Postflood Occurrence of Selected Agricultural Chemicals and Volatile Organic Compounds in Near-surface Unconsolidated Aquifers in the Upper Mississippi River Basin, 1993

Postflood Occurrence of Selected Agricultural Chemicals and Volatile Organic Compounds in Near-surface Unconsolidated Aquifers in the Upper Mississippi River Basin, 1993 PDF Author: Dana W. Kolpin
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ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 32

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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

Postflood Occurrence of Selected Agricultural Chemicals and Volatile Organic Compounds in Near-surface Unconsolidated Aquifers in the Upper Mississippi River Basin, 1993 PDF Author: Dana W. Kolpin
Publisher:
ISBN:
Category : Agricultural chemicals
Languages : en
Pages : 32

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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

U.S. Geological Survey Circular PDF Author:
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Category : Geology
Languages : en
Pages : 300

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Occurrence and Transport of Agricultural Chemicals in the Mississippi River Basin, July Through August 1993

Occurrence and Transport of Agricultural Chemicals in the Mississippi River Basin, July Through August 1993 PDF Author: Charles A. Perry
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Category : Agricultural chemicals
Languages : en
Pages : 300

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Herbicides in Ground Water of the Midwest

Herbicides in Ground Water of the Midwest PDF Author:
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Category : Groundwater
Languages : en
Pages : 4

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Fact Sheet

Fact Sheet PDF Author:
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Category : Geological mapping
Languages : en
Pages : 618

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Monthly Catalogue, United States Public Documents

Monthly Catalogue, United States Public Documents PDF Author:
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Category : Government publications
Languages : en
Pages : 1040

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Monthly Catalog of United States Government Publications

Monthly Catalog of United States Government Publications PDF Author:
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Category : Government publications
Languages : en
Pages : 1038

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Publications of the Geological Survey

Publications of the Geological Survey PDF Author: Geological Survey (U.S.)
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Category : Geology
Languages : en
Pages : 508

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Distribution of Major Herbicides in Ground Water of the United States

Distribution of Major Herbicides in Ground Water of the United States PDF Author:
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Category : Herbicides
Languages : en
Pages : 72

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Water-resources Investigations Report

Water-resources Investigations Report PDF Author:
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Category : Hydrology
Languages : en
Pages : 284

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