Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of the total phosphorus by a Kjeldahl digestion method and an automated colorimetric finish that includes dialysis

Patton, Charles J.; Truitt, Earl P.

doi:10.3133/ofr92146

Cited by 171 publications

(131 citation statements)

References 4 publications

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“…Nutrients, common ions, and DOC were analyzed at the USGS National Water Quality Laboratory in Denver, Colorado (Fishman and Friedman, 1989;Patton and Truitt, 1992;Brenton and Arnett, 1993;Fishman, 1993;Patton and Truitt, 2000). Dissolved N 2 , Ar, and CH 4 were measured at the USGS Dissolved Gas Laboratory in Reston, Virginia, by gas chromatography (Busenberg et al, 1998).…”

Section: Usgs Samplesmentioning

confidence: 99%

Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA

Hinkle

Böhlke

Duff

et al. 2007

Journal of Hydrology

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Summary Geochemical and isotopic tools were applied at aquifer, transect, and subtransect scales to provide a framework for understanding sources, transport, and fate of dissolved inorganic N in a sandy aquifer near La Pine, Oregon. NO 3 is a common contaminant in shallow ground water in this area, whereas high concentrations of NH 4 -N (up to 39 mg/L) are present in deep ground water. N concentrations, N/Cl ratios, tracer-based apparent ground-water ages, N isotope data, and hydraulic gradients indicate that septic tank effluent is the primary source of NO 3 . N isotope data, N/Cl and N/C relations, 3H data, and hydraulic considerations point to a natural, sedimentary organic matter source for the high concentrations of NH 4 , and are inconsistent with an origin as septic tank N. Low recharge rates and flow velocities have largely restricted anthropogenic NO 3 to isolated plumes within several meters of the water table. A variety of geochemical and isotopic data indicate that denitrification also affects NO 3 gradients in the aquifer. Ground water in the La Pine aquifer evolves from oxic to increasingly reduced conditions. Suboxic conditions are achieved after about 15-30 y of transport below the water table. This article is a U.S. government work, and is not subject to copyright in the United States.denitrified near the oxic/suboxic boundary. Denitrification in the La Pine aquifer is characterized well at the aquifer scale with a redox boundary approach that inherently captures spatial variability in the distribution of electron donors. ª

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Section: Usgs Samplesmentioning

confidence: 99%

Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA

Hinkle

Böhlke

Duff

et al. 2007

Journal of Hydrology

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“…At the NWQL, samples were analyzed to determine the concentrations of seven nutrient compounds (table 2) using colorimetry as described by Patton and Truitt (1992) and Fishman (1993). Chlorophyll a analyses were done by the USGS in Mounds View, Minnesota using USEPA method 445 (U.S. Environmental Protection Agency, 1992).…”

Section: Sample Collection and Analytical Methodsmentioning

confidence: 99%

Water-quality assessment of part of the Upper Mississippi River Basin Study Unit, Minnesota and Wisconsin — Nutrients, chlorophyll a, phytoplankton, and suspended sediment in streams, 1996-98

2003

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FOREWORDThe U.S. Geological Survey (USGS) is committed to serve the Nation with accurate and timely scientific information that helps enhance and protect the overall quality of life, and facilitates effective management of water, biological, energy, and mineral resources, (http://www.usgs.gov/). Information dn the quality of the Nation's water resources is of critical interest to the USGS because it is so integrally linked to the long-term availability of water that is clean and safe for drinking and recreation and that is suitable for industry, irrigation, and habitat for fish and wildlife. Escalating population growth and increasing demands for the multiple water uses make water availability, now measured in terms of quantity and quality, even more critical to the long-term sustainability of our communities and ecosystems.The USGS implemented the National Water-Quality Assessment (NAWQA) Program to support national, regional, and local information needs and decisions related to waterquality management and policy, (http://water.usgs.gov/nawqa/). Shaped by and coordinated with ongoing efforts of other Federal, State, and local agencies, the NAWQA Program is designed to answer: What is the condition of our Nation's streams and ground water? How are the conditions changing over time? How do natural features and human activities affect the quality of streams and ground water, and where are those effects most pronounced? By combining information on water chemistry, physical characteristics, stream habitat, and aquatic life, the NAWQA Program aims to provide science-based insights for current and emerging water issues and priorities. NAWQA results can contribute to informed decisions that result in practical and effective water-resource management and strategies that protect and restore water quality.Since 1991, the NAWQA Program has implemented interdisciplinary assessments in more than 50 of the Nation's most important river basins and aquifers, referred to as Study Units, (http://water.usgs.gov/nawqa/nawqamap.html). Collectively, these Study Units account for more than 60 percent of the overall water use and population served by public water supply, and are representative of the Nation's major hydrologic landscapes, priority ecological resources, and agricultural, urban, and natural sources of contamination.Each assessment is guided by a nationally consistent study design and methods of sampling and analysis. The assessments thereby build local knowledge about water-quality issues and trends in a particular stream or aquifer while providing an understanding of how and why water quality varies regionally and nationally. The consistent, multi-scale approach helps to determine if certain types of water-quality issues are isolated or pervasive, and allows direct comparisons of how human activities and natural processes affect water quality and ecological health in the Nation's diverse geographic and environmental settings. Comprehensive assessments on pesticides, nutrients, volatile organic compounds, trace metals, an...

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“…Nutrient and pesticide samples were preserved and chilled immediately after filtration and then shipped overnight to the NWQL in Denver, Colo. Samples were analyzed using methods for NAWQA described in Patton and Truitt (1992), Fishman (1993), Zaugg and others (1995), or Werner and others (1996). Statistically significant differences in constituent concentrations between sampling sites, land covers, and seasons were tested using the Tukey's test on the rank-transformed data.…”

Section: Methodsmentioning

confidence: 99%

Spatial and seasonal variability of nutrients, pesticides, bacteria, and suspended sediment in the Santee River basin and coastal drainages, North and South Carolina, 1995-97

Maluk¹

2000

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Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of the total phosphorus by a Kjeldahl digestion method and an automated colorimetric finish that includes dialysis

Cited by 171 publications

References 4 publications

Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA

Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA

Water-quality assessment of part of the Upper Mississippi River Basin Study Unit, Minnesota and Wisconsin — Nutrients, chlorophyll a, phytoplankton, and suspended sediment in streams, 1996-98

Spatial and seasonal variability of nutrients, pesticides, bacteria, and suspended sediment in the Santee River basin and coastal drainages, North and South Carolina, 1995-97

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