Toxic Substances Hydrology Program

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GeoHEALTH-USGS Newsletter

GeoHEALTH-USGS Newsletter

The GeoHEALTH–USGS Newsletter—published since 2004—provides information on USGS science activities pertinent to safeguarding the health of fish, wildlife, domesticated animals, and people from environmental exposures to contaminants and pathogens.

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Featured Science Activities

Featured Science Activities

Lean about our Featured Science Activities through our pages that highlight science studies, publications, and results.

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Filter Total Items: 3,639
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Year Published: 1997

Logistic model of nitrate in streams of the upper-midwestern United States

Nitrate in surface water can have adverse effects on aquatic life and, in drinking-water supplies, can be a risk to human health. As part of a regional study, nitrates as N (NO3-N) was analyzed in water samples collected from streams throughout 10 Midwestern states during synoptic surveys in 1989, 1990, and 1994. Data from the period immediately...

Mueller, D.K.; Ruddy, B.C.; Battaglin, W.A.
Logistic model of nitrate in streams of the upper-midwestern United States; 1997; Article; Journal; Journal of Environmental Quality; Mueller, D. K.; Ruddy, B. C.; Battaglin, W. A.

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Year Published: 1997

Marine bacterial degradation of brominated methanes

Brominated methanes are ozone-depleting compounds whose natural sources include marine algae such as kelp. Brominated methane degradation by bacteria was investigated to address whether bacterial processes might effect net emission of these compounds to the atmosphere. Bacteria in seawater collected from California kelp beds degraded CH2Br2 but...

Goodwin, K.D.; Lidstrom, M.E.; Oremland, R.S.
Marine bacterial degradation of brominated methanes; 1997; Article; Journal; Environmental Science and Technology; Goodwin, K. D.; Lidstrom, M. E.; Oremland, R. S.

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Year Published: 1997

Method for determination of methyl tert-butyl ether and its degradation products in water

An analytical method is described that can detect the major alkyl ether compounds that are used as gasoline oxygenates (methyl tert-butyl ether, MTBE; ethyl tert-butyl ether, ETBE; and tert-amyl methyl ether, TAME) and their most characteristic degradation products (tert-butyl alcohol, TBA; tert-butyl formate, TBF; and tert-amyl alcohol, TAA) in...

Church, C.D.; Isabelle, L.M.; Pankow, J.F.; Rose, D.L.; Tratnyek, P.G.
Method for determination of methyl tert-butyl ether and its degradation products in water; 1997; Article; Journal; Environmental Science and Technology; Church, C. D.; Isabelle, L. M.; Pankow, J. F.; Rose, D. L.; Tratnyek, P. G.

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Year Published: 1997

Microbial reduction of iodate

The different oxidation species of iodine have markedly different sorption properties. Hence, changes in iodine redox states can greatly affect the mobility of iodine in the environment. Although a major microbial role has been suggested in the past to account for these redox changes, little has been done to elucidate the responsible...

Councell, T.B.; Landa, E.R.; Lovley, D.R.
Microbial reduction of iodate; 1997; Article; Journal; Water, Air, and Soil Pollution; Councell, T. B.; Landa, E. R.; Lovley, D. R.

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Year Published: 1997

Microorganisms as tracers in groundwater injection and recovery experiments: A review

Modern day injection and recovery techniques designed to examine the transport behavior of microorganisms in groundwater have evolved from experiments conducted in the late 1800s, in which bacteria that form red or yellow pigments were used to trace flow paths through karst and fractured- rock aquifers. A number of subsequent groundwater hydrology...

Harvey, R.W.
Microorganisms as tracers in groundwater injection and recovery experiments: A review; 1997; Conference Paper; FEMS Microbiology Reviews; Harvey, R. W.

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Year Published: 1997

Mixed-mode sorption of hydroxylated atrazine degradation products to sell: A mechanism for bound residue

This study tested the hypothesis that sorption of hydroxylated atrazine degradation products (HADPs: hydroxyatrazine, HA; deethylhydroxyatrazine, DEHA; and deisopropylhydroxyatrazine, DIHA) to soils occurs by mixed-mode binding resulting from two simultaneous mechanisms: (1) cation exchange and (2) hydrophobic interaction. The objective was to use...

Lerch, R.N.; Thurman, E.M.; Kruger, E.L.
Mixed-mode sorption of hydroxylated atrazine degradation products to sell: A mechanism for bound residue; 1997; Article; Journal; Environmental Science and Technology; Lerch, R. N.; Thurman, E. M.; Kruger, E. L.

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Year Published: 1997

Modeling structural influences on soil water retention

A new model quantities the effect of soil structure, considered as the arrangement of particles in the soil, on soil water retention. The model partitions the pore space into texture-related and structure-related components, the textural component being what can be deduced to exist if the arrangement of the particles were random, and the...

Nimmo, J.R.
Modeling structural influences on soil water retention; 1997; Article; Journal; Soil Science Society of America Journal; Nimmo, J. R.

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Year Published: 1997

Multiphase flow modeling of a crude-oil spill site with a bimodal permeability distribution

Fluid saturation, particle-size distribution, and porosity measurements were obtained from 269 core samples collected from six boreholes along a 90-m transect at a subregion of a crude-oil spill site, the north pool, near Bemidji, Minnesota. The oil saturation data, collected 11 years after the spill, showed an irregularly shaped oil body that...

Dillard, Leslie A.; Essaid, Hedeff I.; Herkelrath, William N.
Multiphase flow modeling of a crude-oil spill site with a bimodal permeability distribution; 1997; Article; Journal; Water Resources Research; Dillard, L. A.; Essaid, H. I.; Herkelrath, W. N.

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Year Published: 1997

Nuclear magnetic resonance identification of new sulfonic acid metabolites of chloroacetanilide herbicides

The detection of the sulfonic acid metabolites of the chloroacetanilide herbicides acetochlor, alachlor, butachlor, propachlor, and, more recently, metolachlor in surface and ground water suggests that a common mechanism for dechlorination exists via the glutathione conjugation pathway. The identification of these herbicides and their metabolites...

Morton, M.D.; Walters, F.H.; Aga, D.S.; Thurman, E.M.; Larive, C.K.

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Year Published: 1997

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 (...

Kolpin, D.W.; Kalkhoff, S.J.; Goolsby, D.A.; Sneck-Fahrer, D. A.; Thurman, E.M.
Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995; 1997; Article; Journal; Ground Water; Kolpin, D. W.; Kalkhoff, S. J.; Goolsby, D. A.; Sneck-Fahrer, D. A.; Thurman, E. M.

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Year Published: 1997

Organic carbon and nitrogen content associated with colloids and suspended particulates from the Mississippi River and some of its tributaries

Suspended material samples were collected at 16 sites along the Mississippi River and some of its tributaries during July-August 1991, October-November 1991, and April-May 1992, and separated into colloid and particulate fractions to determine the organic carbon content of these two fractions of suspended material. Sample collection involved...

Rostad, C.E.; Leenheer, J.A.; Daniel, S.R.
Organic carbon and nitrogen content associated with colloids and suspended particulates from the Mississippi River and some of its tributaries; 1997; Article; Journal; Environmental Science and Technology; Rostad, C. E.; Leenheer, J. A.; Daniel, S. R.

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Year Published: 1997

Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: Results of in-situ and laboratory tests

Buoyant densities were determined for groundwater bacteria and microflagellates (protozoa) from a sandy aquifer (Cape Cod, MA) using two methods:  (1) density-gradient centrifugation (DGC) and (2) Stoke's law approximations using sedimentation rates observed during natural-gradient injection and recovery tests. The dwarf (average cell size, 0.3 μm...

Harvey, R.W.; Metge, D.W.; Kinner, N.; Mayberry, N.
Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: Results of in-situ and laboratory tests; 1997; Article; Journal; Environmental Science and Technology; Harvey, R. W.; Metge, D. W.; Kinner, N.; Mayberry, N.