Search Results for the EPA National Library Catalog

Items Found: 105

Showing: Items 51 - 100

Your Search: (SUBJECT=Water Nitrogen content)


Select Item Title Year Published
Nitrogen and phosphorus determinations in estuarine waters : a comparison of methods used in Chesapeake Bay monitoring / 1987
Nitrogen concentrations and deposition in rainfall at two sites in the Coastal Bend area, South Texas, 1996-98 1999
Nitrogen in ground water and surface water from sewered and unsewered areas, Nassau County, Long Island, New York 1980
Nitrogen in the environment : sources, impacts, management / 1993
Nitrogen loadings from agricultural activities in the Great Lakes Basin : integration report on nitrogen agricultural watershed studies / 1978
Nitrogen management in agriculture and water quality. 1989
Nitrogen removal from wastewaters. 1970
Nitrogen source differentiation through carbon isotopes technical completion report / 1977
Nitrogen sources and cycling in natural waters / 1973
Nitrogen transport and transformations in Canagagigue Creek : final report project 19A, agricultural watershed studies / 1978
Nitrogen, phosphorus, and carbon flux in Chesapeake Bay marshes 1976
Nonpoint and point sources of nitrogen in major watersheds of the United States / 1994
Nonpoint and point sources of nitrogen in major watersheds of the United States : introduction / 1994
Nonpoint source -- stream nutrient level relationships : a nationwide study / 1977
Nutrient concentrations, loads, and yields in the Eucha-Spavinaw Basin, Arkansas and Oklahoma, 2002-2004 / 2006
Nutrient inputs to a lake and their effects upon water quality / 1974
Nutrients in the nation's streams and groundwater, 1992-2004 / 2010
Occurrence and formation of nitrogenous disinfection by-products / 2009
Occurrence of nitrate, pesticides, and volatile organic compounds in the Kirkwood-Cohansey Aquifer system, southern New Jersey 1997
Occurrence of phosphorus, nitrate, and suspended solids in streams of the Cheney Reservoir Watershed, south-central Kansas, 1997-2000 2001
Organic nitrogen in drinking water and reclaimed waste water / 2006
Patterns and processes of variation in nitrogen and phosphorus concentrations in forested streams 2001
Percentile distributions of median nitrite plus nitrate as nitrogen, total nitrogen, and total phosphorus concentrations in Oklahoma streams, 1973-2001 2003
Phase III actions for hypoxia management / 1998
Physical and chemical removal of nutrients 1968
Plan of study to determine if the isotopic ratios {delta} 15N and {delta} 18O can reveal the sources of nitrate discharged by the Mississippi River into the Gulf of Mexico 1997
PLUARG task C study on runoff sediment, total phosphorus filtered reactive phosphorus, (nitrate + nitrite) nitrogen, and ammonium nitrogen -- Maumee River basin / 1978
Preservation of wastewater effluent samples for forms of nitrogen and phosphorus / 1975
Proceedings : IAWPR specialized conference, Copenhagen, Denmark, 18-20th August, 1975. 1975
Process design manual for nitrogen control / 1975
Protocol for evaluating the nitrogen status of lake sediments / 1974
Relation between nitrate in water wells and potential sources in the lower Yakima Valley, Washington / 2013
Relation between nitrate in water wells and potential sources in the lower Yakima valley, Washington / 2012
Relation of land use to nitrogen concentration in ground water in the Patuxent River Basin, Maryland / 1995
Report on sediment and nutrient loading goals study 1986
Report to U.S. Public Health Service Region IX, Water Supply and Pollution Control Division on a study of methods suitable for the analysis and preservation of nitrogen forms in an estuarine environment. 1965
Results of lead time studies of baseline chemical nutrients in Lake George and Nitrogen cycles in the Lake George ecosystem 1971
Review and synthesis of available information to estimate human impacts to dissolved oxygen in Hood Canal / 2013
Source apportionment of nitrogen and phosphorus inputs into the aquatic environment 2005
Sources and sinks of nitrogen and phosphorus : water quality management of Lake George (N.Y.) / 1972
Sources of nitrogen and phosphorus in the Lake George drainage basin: a double lake / 1973
Spatial and temporal resource allocation methods for agricultural watershed planning : thesis / 1973
Studies of the agricultural contribution to nitrate enrichment of groundwater and the subsequent loading to surface waters / 1978
Studies on effects of supersaturation of dissolved gases on fish : Final report / 1975
The dilution/flushing technique in lake restoration / 1981
The Drinking water criteria document on nitrate/nitrite / 1990
The fate and effects of nitrogen and phosphorus enrichment in shallow ponds / 2001
The Relationships of phosphorus and nitrogen to the trophic state of northeast and north-central lakes and reservoirs : preliminary analysis of National Eutrophication Survey data collected during the 1972-73 sampling period. 1974
The role of nitrogen in the acidification of soils and surface waters / 1989
The role of nitrogen in the aquatic environment / 1972

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