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Results were expressed as mg g −1 astaxanthin in extract or raffinate. Chemical characterization of H. pluvialis extracts and SAF fractions by comprehensive two-dimensional liquid chromatography. ... On the other hand, considering the lack of previous reports including the use of a C30 column in LC×LC setups, ...
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Waste assessment chemical characterization of the Weldon Spring site Raffinate Pitts Technical Report As part of the remedial investigation efforts conducted at the Weldon Spring Site Remedial Action project (WSSRAP), it was recognized that an assessment of the nature and extent of the types of waste in the Weldon Spring …
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The Formerly Utilized Sites Remedial Action Program (FUSRAP) is an environmental remediation program. It addresses radiological contamination generated by activities of the Manhattan Engineer District and the Atomic Energy Commission (MED/AEC) during development of the atomic weapons in the 1940s and 1950s.
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Synthesis and characterization of GA-PVDF composite. The starting material, graphene oxide(GO), was prepared by oxidation of graphite flakes through the modified Hummer's method [18, 19]. Three-dimensional graphene-based composite, denoted as GA-PVDF, was prepared following our previous report . First, GO and PVDF solution was …
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U.S. Department of Energy Office of Scientific and Technical Information. Search terms: Advanced search options. ...
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Therefore, a purification step should be considered for the initial raffinate treatment to solve the co-precipitation problem before preparing NZVI. During the purification step, the pH of the initial raffinate was increased from 1.8 to 5. Consequently, the aluminum ions were eliminated from the initial raffinate due to the pH increase.
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Two medium-low temperature coal tars (MLCTs) derived from the pyrolysis of low-grade bituminous coal were separated into 11 narrow fractions by true boiling distillation. The primary property and chemical composition analysis of MLCTs and their distillate narrow fractions were investigated at the macroscopic and molecular level by gas …
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the raffinate ponds area, the proposed strategy is no further remediation in conjunction with the application of supplemental standards (on the basis of limited use ground water) and, as a best management practice, continued ground water and surface water monitoring.
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raffinate crystal samples were analyzed for radium-226, radium-228, thorium-230, throium-232, and lead-210. Radium-226 activities ranged from 59 to 600 ρCi/L in the raffinate samples from the five ores. A composite raffinate sample had an activity level of 234 ρCi/L. The raffinate crystals contained 7.9 ρCi/g of radium-226.
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A preliminary geologic site characterization study was conducted at the Weldon Spring Raffinate Pits Site, which is part of the Weldon Spring Site, in St. Charles County, …
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At a pH of 7.00 the extraction efficiency is just 3% . The extraction efficiency in Example 7.7.3 is greater at more acidic pH levels because HA is the solute's predominate form in the aqueous phase. At a more basic pH, where A – is the solute's predominate form, the extraction efficiency is smaller.
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4 Results and Discussion A chromatogram of reformate gasoline is shown in Figure 1. Reformate is a high concentration, aro-matic hydrocarbon gasoline feedstock from the
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To facilitate the structural characterization of the precipitated solids derived from the neutralized raffinate, a set of reference compounds were synthesized and analyzed. The reference compounds include crystalline scorodite, poorly-crystalline scorodite, iron(III)–arsenate co-precipitates obtained under different pH conditions, and ...
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Supercritical CO2 extraction (SCCO2) extraction of cannabis oil from Indian cannabis (Cannabis indica) leaves was optimized through a central composite design using CO2 pressure (150–250 bar), temperature (30–50 °C) and time (1–2 h). From the regression model, the optimal CO2 pressure, extraction temperature and time were 250 bar, 43 °C …
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data for raffinate at uranium/vanadium mills but was unable to find data from other mills that correlated well with the proposed operations at the Piñon Ridge Mill. As a result, bench …
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The objective of this study was to develop a process for the synthesis of magnetite nanocomposites from raffinate of hydrometallurgical plants containing iron ions. Towards this goal, a three-step process was developed. After the reduction of Fe(III) to Fe(II) in the first stage, Al3+ in the raffinate was precipitated as Al(OH)3 and finally magnetite …
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In order to evaluate the feasibility of using GA-PVDF composite material in spent fuel reprocessing for removing the entrained organic phase in raffinate, the phase …
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Energy Fuels Resources Corporation (Energy Fuels) submitted this construction application to the U.S. Environmental Protection Agency (EPA) in compliance with 40 CFR Part 61, Subpart W for constructing and operating the first of three uranium/vanadium tailings disposal cells (Tailings Cell A), each encompassing …
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The most efficient strategy tested was a solvent extraction cycle with AliCy followed by alkalinization of its aqueous raffinate to pH 3.25 or 3.5. ... Table 1 Characterization of copper-free AMD obtained from an extreme AMD collected at the São Domingos mine after three cycles of SX with 30% (v/v) Acorga M5640 in Shell GTL + …
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To aid the structural characterization, synthetic iron(III)-arsenate co-precipitates were prepared to mimic the actual uranium mill tailings neutralization products. The principle components analysis method was used to validate the synthetic amorphous scorodite as a primary model compound for arsenate species in the raffinate samples under the
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2.1. Supercritical CO 2 Extraction of Cannabis Oil. SCCO 2 extraction of cannabis oil from Cannabis indica leaves was conducted through the central composite design (CCD) design of experiments by assessing three experimental factors such as CO 2 pressure, temperature and extraction time with cannabis oil yield as the response. The cannabis oil was …
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GBH Enterprises, Ltd. Process Engineering Guide: GBHE-PEG-MAS-613 Liquid-Liquid Extraction: Basic Principles Information contained in this publication or as otherwise supplied to Users is believed to be accurate and correct at time of going to press, and is given in good faith, but it is for the User to satisfy itself of the suitability of the information …
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Economical value of raffinate for synthesis of magnetic Fe 3 O 4 nanoparticles.. Under optimized conditions Al 3+ and Fe 2+ of raffinate are precipitated 87% and 13%.. H 2 O 2 as oxidizing agent is more effective than purging oxygen during nano-synthesis.. The nano-magnetite particles were nearly spherical with approximately …
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U.S. Department of Energy Office of Scientific and Technical Information. Search terms: Advanced search options. ...
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The comparison of the raffinate fractions in Figure 8 and Figure 9 highlights the use of APCI to effectively ionize the saturated compounds. In Figure 9, for HC and S 1, the aromatic compounds present in raffinate 2 are found in BSS, and paraffin is found in wax. As in the HPLC3 and GPC-ICP HR MS results, raffinate 2 and BSS are similar.
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The optimization and characterization of the recycling utilization of raffinate in the copper leaching process. January 2020. DOI: 10.1016/j.jmrt.2019.12.052. License. CC BY-NC-ND. Authors:...
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Technical Report: Aquifer Characteristics Data Report for the Weldon Spring Site chemical plant/raffinate pits and vicinity properties for the Weldon Spring Site Remedial Action Project, ... Aquifer characterization activities were performed to develop a hydrogeologic understanding of a site west of St. Louis, Missouri, which became ...
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X-ray absorption fine structure (XAFS) is used to characterize the mineralogy of the iron(III)–arsenate(V) precipitates produced during the raffinate (aqueous effluent) neutralization process at the McClean Lake uranium mill in northern Saskatchewan, Canada. To facilitate the structural characterization of the precipitated solids derived …
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Technical Report Sloat, R; Shank, E The Eurochemic organization was modified to include special contact groups for the various architect-engineers. The current plant design capacity is 350 kg/day of natural uranium in aluminum or magnesium cladding and 200 kg/day of slightly enriched uranium (5% max.) in stainless steel and Zircaloy cladding.
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Characterization of pentavalent and hexavalent americium complexes in nitric acid using X-ray absorption fine structure spectroscopy and first-principles modeling. Journal of Radioanalytical and Nuclear Chemistry 2016, 309 (3), 1087-1095.
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