Hydrologist (HNB) / National Water Quality Network Coordinator
Office of the Chief Operating Officer
Email:
mriskin@usgs.gov
Office Phone:
609-771-3924
Fax:
609-771-3915
ORCID:
0000-0001-6499-3775
Location
NJ WSC Lawrenceville 1
3450 Princeton Pike
Suite 110
Lawrenceville
, NJ
08648
US
Supervisor:
Brian E McCallum
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The USGS National Field Manual (NFM) states “A representative sample is one that typifies in time and space that part of the aqueous system to be studied” and “obtaining representative samples is of primary importance for a relevant description of the environment.” The NFM contains detailed chapters on the best practices for representative and contamination free sampling of major and trace metals (U.S. Geological Survey 2006). However, as analytical capabilities have advanced and new preservation methods developed, there is a need to study the effectiveness of various amounts of nitric acid preservation for trace metals and major cations in surface water and groundwater. The amount of nitric acid prescribed by...
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In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project. One of the major goals of the NAWQA project was to determine how river water quality has changed over time. To support that goal, long-term consistent and comparable monitoring has been conducted by the USGS on streams and rivers throughout the Nation. Outside of the NAWQA project, the USGS and other Federal, State, and local agencies also have collected long-term water-quality data to support their own assessments of changing water quality. In 2017, data from these multiple sources were combined to support one of the most comprehensive assessments...
Tags: Alkalinity,
Ammonia,
Bromide,
Calcium,
Chloride, All tags...
Dissolved organic carbon,
Fluoride,
Magnesium,
Major ions,
Nitrate,
Orthophosphate, filtered,
Orthophosphate, unfiltered,
Particulate organic carbon,
Potassium,
Puerto Rico,
Sodium,
Specific conductance,
Sulfate,
Suspended sediment concentration,
Total dissolved solids,
Total nitrogen,
Total organic carbon,
Total phosphorus,
Total suspended solids,
United States,
Weighted regressions on time, discharge and season (WRTDS),
environment,
nutrient content (water),
salinity,
suspended material (water), Fewer tags
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In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project. One of the major goals of the NAWQA project was to determine how river water quality has changed over time. To support that goal, long-term consistent and comparable monitoring has been conducted by the USGS on streams and rivers throughout the Nation. Outside of the NAWQA project, the USGS and other Federal, State, and local agencies also have collected long-term water-quality data to support their own assessments of changing water quality. In 2017, data from these multiple sources were combined to support one of the most comprehensive assessments...
Tags: Alkalinity,
Ammonia,
Bromide,
Calcium,
Chloride, All tags...
Dissolved organic carbon,
Fluoride,
Magnesium,
Major ions,
Nitrate,
Orthophosphate, filtered,
Othophosphate, unfiltered,
Particulate organic carbon,
Potassium,
Puerto Rico,
Sodium,
Specific conductance,
Sulfate,
Suspended sediment concentration,
Total dissolved solids,
Total nitrogen,
Total organic carbon,
Total phosphorus,
Total suspended solids,
United States,
Water quality,
Water-quality trends,
Weighted regressions on time, discharge, and season (WRTDS),
environment,
nutrient content (water),
salinity,
suspended material (water), Fewer tags
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From 2018 to 2024 surface waters (fresh and brackish), groundwater, and stormwater (runoff, re-use) samples were collected from sites with varying landuse (agricultural, forested, and urban) and streamflow conditions and analyzed at the Organic Geochemistry Research Laboratory in Lawrence, Kansas for the tire antioxidant 6PPD (6-p-phenylenediamine; N-(1,3-Dimethylbutyl)-N’-phenyl-p-phenylenediamine) and ozonated transformation product 6PPD-quinone (6PPD-Q, 2-((4-Methylpentan-2-yl)amino)-5-(phenylamino)cyclohexa-2,5-diene-1,4-dione)). There were 78 urban sampling sites in Colorado (N=15), Connecticut (N=1), Georgia (N=1), Hawaii (N=22), Kansas (N=7), Michigan (N=1), Minnesota (N=1), North Carolina (N=1), Oklahoma...
Tags: 6PPD,
6PPD-Q,
Aquatic Biology,
Ecology,
Environmental Health, All tags...
Stormwater,
USGS Science Data Catalog (SDC),
United States,
Water Quality,
Water Resources,
environment,
inlandWaters,
liquid chromatography,
mass spectrometry,
stormwater,
tire,
tire and road wear particles,
urban,
water chemistry, Fewer tags
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In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project. One of the major goals of the NAWQA project was to determine how river water quality has changed over time. To support that goal, long-term consistent and comparable monitoring has been conducted by the USGS on streams and rivers throughout the Nation. Outside of the NAWQA project, the USGS and other Federal, State, and local agencies also have collected long-term water-quality data to support their own assessments of changing water quality. In 2017, data from these multiple sources were combined to support one of the most comprehensive assessments...
Categories: Data;
Tags: Major ions,
Puerto Rico,
USGS Science Data Catalog (SDC),
United States,
Water Quality, All tags...
Water Quality,
Water Quality Parameters,
Water-quality trends,
Weighted regressions on time, discharge, and season (WRTDS),
environment,
nutrient content (water),
salinity,
suspended material (water),
water quality,
water resources, Fewer tags
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