Environmental Chemistry Laboratory — Columbia, Missouri. Customized extraction system
David Alvarez, PhD
Dr. Dave Alvarez is a Supervisory Research Chemist at the Columbia Environmental Research Center.
His focus is on the development of innovative methodologies for passive sampler design and complex mixture analysis of various environmental matrices. Research is conducted on emerging and historic contaminants; assessment of the exposure of aquatic and terrestrial organisms and humans to anthropogenic chemicals; and identification of chemicals and their potential sources. The link between chemical occurrence and biological effects are investigated using passive samplers as surrogate biological organisms and screening sampler extracts with in vitro and in vivo tests for estrogenicity, acute toxicity, reproductive and developmental abnormalities. The research is designed to expand the understanding of the roles of physicochemical parameters and environmental factors on the uptake mechanisms of passive samplers. Through our experience and expertise, this research group is recognized as an international leader in the field of passive sampling technologies.
Science and Products
Passive Sampling Using SPMDs and POCIS
The application of passive sampling technologies for the monitoring of legacy and emerging organic chemicals in the environment is becoming widely accepted worldwide.
Filter Total Items: 16
A National Assessment of Pesticide, PFAS, Microplastic, and Antibiotic Resistance Gene Exposures in White-Tailed Deer
Research has documented exposures and consequential environmental health effects of pesticides, PFAS, microplastics, and antibiotic resistance genes in environmental biota. Little is known, however, regarding such effects in white-tailed deer ( Odocoileus virginianus ).
Comprehensive Research on PFAS Exposomics and Risk Assessment
The Columbia Environmental Research Center (CERC) conducts cutting-edge research on per- and polyfluoroalkyl substances (PFAS) through the lens of the One Health Paradigm, emphasizing the interconnectedness of human, animal, and environmental health.
Unique Approach to Measure Per- and Polyfluoroalkyl Substances Uptake in Fish, Mussels, and Passive Samplers
Per- and polyfluoroalkyl substances (PFAS) uptake and bioconcentration by fish and mussels ─ housed in mobile laboratories at a legacy fire-training area contaminated by aqueous film-forming foams ─ varied by species, sex, and compound. PFAS in passive samplers deployed at the same time mimicked uptake by fish but not mussels indicating that passive samplers might prove useful as screening tools...
Advanced PFAS Measurement Methods
Environmental Health Program scientists, in collaboration with other USGS scientists, are developing complementary field and laboratory methods and capabilities to detect and quantify a range of target and nontarget per- and polyfluoroalkyl substances (PFAS) and indicator compounds at low levels (parts per trillion) in a variety of environmental matrices. The PFAS Integrated Science Team is...
Framework Developed to Evaluate the Practicality of Effects-Directed Analyses to Identify Endocrine Active Chemicals in Complex Environmental Sample Mixtures
An effects-directed analyses (EDA) framework for endocrine active chemicals was developed to help decision makers quickly evaluate the efficacy and practicality of an EDA approach in waste and surface waters and how adjustments could be made to increase its success.
Areas of Concern: Niagara River
USGS scientists participated in several projects supporting work in the Niagara River Area of Concern including: 1) Evaluating toxicity in Benthos Sediment, 2) Tracking PCB Sources in the AOC, and Identifying Source Areas Contributing to Contaminants Found in Fish Tissue.
Track down survey of PCBs in three tributaries to the Niagara River Area of Concern (AOC)
Background Industrial discharges of toxic and bio-accumulating compounds to the Niagara River and its tributaries have occurred over many decades. High concentrations of polychlorinated biphenyls (PCBs) have been found in samples of fish tissue from many locations, including three tributaries to the Niagara River: Tonawanda Creek, Two mile Creek, and Rattlesnake Creek (study reaches listed in Tabl
Facilities and Equipment
Laboratories The Environmental Chemistry Branch has a modern laboratory facility with dedicated spaces for sample preparation, inorganic and organic analyses. Steps to minimize background contamination and to protect sample integrity have been incorporated into the laboratory design.
Passive Sampling Using SPMDs and POCIS
The application of passive sampling technologies for the monitoring of legacy and emerging organic chemicals in the environment is becoming widely accepted worldwide.
Passive and Field Sampling
CERC scientists in the Environmental Chemistry Branch are pioneers in the development of passive sampling techniques. Samplers available include: SPMDs (hydrophobic organics in water and air), POCIS (hydrophilic organics in water), stabilized liquid membrane devices (SLMDs), peepers, and diffusion gradients in thin films (DGT). We also have experience modifying existing technologies for specific...
Environmental Chemistry Branch Structure
The Environmental Chemistry Branch is made up of four research sections working collectively towards the common goal of providing information on the role of chemicals in the environment.
Quality Assurance and Quality Control
The Environmental Chemistry Branch uses a robust set of Quality Assurance/Quality Control (QA/QC) approaches to ensure that data are of known and documented quality. Standard criteria can be adjusted to meet individual project requirements and quality assurance project plans (QAPPs).
A customized extraction system used for collection and extraction
Environmental Chemistry Laboratory — Columbia, Missouri. Customized extraction system
Science and Products
Passive Sampling Using SPMDs and POCIS
The application of passive sampling technologies for the monitoring of legacy and emerging organic chemicals in the environment is becoming widely accepted worldwide.
Filter Total Items: 16
A National Assessment of Pesticide, PFAS, Microplastic, and Antibiotic Resistance Gene Exposures in White-Tailed Deer
Research has documented exposures and consequential environmental health effects of pesticides, PFAS, microplastics, and antibiotic resistance genes in environmental biota. Little is known, however, regarding such effects in white-tailed deer ( Odocoileus virginianus ).
Comprehensive Research on PFAS Exposomics and Risk Assessment
The Columbia Environmental Research Center (CERC) conducts cutting-edge research on per- and polyfluoroalkyl substances (PFAS) through the lens of the One Health Paradigm, emphasizing the interconnectedness of human, animal, and environmental health.
Unique Approach to Measure Per- and Polyfluoroalkyl Substances Uptake in Fish, Mussels, and Passive Samplers
Per- and polyfluoroalkyl substances (PFAS) uptake and bioconcentration by fish and mussels ─ housed in mobile laboratories at a legacy fire-training area contaminated by aqueous film-forming foams ─ varied by species, sex, and compound. PFAS in passive samplers deployed at the same time mimicked uptake by fish but not mussels indicating that passive samplers might prove useful as screening tools...
Advanced PFAS Measurement Methods
Environmental Health Program scientists, in collaboration with other USGS scientists, are developing complementary field and laboratory methods and capabilities to detect and quantify a range of target and nontarget per- and polyfluoroalkyl substances (PFAS) and indicator compounds at low levels (parts per trillion) in a variety of environmental matrices. The PFAS Integrated Science Team is...
Framework Developed to Evaluate the Practicality of Effects-Directed Analyses to Identify Endocrine Active Chemicals in Complex Environmental Sample Mixtures
An effects-directed analyses (EDA) framework for endocrine active chemicals was developed to help decision makers quickly evaluate the efficacy and practicality of an EDA approach in waste and surface waters and how adjustments could be made to increase its success.
Areas of Concern: Niagara River
USGS scientists participated in several projects supporting work in the Niagara River Area of Concern including: 1) Evaluating toxicity in Benthos Sediment, 2) Tracking PCB Sources in the AOC, and Identifying Source Areas Contributing to Contaminants Found in Fish Tissue.
Track down survey of PCBs in three tributaries to the Niagara River Area of Concern (AOC)
Background Industrial discharges of toxic and bio-accumulating compounds to the Niagara River and its tributaries have occurred over many decades. High concentrations of polychlorinated biphenyls (PCBs) have been found in samples of fish tissue from many locations, including three tributaries to the Niagara River: Tonawanda Creek, Two mile Creek, and Rattlesnake Creek (study reaches listed in Tabl
Facilities and Equipment
Laboratories The Environmental Chemistry Branch has a modern laboratory facility with dedicated spaces for sample preparation, inorganic and organic analyses. Steps to minimize background contamination and to protect sample integrity have been incorporated into the laboratory design.
Passive Sampling Using SPMDs and POCIS
The application of passive sampling technologies for the monitoring of legacy and emerging organic chemicals in the environment is becoming widely accepted worldwide.
Passive and Field Sampling
CERC scientists in the Environmental Chemistry Branch are pioneers in the development of passive sampling techniques. Samplers available include: SPMDs (hydrophobic organics in water and air), POCIS (hydrophilic organics in water), stabilized liquid membrane devices (SLMDs), peepers, and diffusion gradients in thin films (DGT). We also have experience modifying existing technologies for specific...
Environmental Chemistry Branch Structure
The Environmental Chemistry Branch is made up of four research sections working collectively towards the common goal of providing information on the role of chemicals in the environment.
Quality Assurance and Quality Control
The Environmental Chemistry Branch uses a robust set of Quality Assurance/Quality Control (QA/QC) approaches to ensure that data are of known and documented quality. Standard criteria can be adjusted to meet individual project requirements and quality assurance project plans (QAPPs).
A customized extraction system used for collection and extraction
Environmental Chemistry Laboratory — Columbia, Missouri. Customized extraction system
Environmental Chemistry Laboratory — Columbia, Missouri. Customized extraction system
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government