Analyses of subsurface Permian rock samples from the Central Oklahoma Aquifer
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Open-File Report↗
Geology topics
E. P. Welsch
Publications and source records attributed to E. P. Welsch.
Analytical results and sample locality map of rock samples from the Lime Canyon Wilderness Study Area (NV-050-231), Clark County, Nevada
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Open-File Report↗
Analyses and descriptions of geochemical samples from the Big Branch and Peru Peak Wildernesses and the Wilder Mountain Roadless Area, Rutland and Bennington Counties, Vermon
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Open-File Report↗
Analysis of soil samples from the Fernley area; Churchill, Lyon, and Washoe counties, Nevada
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Open-File Report↗
Analyses and descriptions of geochemical samples from the Southern Nantahala Roadless Area and vicinity in Rabun County, Georgia, and Clay and Macon counties, North Carolina
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Open-File Report↗
Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Spring Basin Wilderness Study Area (OR-005-009), Wheeler County, Oregon
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Open-File Report↗
Analytical results and sample locality map of stream-sediment and heavy-mineral-concentrate, and rock samples from the Mount Tipton Wilderness Study Area (AZ-020-012/042), Mohave County, Arizona
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Open-File Report↗
Analytical results and sample locality map of nonmagnetic and moderately magnetic heavy-mineral concentrates from stream sediments from the Glens Falls 1° x 2° quadrangle, New York, Vermont, and New Hampshire
No abstract available.
New Hampshire, New York, Vermont↗
Geochemical data for rock samples from the Owens Peak and Little Lake Canyon Wilderness Study Areas, Inyo and Kern counties, California
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Open-File Report↗
A rapid geochemical spectrophotometric determination of tungsten with dithiol
1-g sample is decomposed with nitric and hydrofluoric acids, and after evaporation of the solution to dryness the residue is dissolved in concentrated hydrochloric acid. A clear aliquot is treated with stannous chloride to inhibit interferences. The blue tungsten dithiol complex is developed at a temperature of 85° over a half-hour period. The complex is extracted into 2 ml of heptane and the tungsten is determined spectrophotometrically with a sensitivity of 0.5 ppm. Fifty samples per man-day can be analysed in this manner.
Talanta↗
Geochemical analyses of minus-200 mesh stream sediments of the Anaconda-Pintlar Wilderness, Beaverhead, Deer Lodge, Granite, and Ravalli counties, Montana
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Open-File Report↗
Analytical results for 78 ground-water samples from the Casa Grande vicinity, Arizona
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Open-File Report↗