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Articles 391 - 420 of 1095

Full-Text Articles in Fresh Water Studies

Osmb Final Report: Task 3. Containment Strategies For Eurasian Watermilfoil Infested Central Or Lakes, Vanessa Morgan, Mark Sytsma Jan 2014

Osmb Final Report: Task 3. Containment Strategies For Eurasian Watermilfoil Infested Central Or Lakes, Vanessa Morgan, Mark Sytsma

Center for Lakes and Reservoirs Publications and Presentations

In recent years, public awareness of aquatic invasive species (AIS) has increased considerably in Oregon and elsewhere in the western U.S.. News articles, boat inspection stations and AIS permit programs have drawn attention to the threat of aquatic invasive species, especially animals like zebra mussels (Dreissena polymorpha), quagga mussels (Dreissena bugensis), and New Zealand mudsnails (Potamopyrgus antipodarum). However, invasive aquatic plants are also capable of causing severe impacts and may similarly be transferred between waterbodies on boats, trailers or other equipment. Heavy infestations can hinder recreational use by motorized and non-motorized boats, snag fishing lines, threaten the safety of swimmers …


Osmb Final Report: Task 6. Tenmile Lake Boat Wash Effectiveness Monitoring, Samuel Cimino, Angela L. Strecker Jan 2014

Osmb Final Report: Task 6. Tenmile Lake Boat Wash Effectiveness Monitoring, Samuel Cimino, Angela L. Strecker

Center for Lakes and Reservoirs Publications and Presentations

Public awareness of aquatic invasive species and proper boat cleaning procedures may prove to be beneficial in reducing the transport and establishment of aquatic invasive species like New Zealand mud snails and zebra and quagga mussels as well as hydrilla and Eurasian watermilfoil. The primary objectives of this research project were to observe the use and determine the efficacy of a public boat wash station as well as increase the public’s awareness of proper boat cleaning procedures and aquatic invasive species. The Tenmile Lakes Basin Partnership, Oregon State Marine Board, and the United States Forest Service (USFS) have undertaken an …


Scenario Development And Analysis Of Freshwater Ecosystem Services Under Land Cover And Climate Change In The Tualatin And Yamhill River Basins, Oregon, Robert Wesley Hoyer Dec 2013

Scenario Development And Analysis Of Freshwater Ecosystem Services Under Land Cover And Climate Change In The Tualatin And Yamhill River Basins, Oregon, Robert Wesley Hoyer

Dissertations and Theses

Humans make decisions within ecosystems to enhance their well-being, but choices can lead to unintended consequences. The ecosystem services (ES) approach supports decision-making that considers all environmental goods and services. Many challenges remain in the implementation of the ES approach like how specific ES vary through space and time. We address this research problem using the Tualatin and Yamhill river basins in northwestern Oregon as a study area. Freshwater ES are quantified and mapped with the spatially-explicit ES modeling tool, Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST). In chapter II, we develop a simple urban land cover change modeling …


Water Quality Monitoring For Selected Priority Watersheds In Arkansas, Upper Saline, Poteau And Strawberry Rivers, L. B. Massey, J.A. Mccarty, M.D. Matlock, A.N. Sharpley, B.E. Haggard Dec 2013

Water Quality Monitoring For Selected Priority Watersheds In Arkansas, Upper Saline, Poteau And Strawberry Rivers, L. B. Massey, J.A. Mccarty, M.D. Matlock, A.N. Sharpley, B.E. Haggard

Arkansas Water Resources Center Technical Reports

Arkansas Natural Resources Commission has identified three priority hydrological unit code (HUC) 8 watersheds, the Upper Saline (HUC 08040203), Poteau (HUC 11110105), and Strawberry Watersheds (HUC 11010012). SWAT models have been developed to estimate nutrient and sediment loads in these watersheds where limited water‐quality data was available. The purpose of this project was to collect additional water samples across these HUC 8 watersheds to better understand how water quality changes across subwatershed with differing land use mixes, as well as estimate nitrate‐nitrogen (NO3‐N), total phosphorus (TP), and total suspended sediment (TSS) loads. Water samples were collected at twenty sites near …


Umphlett Qci Dec 2013, Natalie A. Umphlett Dec 2013

Umphlett Qci Dec 2013, Natalie A. Umphlett

High Plains Regional Climate Center: Staff Publications

Highlights for the Basin

Temperature and Precipitation Anomalies

Soil Moisture

September Flooding in Colorado

Early October Blizzard

3-Month Precipitation and Temperature Outlooks

U.S. Seasonal Drought Outlook


Reservoir Management Techniques To Enhance Biological Productivity And Protect Water Quality, Ben Alan Thompson Dec 2013

Reservoir Management Techniques To Enhance Biological Productivity And Protect Water Quality, Ben Alan Thompson

Graduate Theses and Dissertations

Three reservoirs of similar size, watershed land use, and qualitative characteristics in northwest Arkansas, USA were selected to compare the effects of chemical fertilization and pulsed artificial-upwelling on whole-lake productivity, specifically primary production and phytoplankton biomass. Numerous water quality parameters were quantified over a two year period (2011-13) with the goal of understanding how each management technique would stimulate productivity. This experiment was the first step towards a larger goal to ultimately enhance sport fish production. The first year of monitoring occurred in 2011 and served as a control year for the three lakes. Treatments were initiated in two of …


Droughtscape, Fall 2013, National Drought Mitigation Center Oct 2013

Droughtscape, Fall 2013, National Drought Mitigation Center

DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)

Contents

Director’s report

Kansas community drought planning workshop November 5

Drought impacts webinars

Drought outlook and summary

Late summer drought brings more agricultural impacts

Plans help ranchers weather drought

NDMC contributions to U2U project

Drought Management Database archives strategies

QuickDRI will help spot flash droughts

NDMC Co-Hosts NASA workshop

Wilhite leads Integrated Drought Management Program work

Speaking of drought

Managing #Drought tweet chat transcript

Updated USDM website


Oregon Dreissenid Mussel: Rapid Response Plan, Robyn Draheim, Rick Boatner, Glenn Dolphin, Lisa Debruyckere Oct 2013

Oregon Dreissenid Mussel: Rapid Response Plan, Robyn Draheim, Rick Boatner, Glenn Dolphin, Lisa Debruyckere

Center for Lakes and Reservoirs Publications and Presentations

In 2007, both zebra mussels (Dreissena polymorpha) and quagga mussels (Dreissena rostriformis bugensis) were found to have established populations west of the Rocky Mountains. The risk posed to the Pacific Northwest by the proximity of these new infestations is significant. This plan was developed in response to the increasing likelihood of the successful transport and introduction of these species into the State of Oregon and Pacific Northwest. Although prevention remains the most cost-effective means of addressing potential infestations of aquatic invasive species, if prevention efforts fail, the State of Oregon must be prepared to respond rapidly …


Issue Brief: Saving By Mitigating, University Of Louisville, New England Environmental Finance Center Sep 2013

Issue Brief: Saving By Mitigating, University Of Louisville, New England Environmental Finance Center

Sustainable Communities Capacity Building

Natural disasters can cause loss of life, inflict damage to buildings and infrastructure, and have devastating consequences for a community’s economic, social, and environmental well-being. Hazard mitigation means reducing damages from disasters.

Local governments have the responsibility to protect the health, safety, and welfare of their citizens. Proactive mitigation policies and actions help reduce risk and create safer, more disaster-resilient communities. Mitigation is an investment in your community’s future safety, equity, and sustainability.


Climate Change On The Prairie: A Basic Guide To Climate Change In The High Plains Region - Update, Lincoln, Ne Aug 2013

Climate Change On The Prairie: A Basic Guide To Climate Change In The High Plains Region - Update, Lincoln, Ne

High Plains Regional Climate Center: Staff Publications

Global Climate Change

Climate Change in the United States

Historical Climate Trends in the High Plains Region

Historical Climate Trends in the High Plains Region

High Plains Region Update: 2010-2012

New Tool: Climate Impact Reporter

Climate Change Projections and Possible Impacts

Climate Change Projections and Possible Impacts


Understanding Basin Specific Life History Characteristics Of Lake Mead Quagga Mussels (Dreissena Bugensis) And A Potential Treatment Using Uv Radiation In Laboratory Studies, Melissa Thaw Aug 2013

Understanding Basin Specific Life History Characteristics Of Lake Mead Quagga Mussels (Dreissena Bugensis) And A Potential Treatment Using Uv Radiation In Laboratory Studies, Melissa Thaw

UNLV Theses, Dissertations, Professional Papers, and Capstones

The quagga mussel (Dreissena bugensis) is an aquatic invasive species that is spreading throughout Lake Mead and other western waterways. Unlike their native waters in Eurasia, Lake Mead exhibits year round warm temperatures, high calcium levels and a lack of natural predators, all of which are very favorable conditions for their growth and spread. Dreissena bugensis reproduce and colonize hard surfaces rapidly, where they filter large amounts of water. They disrupt the aquatic food chain and interfere with infrastructure that is exposed to lake water. There is an urgent need to understand Dreissena bugensis life history characteristics within this new …


Droughtscape, Summer 2013, National Drought Mitigation Center Jul 2013

Droughtscape, Summer 2013, National Drought Mitigation Center

DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)

Contents

Director’s report

July 25 webinar: Drought management database, NIDIS update

Republican River Basin workshops July 31, August 1

Summer climate outlook, spring summary

Spring impacts: wildfire, water, agriculture and business

Data help managers assess Nebraska groundwater declines after drought of 2012

Tadesse helps Mexico with Veg-DRI concept

Visiting scholar explores remote sensing of drought in forests

U.S. Drought Monitor Forum photo recap, details online

Workshop helps New Mexico ranchers cope with drought

Alabama’s new drought plan

National Drought Forum report

Drought Impacts Community of Practice report


Evaluating The Contribution Of Groundwater To Wetland Water Budgets Central Piedmont Virginia, Kerby Morgan Dobbs Jul 2013

Evaluating The Contribution Of Groundwater To Wetland Water Budgets Central Piedmont Virginia, Kerby Morgan Dobbs

OES Theses and Dissertations

In the Piedmont region of Virginia, development pressures are increasing the demand for mitigation wetlands but appropriate construction sites are relatively scarce due to local topography and geology. Many existing water budget models used for planned mitigation sites exhibit considerable error when estimating groundwater fluxes, particularly for historical years that lack hydraulic head data. This difficulty has led many planners to neglect or underestimate the contribution of groundwater to wetland water budgets, resulting in mitigation sites that fail to create the appropriate hydrology for the desired vegetation community. However, reliable estimations of groundwater input contributing to wetland water budgets can …


Ecological Design In The Ozarks - Workshop And Lake Frances Charrette, Steven D. Patterson, Brian E. Haggard, Mark E. Boyer May 2013

Ecological Design In The Ozarks - Workshop And Lake Frances Charrette, Steven D. Patterson, Brian E. Haggard, Mark E. Boyer

Arkansas Water Resources Center Technical Reports

No abstract provided.


A Cradle To Farm Gate Life Cycle Analysis Of Water Use In U.S. Pork Production, Eric Boles May 2013

A Cradle To Farm Gate Life Cycle Analysis Of Water Use In U.S. Pork Production, Eric Boles

Graduate Theses and Dissertations

The intent of this study was to analyze water use across a range of regions, scales and practices of the U.S. pork industry. A Life Cycle Assessment of water use within the pork supply chain was performed. Cumulative water use was the environmental impact category used in the LCA to evaluate the impacts of pork production processes throughout the pork supply chain. The functional unit for the analysis was the volume of water required to produce one kilogram of swine (live weight) at the farm gate.

A comprehensive literature review was used to design and propagate algorithms for the National …


Century Wide Hydrologic Trends And Shifts In Colorado River Basin, Soumya Sagarika, Ajay Kalra, Sajjad Ahmad Apr 2013

Century Wide Hydrologic Trends And Shifts In Colorado River Basin, Soumya Sagarika, Ajay Kalra, Sajjad Ahmad

College of Engineering: Graduate Celebration Programs

To evaluate the long-term trends and step (abrupt change) changes in three hydrologic variables: temperature, precipitation, and streamflow over a century wide time frame in Colorado River Basin.


Effects Of Hru Size On Prms Performance In 30 Western U.S. Basins, Madeline Olena Steele Apr 2013

Effects Of Hru Size On Prms Performance In 30 Western U.S. Basins, Madeline Olena Steele

Dissertations and Theses

Semi-distributed hydrological models are often used for streamflow forecasting, hydrological climate change impact assessments, and other applications. In such models, basins are broken up into hydrologic response units (HRUs), which are assumed to have a relatively homogenous response to precipitation. HRUs are delineated in a variety of ways, and the procedure used may impact model performance. HRU delineation procedures have been researched, but it is still not clear how important these subdivision schemes are or which delineation methods are most effective. To start addressing this knowledge gap, this project investigated whether or not HRU size has a significant effect on …


Droughtscape, Spring 2013, National Drought Mitigation Center Apr 2013

Droughtscape, Spring 2013, National Drought Mitigation Center

DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)

Contents

Director’s report

First quarter climate summary and outlook

Impacts: Crop indemnities set records in 2012; water conflicts escalating

International meeting recommends countries have drought policies

NDMC plays key role in international drought policy meeting

EDEN and VOAD guide helps build community drought capacity

Svoboda, other experts and policymakers focus on food and water security

New Mexico ranching workshop set for May 29 in Socorro

Ranch planning updates: archived webinars, new publications

Tune in to the US Drought Monitor Forum, April 16-18

Archived webinar looks at using drought simulations in planning

CoCoRaHS WxTalk on drought


Aquatic Invasive Plant Surveys In The Blm Medford District During 2012, Rich Miller, Vanessa Morgan, Mark D. Sytsma Apr 2013

Aquatic Invasive Plant Surveys In The Blm Medford District During 2012, Rich Miller, Vanessa Morgan, Mark D. Sytsma

Center for Lakes and Reservoirs Publications and Presentations

Aquatic plant surveys were conducted at 22 waterbodies located within the Bureau of Land Management’s Medford District during the summer of 2012. Sites included eleven lakes, ponds or reservoirs and six reaches along the Rogue and Applegate Rivers. Five sampling areas surveyed during 2010 and 2011 were revisited to determine the extent of known non-native species infestations, positively identify rare species, or verify the absence of an expected non-native species. Plant specimens were collected at up to 50 sites at each waterbody using plant rakes or by observation. The non-native submersed species curly leaf pondweed (Potamogeton crispus) and …


Aquatic Invasive Species Surveys Of Upper Klamath Lake, Fourmile Lake, And Lake Of The Woods, Or During 2012, Rich Miller, Mark D. Sytsma Mar 2013

Aquatic Invasive Species Surveys Of Upper Klamath Lake, Fourmile Lake, And Lake Of The Woods, Or During 2012, Rich Miller, Mark D. Sytsma

Center for Lakes and Reservoirs Publications and Presentations

Three lakes located within the Klamath River Basin in Oregon (Upper Klamath Lake, Fourmile Lake, and Lake of the Woods) were surveyed for aquatic invasive species during the summer of 2012. Specimens were collected using plant rakes, benthic dredges, plankton nets, and crayfish traps. No invasive aquatic plants, gastropods, snails, bivalves or crayfish were detected in the lakes.


Estimating Greenhouse Gas Emissions From A Waste Lagoon, Arturo I. Quintanar, Rezaul Mamood, Nanh Lovanh, Justin M. Rawley, Evi Becerra-Acosta, John H. Loughrin Jan 2013

Estimating Greenhouse Gas Emissions From A Waste Lagoon, Arturo I. Quintanar, Rezaul Mamood, Nanh Lovanh, Justin M. Rawley, Evi Becerra-Acosta, John H. Loughrin

High Plains Regional Climate Center: Staff Publications

A cost-effective approach was used to investigate the relationship between emission of the greenhouse gases (GHG), namely, CO2, CH4, and N2O and energy fluxes from a swine waste lagoon. Energy fluxes were calculated using the Penman method. The energy fluxes showed a diurnal pattern as expected of such fluxes. We found that air temperature and latent energy, lagoon surface temperature and solar radiation, as well as air temperature and wind speed can be used to predict for CO2, CH4, and N2O emissions, respectively. Comparison of observed and predicted …


Regional Climate Trends And Scenarios For The U.S. National Climate Assessment Part 4. Climate Of The U.S. Great Plains, Kenneth E. Kunkel, Laura E. Stevens, Scott E. Stevens, Liqiang Sun, Emily Janssen, Donald Wuebbles, Michael C. Kruk, Devin Thomas, Martha Shulski, Natalie A. Umphlett, Kenneth G. Hubbard, Kevin Robbins, Luigi Romolo, Adnan Akyuz, Tapan B. Pathak, Tony R. Bergantino, J. Greg Dobson Jan 2013

Regional Climate Trends And Scenarios For The U.S. National Climate Assessment Part 4. Climate Of The U.S. Great Plains, Kenneth E. Kunkel, Laura E. Stevens, Scott E. Stevens, Liqiang Sun, Emily Janssen, Donald Wuebbles, Michael C. Kruk, Devin Thomas, Martha Shulski, Natalie A. Umphlett, Kenneth G. Hubbard, Kevin Robbins, Luigi Romolo, Adnan Akyuz, Tapan B. Pathak, Tony R. Bergantino, J. Greg Dobson

High Plains Regional Climate Center: Staff Publications

This document is one of series of regional climate descriptions designed to provide input that can be used in the development of the National Climate Assessment (NCA). As part of a sustained assessment approach, it is intended that these documents will be updated as new and well-vetted model results are available and as new climate scenario needs become clear. It is also hoped that these documents (and associated data and resources) are of direct benefit to decision makers and communities seeking to use this information in developing adaptation plans.

There are nine reports in this series, one each for eight …


Emergent Sandbar Dynamics In The Lower Platte River In Eastern Nebraska: Methods And Results Of Pilot Study, 2011, Jason S. Alexander, Devin M. Schultze, Ronald B. Zelt Jan 2013

Emergent Sandbar Dynamics In The Lower Platte River In Eastern Nebraska: Methods And Results Of Pilot Study, 2011, Jason S. Alexander, Devin M. Schultze, Ronald B. Zelt

United States Geological Survey: Water Reports and Publications

The lower Platte River corridor provides important habitats for two State- and federally listed bird species: the interior least tern (terns; Sternula antillarum athallassos) and the piping plover (plovers; Charadrius melodus). However, many of the natural morphological and hydrological characteristics of the Platte River have been altered substantially by water development, channelization, hydropower operations, and invasive vegetation encroachment, which have decreased the abundance of high-quality nesting and foraging habitat for terns and plovers. The lower Platte River (LPR), defined as 103 miles (mi) of the Platte River between its confluence with the Loup River and its confluence with the Missouri …


Comparison Of Water Consumption In Two Riparian Vegetation Communities Along The Central Platte River, Nebraska, 2008–09 And 2011, Brent M. Hall, David L. Rus Jan 2013

Comparison Of Water Consumption In Two Riparian Vegetation Communities Along The Central Platte River, Nebraska, 2008–09 And 2011, Brent M. Hall, David L. Rus

United States Geological Survey: Water Reports and Publications

The Platte River is a vital natural resource for the people, plants, and animals of Nebraska. A recent study quantified water use by riparian woodlands along central reaches of the Platte River, Nebraska, finding that water use was mainly regulated below maximum predicted levels. A comparative study was launched through a cooperative partnership between the United States Geological Survey (USGS), the Central Platte Natural Resources District, the Nebraska Department of Natural Resources, and the Nebraska Environmental Trust to compare water use of a riparian woodland with that of a grazed riparian grassland along the central Platte River. This report describes …


Hydrographic Surveys Of The Missouri And Yellowstone Rivers At Selected Bridges And Through Bismarck, North Dakota, During The 2011 Flood, Brenda K. Densmore, Kellan R. Strauch, Benjamin J. Dietsch Jan 2013

Hydrographic Surveys Of The Missouri And Yellowstone Rivers At Selected Bridges And Through Bismarck, North Dakota, During The 2011 Flood, Brenda K. Densmore, Kellan R. Strauch, Benjamin J. Dietsch

United States Geological Survey: Water Reports and Publications

The United States Geological Survey (USGS), in cooperation with the North Dakota Department of Transportation and the North Dakota State Water Commission, completed hydrographic surveys at six Missouri River bridges and one Yellowstone River bridge during the 2011 flood of the Missouri River system. Bridges surveyed are located near the cities of Cartwright, Buford, Williston, Washburn, and Bismarck, N. Dak. The river in the vicinity of the bridges and the channel through the city of Bismarck, N. Dak., were surveyed. The hydrographic surveys were conducted using a high-resolution multibeam echosounder (MBES), the RESON SeaBatTM 7125, during June 6–9 and June …


Hydrographic Surveys Of Four Narrows Within The Namakan Reservoir System, Voyageurs National Park, Minnesota, 2011, Brenda K. Densmore, Kellan R. Strauch, Jeffrey R. Kiegweid Jan 2013

Hydrographic Surveys Of Four Narrows Within The Namakan Reservoir System, Voyageurs National Park, Minnesota, 2011, Brenda K. Densmore, Kellan R. Strauch, Jeffrey R. Kiegweid

United States Geological Survey: Water Reports and Publications

The United States Geological Survey (USGS) performed multibeam echosounder hydrographic surveys of four narrows in the Namakan reservoir system in August 2011, in cooperation with the International Joint Commission and Environment Canada. The data-collection effort was completed to provide updated and detailed hydrographic data to Environment Canada for inclusion in a Hydrologic Engineering Centers River Analysis System hydraulic model. The Namakan reservoir system is composed of Namakan, Kabetogama, Sand Point, Crane, and Little Vermilion Lakes. Water elevations in the Namakan reservoir system are regulated according to rule curves, or guidelines for water-level management based on the time of year, established …


Droughtscape, Winter 2013, Kelly Smith Jan 2013

Droughtscape, Winter 2013, Kelly Smith

DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)

Contents

Director’s report

Climatological overview of drought in 2012

Climatological overview of drought, October-December 2012

Impacts of drought in 2012

Drought planning webinars scheduled for ranch advisors

UNL honors NDMC for exceptional service

Report from the emerging community of drought planners

Feb. 6 webinar on drought simulations

Climate Masters course starting

Climate Change in the Midwest book includes drought

Video highlights from coverage of drought of 2012

U.S. Drought Monitor Forum 2013

UN’s High Level Meeting on National Drought Policy

NDMC collaboration with India, Czech Republic


Occurrence Of Antimicrobials And Antimicrobial Resistance Genes In Beef Cattle Storage Ponds And Swine Treatment Lagoons, Yuping Zhang, Chiqian Zhang, David B. Parker, Daniel D. Snow, Zhi Zhou, Xu Li Jan 2013

Occurrence Of Antimicrobials And Antimicrobial Resistance Genes In Beef Cattle Storage Ponds And Swine Treatment Lagoons, Yuping Zhang, Chiqian Zhang, David B. Parker, Daniel D. Snow, Zhi Zhou, Xu Li

Nebraska Water Center: Faculty Publications

Livestock manure treatment and storage structures are potential environmental sources of antimicrobials and antimicrobial resistance genes (ARGs). In this study, the occurrence of antimicrobials and ARGs was investigated in the water and the sludge compartments of beef cattle storage ponds and swine lagoons. Analysis was focused on two families of antimicrobials (sulfonamide and tetracycline) and the corresponding ARGs (sul1, sul2, tetO, tetQ and tetX). Results showed that the pseudo-partitioning coefficients of tetracyclines were higher than those of sulfonamides, suggesting different distributions of these two classes of antimicrobials between water and sludge. The ARGs tested were …


Climate Change: What Does It Mean For Nebraska?, Martha D. Shulski, Natalie A. Umphlett, Tapan B. Pathak, Kenneth G. Hubbard Jan 2013

Climate Change: What Does It Mean For Nebraska?, Martha D. Shulski, Natalie A. Umphlett, Tapan B. Pathak, Kenneth G. Hubbard

High Plains Regional Climate Center: Staff Publications

Because Nebraska’s location on the North American continent is far removed from large bodies of water, Nebraskans experience a strong continental type climate. As such, residents do not benefit from the moderating influence of the ocean, and temperatures can have wide swings from day to day and season to season. Typical characteristics for a continental climate at this latitude are large temperature variability with warm summers dominated by convective thunderstorms, and cold winters influenced by snow and wind from mid-latitude cyclones.


Assessing Total Nitrogen In Surface-Water Samples: Precision And Bias Of Analytical And Computational Methods, David L. Rus, Charles J. Patton, David K. Mueller, Charles G. Crawford Jan 2013

Assessing Total Nitrogen In Surface-Water Samples: Precision And Bias Of Analytical And Computational Methods, David L. Rus, Charles J. Patton, David K. Mueller, Charles G. Crawford

United States Geological Survey: Water Reports and Publications

The characterization of total-nitrogen (TN) concentrations is an important component of many surface-water-quality programs. However, three widely used methods for the determination of total nitrogen—(1) derived from the alkaline-persulfate digestion of whole-water samples (TN-A); (2) calculated as the sum of total Kjeldahl nitrogen and dissolved nitrate plus nitrite (TN-K); and (3) calculated as the sum of dissolved nitrogen and particulate nitrogen (TN-C)—all include inherent limitations. A digestion process is intended to convert multiple species of nitrogen that are present in the sample into one measureable species, but this process may introduce bias. TN-A results can be negatively biased in the …