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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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January 1, 1992

Analytical applications of inductively coupled plasma-mass spectrometry

No abstract available.

Authors

H. E. Taylor, John R. Garbarino

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1992

Transport of pathogens through soils and aquifers

No abstract available.

Authors

G. Bitton, R.W. Harvey

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1992

Determination of subsurface fluid contents at a crude-oil spill site

Measurement of the fluid-content distribution at sites contaminated by immiscible fluids, including crude oil, is needed to better understand the movement of these fluids in the subsurface and to provide data to calibrate and verify numerical models and geophysical methods. A laboratory method was used to quantify the fluid contents of 146 core sections retrieved from boreholes aligned along a 120

Authors

K.M. Hess, W.N. Herkelrath, H.I. Essaid

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1992

Sources of nitrogen and phosphorus to Northern San Francisco Bay

We studied nutrient sources to the Sacramento River and Suisun Bay (northern San Francisco Bay) and the influence which these sources have on the distributions of dissolved inorganic nitrogen (DIN) and dissolved reactive phosphorus (DRP) in the river and bay. We found that agricultural return flow drains and a municipal wastewater treatment plant were the largest sources of nutrients to the river

Authors

S.W. Hager, L. E. Schemel

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, San Francisco Bay and Sacramento-San Joaquin Delta Estuary

January 1, 1992

Ammonia fixation by humic substances: A nitrogen-15 and carbon-13 NMR study

The process of ammonia fixation has been studied in three well characterized and structurally diverse fulvic and humic acid samples. The Suwannee River fulvic acid, and the IHSS peat and leonardite humic acids, were reacted with 15N-labelled ammonium hydroxide, and analyzed by liquid phase 15N NMR spectrometry. Elemental analyses and liquid phase 13C NMR spectra also were recorded on the samples b

Authors

K. A. Thorn, M.A. Mikita

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1992

Hydrous pyrolysis of crude oil in gold-plated reactors

Crude oils from Iraq and California have been pyrolyzed under hydrous conditions at 200 and 300°C for time periods up to 210 days, in gold-plated reactors. Elemental (vanadium, nickel), stable isotopic (carbon), and molecular (n-alkanes, acyclic isoprenoids, steranes, terpanes and aromatic steroid hydrocarbons) analyses were made on the original and pyrolyzed oils. Various conventional crude oil m

Authors

J.A. Curiale, P.D. Lundegard, Y.K. Kharaka

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1992

Reduction of uranium by Desulfovibrio desulfuricans

The possibility that sulfate-reducing microorganisms contribute to U(VI) reduction in sedimentary environments was investigated. U(VI) was reduced to U(IV) when washed cells of sulfate-grown Desulfovibrio desulfuricans were suspended in a bicarbonate buffer with lactate or H2 as the electron donor. There was no U(VI) reduction in the absence of an electron donor or when the cells were killed by he

Authors

D. R. Lovley, E. J. P. Phillips

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1992