Author: Dana W. Kolpin
Publisher:
ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 32
Book Description
The historic stream flooding and intense rainfall across the upper Mississippi River Basin during summer 1993 had an immediate effect on near-surface unconsolidated aquifers by raising the water levels closer to the land surface. The objective of this study was to determine if this flooding also had immediate effects on ground-water quality. Water samples were collected during September and October 1993 from 110 wells completed in near-surface unconsolidated aquifers and were analyzed for herbicides, herbicide metabolites, inorganic nutrients, and volatile organic compounds. The results of these samples were compared with those obtained during summer 1991 or 1992. Water samples from the Missouri River alluvial aquifer had a fourfold increase in the frequency of herbicide detection. There also appears to be a relation between increases in total herbicide concentration and the occurrence of stream flooding near a well. Water samples from wells that had at least a 20% increase in dissolved-oxygen concentration had the greatest frequency of substantial changes in total herbicide concentration and substantial increases in nitrate concentration.
Postflood Occurrence of Selected Agricultural Chemicals and Volatile Organic Compounds in Near-surface Unconsolidated Aquifers in the Upper Mississippi River Basin, 1993
Author: Dana W. Kolpin
Publisher:
ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 32
Book Description
The historic stream flooding and intense rainfall across the upper Mississippi River Basin during summer 1993 had an immediate effect on near-surface unconsolidated aquifers by raising the water levels closer to the land surface. The objective of this study was to determine if this flooding also had immediate effects on ground-water quality. Water samples were collected during September and October 1993 from 110 wells completed in near-surface unconsolidated aquifers and were analyzed for herbicides, herbicide metabolites, inorganic nutrients, and volatile organic compounds. The results of these samples were compared with those obtained during summer 1991 or 1992. Water samples from the Missouri River alluvial aquifer had a fourfold increase in the frequency of herbicide detection. There also appears to be a relation between increases in total herbicide concentration and the occurrence of stream flooding near a well. Water samples from wells that had at least a 20% increase in dissolved-oxygen concentration had the greatest frequency of substantial changes in total herbicide concentration and substantial increases in nitrate concentration.
Publisher:
ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 32
Book Description
The historic stream flooding and intense rainfall across the upper Mississippi River Basin during summer 1993 had an immediate effect on near-surface unconsolidated aquifers by raising the water levels closer to the land surface. The objective of this study was to determine if this flooding also had immediate effects on ground-water quality. Water samples were collected during September and October 1993 from 110 wells completed in near-surface unconsolidated aquifers and were analyzed for herbicides, herbicide metabolites, inorganic nutrients, and volatile organic compounds. The results of these samples were compared with those obtained during summer 1991 or 1992. Water samples from the Missouri River alluvial aquifer had a fourfold increase in the frequency of herbicide detection. There also appears to be a relation between increases in total herbicide concentration and the occurrence of stream flooding near a well. Water samples from wells that had at least a 20% increase in dissolved-oxygen concentration had the greatest frequency of substantial changes in total herbicide concentration and substantial increases in nitrate concentration.
U.S. Geological Survey Circular
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 300
Book Description
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 300
Book Description
Occurrence and Transport of Agricultural Chemicals in the Mississippi River Basin, July Through August 1993
Author: Charles A. Perry
Publisher:
ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 300
Book Description
Publisher:
ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 300
Book Description
Herbicides in Ground Water of the Midwest
Author:
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 4
Book Description
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 4
Book Description
Fact Sheet
Author:
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Category : Geological mapping
Languages : en
Pages : 618
Book Description
Publisher:
ISBN:
Category : Geological mapping
Languages : en
Pages : 618
Book Description
Monthly Catalogue, United States Public Documents
Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1040
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1040
Book Description
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1038
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1038
Book Description
Publications of the Geological Survey
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 508
Book Description
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 508
Book Description
Distribution of Major Herbicides in Ground Water of the United States
Author:
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 72
Book Description
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 72
Book Description
Water-resources Investigations Report
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 284
Book Description
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 284
Book Description