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A method was described for determination of trace levels of silicon by inductively coupled plasma mass spectrometry (ICP-MS) from hydrofluoric (HF) digests of biological samples. The volatility of silicon in HF digests was examined with synthetic solutions as well as soil and mine waste samples. A digestion scheme was optimized to achieve complete dissolution, avoid loss of volatile silicon species and produce sample solutions that can be directly analyzed by ICP-MS. The performance of the method performance was validated by analysis of a number plant and tissue certified reference materials for silicon by ICP-MS. The method was then applied to the determination of silicon from lung biopsy tissues obtained from...
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Waters co-produced during petroleum extraction are the largest waste stream from oil and gas development. Reuse or disposal of these waters is difficult due both to their high salinities, which can greatly exceed 35 g/L (seawater equivalent), and also the sheer volume of wastewater generated, which is estimated at nearly 900 billion gallons per year across the United States. Beyond disposal concerns, produced water may also represent a possible source of valuable mineral commodities. While an understanding of the trace element composition of produced water is required for evaluating the associated resource and waste potential of these materials, measuring trace elements in high salinity brines is challenging due...
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Samples of the crater lake water were filtered in the field with a 0.45 micron filter. Subsequently, additional precipitates formed in the solute-rich samples (secondary precipitates). The solids that accumulated on the filters (both secondary and original precipitate) were digested by heating overnight in a sealed Teflon vial with 300 µL concentrated HCl, 100 µL concentrated HNO3, and 500 µL concentrated HF. Following digestion, samples were dried down, then re-dissolved in 300 µL concentrated HNO3 and diluted with MilliQ water. The liquid from the digested samples were analyzed for element concentrations by inductively coupled plasma-optical emission spectrometry (ICP-OES) using a ThermoFisher ICAP 6500 Duo at...
Researchers at the U.S. Geological Survey (USGS) and their collaborators conducted a study of the geochemical properties of coals currently produced for electric power generation in the Illinois Basin in Illinois and Indiana. The study follows from recommendations by an expert panel for the USGS to investigate the distribution and controls of trace constituents such as mercury (Hg) in Illinois Basin coals and the behavior of these constituents in coal preparation. A total of 72 new samples were collected by USGS collaborators. These samples include raw coals, prepared coals, and waste coals from coal preparation. To understand the geochemistry and cleaning behavior of these coals, these samples were subjected to...


    map background search result map search result map Direct Trace Element Determination in Oil and Gas Produced Waters with Inductively Coupled Plasma – Optical Emission Spectrometry (ICP-OES): Advantages of High Salinity Tolerance (2019) Geochemical Data for Illinois Basin Coal Samples, 2015–2018 (ver. 1.1, March 2021) Oil samples and geochemical analyses of Afghanistan and adjacent areas (oilafg.shp) f) Chemical composition of solids filtered from the water lake in Halema’uma’u Crater, Kīlauea Volcano, Hawaii f) Chemical composition of solids filtered from the water lake in Halema’uma’u Crater, Kīlauea Volcano, Hawaii Geochemical Data for Illinois Basin Coal Samples, 2015–2018 (ver. 1.1, March 2021) Oil samples and geochemical analyses of Afghanistan and adjacent areas (oilafg.shp) Direct Trace Element Determination in Oil and Gas Produced Waters with Inductively Coupled Plasma – Optical Emission Spectrometry (ICP-OES): Advantages of High Salinity Tolerance (2019)