A novel technique for modifier free delivery of ligands for supercritical fluid extraction
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R. Kumar
Abstract
A novel method has been developed for the controlled delivery of various ligands including solid extractants using supercritical carbon dioxide (Sc-CO2). A ligand delivery vessel with a restricted geometry where its inlet and outlet are located beside each other, accomplished the task of the controlled delivery of ligands. The proposed method eliminates the usage of modifier solvent such as methanol for the delivery of various ligands during the supercritical fluid extraction of metal ions. Using neat Sc-CO2, the delivery profiles for the various ligands such as octyl(phenyl)-N,N-diisobutylcarbamoylmethyl-phosphineoxide (CMPO), tri-n-butyl phosphate (TBP), tri-n-octyl phosphine oxide (TOPO), theonyltrifluroacetone (TTA) and di(2-ethylhexyl)isobutyramide (D2EHIBA) were established. The delivery profiles were optimised by investigating the influence of various extraction parameters such as ligand delivery vessel geometry, temperature, pressure, flow rate of Sc-CO2 and ligand content. Applications of these ligand delivery modes were demonstrated for the supercritical fluid extraction of uranium from tissue paper matrix and preferential extraction of uranium over thorium. These results are compared with the extraction studies involving methanol or hexane modifier under similar experimental conditions. The extraction of neodymium nitrate was also demonstrated using modifier free delivery mode.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Artikel in diesem Heft
- TRLFS study on the complexation of Cm(III) with nitrate in the temperature range from 5 to 200 °C
- Rapid method for the determination of actinides in soil and sediment samples by alpha spectrometry
- Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes
- A robust biamperometric titration methodology for the determination of uranium by Ti(III) reduction in the presence of plutonium
- Preparation and characterization of Zr-IV-containing Mg-Al-Cl layered double hydroxide
- Radiation and chemical stability of calix[4]arene derivatives as prospective liquid-liquid extractants
- A comparative study of neodymium sorption by yeast cells
- A novel technique for modifier free delivery of ligands for supercritical fluid extraction
- Measurement of I-129 in environmental samples by ICP-CRI-QMS: possibilities and limitations
- Incorporation of iodine into uranophane formed during the corrosion of spent nuclear fuel
