In this work, the feasibility of employing Cyanex 923 as an extractant into the non-cerium REE (rare earth elements) impurity analysis of high-purity cerium oxide was investigated. Through investigations on the choice of the extraction medium, the optimium extraction acidity, matrix Ce4+ effect on the non-cerium REE ion extraction, the optimium extractant concentration and suitable extracting t...

We present compositions, including REEs determined by ion microprobe, of apatite and whitlockite in lunar rock assemblages rich in incompatible trace elements. Total concentrations of REE oxides in whitlockites range from 9-13 wt%, and those in apatites range from 0.15 to 1 wt%. Ratios of REE concentrations in whitlockite to those in coexisting apatite range from 10 to 60. The distribution of M...

The increasing demand for rare earth elements (REE) requires faster analysis techniques their rapid exploration. Laser-induced breakdown spectroscopy (LIBS) has on-site and real time capability. However, interference the weaker emission of minor REEs are key challenges complex REE spectra. Using simulations experimental results, we presented essential principles improved line identification in ...

The purpose of this study is to evaluate coal and byproducts (coal waste, ash, acid mine drainage) in Indiana as potential sources rare earth elements (REE). On a whole-rock basis, most samples have REE content below 100 ppm, only some the Brazil Staunton Formations (Lower Upper Block Viking B coals) reach ppm. Because concentrations vary between locations within individual beds, correlations c...

Rare earth elements (REE) are classified as critical raw materials and the environmental impact of mining them is growing concern. The recovery REE from electronic waste (e-waste) could offer a more sustainable practice. Waste printed circuit boards (WPCBs) an important resource in e-waste stream due to their content valuable materials. However, data regarding concentration distribution WPCBs v...

Loveringite-davidite members of the crichtonite group were synthesized at high pressure and temperature (7.5 kbar, 1000-1050 ~ from a melt of TiO2 and rare earth element (REE) enriched basaltic andesite composition. Four sets of partition coefficients for La, Sin, Ho, Lu and Sr (analogue for Eu 2+) were obtained. These show that light and heavy REE are readily accommodated, but the intermediate...

BACKGROUND During feeding trials, it is useful to predict daily energy expenditure (DEE) to estimate energy requirements and to assess subject compliance. OBJECTIVE We examined predictors of DEE during a feeding trial conducted in a clinical research center. DESIGN During a 28-d period, all food consumed by 26 healthy, nonobese, young adults was provided by the investigators. Energy intake ...

BACKGROUND Basal energy requirements are higher in adolescents with sickle cell anemia (SCA) than in healthy control subjects. However, no equation is available to accurately predict their energy needs. OBJECTIVE Our objective was to develop a clinically useful equation to estimate resting energy expenditure (REE) in adolescents with SCA. DESIGN REE and other components of total energy expe...

In the present study, the feasibility to use phosphate solubilizing bacteria (PSB) to develop a biological leaching process of rare earth elements (REE) from monazite-bearing ore was determined. To predict the REE leaching capacity of bacteria, the phosphate solubilizing abilities of 10 species of PSB were determined by halo zone formation on Reyes minimal agar media supplemented with bromo cre...