Mark Sandstrom, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 53
Filtration of water-sediment samples for the determination of organic compounds
This report describes the equipment and procedures used for on-site filtration of surface-water and ground-water samples for determination of organic compounds. Glass-fiber filters and a positive displacement pumping system are suitable for processing most samples for organic analyses. An optional system that uses disposable in-line membrane filters is suitable for a specific gas chromatography/ma
Authors
Mark W. Sandstrom
Relations between pesticide use and riverine flux in the Mississippi River Basin
In an intensive subcontimental study of pesticides in surface waters of the United States, concentrations of 26 high-use pesticides were measured at nine sites in the Mississippi River basin from May 1991 through March 1992. Calculated total fluxes were combined with agricultural-use data to estimate the percentage of applied pesticide reaching the mouths of the Mississippi River and six major tri
Authors
Steven J. Larson, Paul D. Capel, Donald A. Goolsby, Steven D. Zaugg, Mark W. Sandstrom
U.S. Geological Survey laboratory method for methyl tert-butyl ether and other fuel oxygenates
Methyl tert-butyl ether (MTBE) was found in shallow ground-water samples in a study of 8 urban and 20 agricultural areas throughout the United States in 1993 and 1994 (Squillace and others, 1995, p. 1). The compound is added to gasoline either seasonally or year round in many parts of the United States to increase the octane level and to reduce carbon monoxide and ozone levels in the air.
The U
Authors
Jon W. Raese, Donna L. Rose, Mark W. Sandstrom
Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory-Determination of organonitrogen herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring
A method for the isolation of organonitrogen herbicides from natural
water samples using solid-phase extraction and analysis by capillary-column
gas chromatography/mass spectrometry with selected-ion monitoring is
described. Water samples are filtered to remove suspended particulate matter
and then are pumped through disposable solid-phase extraction cartridges
containing octadecyl-bonded por
Authors
Mark W. Sandstrom, Duane S. Wydoski, Michael P. Schroeder, Jana L. Zamboni, William T. Foreman
Modern biogenic gas-generated craters (sea-floor “pockmarks”) on the Bering Shelf, Alaska
As many as 1,340 small craters per square kilometre cover the sea floor of Norton Sound in the northeastern Bering Sea. The craters are circular pits, 1 to 10 m in diameter and less than 1 m deep, observed on sonographs over 20,000 km2 of northern Norton Sound sea floor. Craters typically are associated with acoustic anomalies, near-surface peaty mud, and gas-charged sediment.The peaty mud is a th
Authors
Nelson C. Hans, D.R. Thor, Mark W. Sandstrom, Keith A. Kvenvolden
Science and Products
Filter Total Items: 53
Filtration of water-sediment samples for the determination of organic compounds
This report describes the equipment and procedures used for on-site filtration of surface-water and ground-water samples for determination of organic compounds. Glass-fiber filters and a positive displacement pumping system are suitable for processing most samples for organic analyses. An optional system that uses disposable in-line membrane filters is suitable for a specific gas chromatography/ma
Authors
Mark W. Sandstrom
Relations between pesticide use and riverine flux in the Mississippi River Basin
In an intensive subcontimental study of pesticides in surface waters of the United States, concentrations of 26 high-use pesticides were measured at nine sites in the Mississippi River basin from May 1991 through March 1992. Calculated total fluxes were combined with agricultural-use data to estimate the percentage of applied pesticide reaching the mouths of the Mississippi River and six major tri
Authors
Steven J. Larson, Paul D. Capel, Donald A. Goolsby, Steven D. Zaugg, Mark W. Sandstrom
U.S. Geological Survey laboratory method for methyl tert-butyl ether and other fuel oxygenates
Methyl tert-butyl ether (MTBE) was found in shallow ground-water samples in a study of 8 urban and 20 agricultural areas throughout the United States in 1993 and 1994 (Squillace and others, 1995, p. 1). The compound is added to gasoline either seasonally or year round in many parts of the United States to increase the octane level and to reduce carbon monoxide and ozone levels in the air.
The U
Authors
Jon W. Raese, Donna L. Rose, Mark W. Sandstrom
Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory-Determination of organonitrogen herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring
A method for the isolation of organonitrogen herbicides from natural
water samples using solid-phase extraction and analysis by capillary-column
gas chromatography/mass spectrometry with selected-ion monitoring is
described. Water samples are filtered to remove suspended particulate matter
and then are pumped through disposable solid-phase extraction cartridges
containing octadecyl-bonded por
Authors
Mark W. Sandstrom, Duane S. Wydoski, Michael P. Schroeder, Jana L. Zamboni, William T. Foreman
Modern biogenic gas-generated craters (sea-floor “pockmarks”) on the Bering Shelf, Alaska
As many as 1,340 small craters per square kilometre cover the sea floor of Norton Sound in the northeastern Bering Sea. The craters are circular pits, 1 to 10 m in diameter and less than 1 m deep, observed on sonographs over 20,000 km2 of northern Norton Sound sea floor. Craters typically are associated with acoustic anomalies, near-surface peaty mud, and gas-charged sediment.The peaty mud is a th
Authors
Nelson C. Hans, D.R. Thor, Mark W. Sandstrom, Keith A. Kvenvolden