Stephen Kalkhoff (Former Employee)
Science and Products
Filter Total Items: 70
Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data
Water-chemistry, biological, and habitat data were collected from 70 sites on Midwestern streams during August 1997 as part of an integrated, regional water-quality assessment by the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. The study area includes the Corn Belt region of southern Minnesota, eastern Iowa, and west-central Illinois, one of the most...
Authors
S. K. Sorenson, S. D. Porter, K.B. Akers, M.A. Harris, S. J. Kalkhoff, K. E. Lee, L. Roberts, P. J. Terrio
Occurrence of acetanilide herbicide metabolites in tile runoff and ground Occurrence of acetanilide herbicide metabolites in tile runoff and ground
No abstract available.
Authors
E.M. Thurman, D.W. Kolpin, S. J. Kalkhoff, P. J. Phillips
Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters
Water samples were collected from 88 municipal wells throughout Iowa during the summer and were collected monthly at 12 stream sites in eastern Iowa from March to December 1996 to study the occurrence of the sulfonic and oxanilic metabolites of acetochlor, alachlor, and metolachlor. The sulfonic and oxanilic metabolites were present in almost 75% of the groundwater samples and were...
Authors
Stephen J. Kalkhoff, Dana W. Kolpin, E.M. Thurman, I. Ferrer, D. Barcelo
Organochlorine compounds in a sediment core from Coralville reservoir, Iowa Organochlorine compounds in a sediment core from Coralville reservoir, Iowa
No abstract available.
Authors
S. J. Kalkhoff, Peter C. Van Metre
Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995 Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995
Herbicide compounds were prevalent in ground water across Iowa, being detected in 70% of the 106 municipal wells sampled during the summer of 1995. Herbicide degradation products were three of the four most frequently detected compounds for this study. The degradation product alachlor ethanesulfonic acid was the most frequently detected compound (65.1%), followed by atrazine (40.6%), and...
Authors
D.W. Kolpin, S. J. Kalkhoff, D. A. Goolsby, D. A. Sneck-Fahrer, E.M. Thurman
Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa
An investigation to determine the relation between stream water quality and geohydrology in the Roberts Creek watershed, Clayton County, Iowa, was conducted during selected base-flow periods in 1988-90. Discharge measurements were made and water samples collected for analyses of nutrients and selected herbicides in 19 subbasins along the main stem and tributaries of Roberts Creek. The...
Authors
Stephen J. Kalkhoff
Science and Products
Filter Total Items: 70
Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data
Water-chemistry, biological, and habitat data were collected from 70 sites on Midwestern streams during August 1997 as part of an integrated, regional water-quality assessment by the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. The study area includes the Corn Belt region of southern Minnesota, eastern Iowa, and west-central Illinois, one of the most...
Authors
S. K. Sorenson, S. D. Porter, K.B. Akers, M.A. Harris, S. J. Kalkhoff, K. E. Lee, L. Roberts, P. J. Terrio
Occurrence of acetanilide herbicide metabolites in tile runoff and ground Occurrence of acetanilide herbicide metabolites in tile runoff and ground
No abstract available.
Authors
E.M. Thurman, D.W. Kolpin, S. J. Kalkhoff, P. J. Phillips
Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters
Water samples were collected from 88 municipal wells throughout Iowa during the summer and were collected monthly at 12 stream sites in eastern Iowa from March to December 1996 to study the occurrence of the sulfonic and oxanilic metabolites of acetochlor, alachlor, and metolachlor. The sulfonic and oxanilic metabolites were present in almost 75% of the groundwater samples and were...
Authors
Stephen J. Kalkhoff, Dana W. Kolpin, E.M. Thurman, I. Ferrer, D. Barcelo
Organochlorine compounds in a sediment core from Coralville reservoir, Iowa Organochlorine compounds in a sediment core from Coralville reservoir, Iowa
No abstract available.
Authors
S. J. Kalkhoff, Peter C. Van Metre
Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995 Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995
Herbicide compounds were prevalent in ground water across Iowa, being detected in 70% of the 106 municipal wells sampled during the summer of 1995. Herbicide degradation products were three of the four most frequently detected compounds for this study. The degradation product alachlor ethanesulfonic acid was the most frequently detected compound (65.1%), followed by atrazine (40.6%), and...
Authors
D.W. Kolpin, S. J. Kalkhoff, D. A. Goolsby, D. A. Sneck-Fahrer, E.M. Thurman
Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa
An investigation to determine the relation between stream water quality and geohydrology in the Roberts Creek watershed, Clayton County, Iowa, was conducted during selected base-flow periods in 1988-90. Discharge measurements were made and water samples collected for analyses of nutrients and selected herbicides in 19 subbasins along the main stem and tributaries of Roberts Creek. The...
Authors
Stephen J. Kalkhoff