Sensitive arsenic analysis by carrier-mediated counter-transport single drop microextraction coupled with capillary electrophoresis

Inorganic Arsenic Determination in Food: A Review of Analytical Proposals and Quality Assessment Over the Last Six Years

“…212 Very few contributions have been found that deal with arsenic speciation in general over the last five years. 213,214 We now summarize those reports with application to arsenic speciation in food samples; some of them include iAs results, although with no specific determination of iAs species.…”

The synergistic extraction of uranium ions from monazite leach solution via HFSLM and its mass transfer

“…The driving force of the process is the hydrogen ion concentration gradient in the feed phase and stripping phase. The concentration gradient of hydrogen ions yielded the high enrichment factors for metal ions [34]. Acidic organo-phosphorous and neutral donors act as the accelerator for the transport of specific components from the feed phase to the Nomenclatures aq the species in the aqueous phase k af mass transfer coefficient in the feed solution (cm/s) k as mass transfer coefficient for the stripping solution (cm/s) k e mass transfer coefficient due to the extraction reaction (cm/s) k m mass transfer coefficient of the membrane phase (cm/s) k o mass transfer coefficient in the shell side between hollow fibers (cm/s) k s mass transfer coefficient due to the stripping reaction (cm/s) K overall mass transfer coefficient (cm/s) L fiber module length (cm) org the species in the organic liquid membrane phase R overall mass transfer resistance (s/cm) S.C. the synergistic coefficient stripping phase.…”

“…The uranium complex species diffuse to the interface between the liquid membrane phase and the stripping phase by the concentration gradient. Hydrogen ions from the stripping phase diffuse to the liquid membrane-stripping interface and react with the uranium complex species [34]. Consequently, uranium ions are released into the stripping phase.…”

Optimization of synergistic extraction of neodymium ions from monazite leach solution treatment via HFSLM using response surface methodology

“…The driving force of the process is the proton concentration gradient in the feed solution and the stripping solution. The gradient of proton concentration yielded high enrichment factors for metal ions (Cheng et al, 2013). Neodymium ions in the feed solution are transported to the interface between the feed phase and the liquid membrane phase.…”