permeable pavement demonstration site at the Edison Environmental Center, NJ in 2009. Infiltration testing of three original permeable parking rows from December 2009 through August 2012 indicated that clogging occu...
Thematic Summary: Cumulative Impacts Research Input Listening Sessions with Tribes and State and Local Agencies
(SUMMARY) [Published : Sep 23, 2021]
In planning for the next Strategic Research Action Plan (FY23-FY26 StRAP), EPA held four listening sessions in 2021 (September 16, 20, and 23) with tribal and state and local partners. This document contains a thematic summary of their perspectives on research needs related to cu...
Identifying the Largest Nutrient Input Sources for HUC8 Sub-basins across the United States
(NEWSLETTER ARTICLE) [Published : Nov 01, 2022]
Limited resources need to be leveraged efficiently and effectively to prioritize watersheds for restoration and management of nitrogen (N) and phosphorus (P) pollution. Accurate, complete and timely information about pollution sources is foundational for decision making. EPA-ORD ...
Stream nitrogen response to Clean Air Act policies in the US: An application of National Nutrient Inventory and the National Rivers and Streams Assessment.
(PRESENTATION) [Presented : Dec 16, 2022]
Air quality regulations have decreased nitrogen (N) and sulfur (S) deposition to the United States (US) landscape over the last several decades. To assess the stream response to declining deposition across the US, we combined the US EPA’s National Nutrient Inventory with N ...
Uptake and Release of Benzene from Stagnant Drinking Water Pipes
(PRESENTATION) [Presented : Nov 17, 2022]
Organic contaminants such as benzene can enter drinking water systems through several mechanisms such as oil spills, industrial accidents, and natural disasters. Recently, benzene contamination has been discovered in drinking water systems affected by wildfires in California. Exa...
Evaluation of Nitrogen and Carbon Stable Isotopes in Filter Feeding Bivalves and Surficial Sediment for Assessing Aquatic Condition in Lakes and Estuaries
(JOURNAL) [Published : Nov 16, 2022]
Excessive inputs of nitrogen from anthropogenic activities in watersheds can cause detrimental effects to aquatic sites. Here, we (1) tested the use of stable isotopes of nitrogen (δ15N) and carbon (δ13C) in benthic organic matter as proxies for isotope ratios in hard...
Decades of reactions - how pipe scale analyses can help to answer questions
(PRESENTATION) [Presented : Nov 17, 2022]
Drinking water utilities have many tools (e.g., bench scale studies, background water quality monitoring, solubility modeling, investigative sampling, etc.) at their disposal to evaluate lead release within their systems. Each tool has a specific purpose(s) in understanding lead ...
Cost Comparison of Soil Vapor Extraction and Subslab Depressurization for Vapor Intrusion Mitigation
(JOURNAL) [Published : Nov 18, 2022]
Soil vapor extraction (SVE) can be applied for remediation, and also as an alternative to sub-slab depressurization (SSD) for vapor intrusion (VI) mitigation. This study compares capital, operation, and treatment costs of SVE and SSD systems using data collected during a multi-ye...
Mississippi River Basin and Gulf Hypoxia Research Overview
(PRESENTATION) [Presented : Aug 11, 2021]
An overview of four Mississippi River Basin modeling efforts was presented: Nutrient Inventories: Links to MRB Water Quality; Synthesis of BMP Effectiveness in the UMRB; Modeling the UMRB: wetlands, nutrients, and more; and Multi-media modeling of the MRB and Northern GOM Hypoxia...