Argon is isolated from air by fractionation, most commonly by cryogenic fractional distillation, a process that also produces purified nitrogen, oxygen, neon, krypton and xenon.
Severinghaus, J. P., Grachev, A. & Battle, M. Thermal fractionation of air in polar firn by seasonal temperature gradients.
This article demonstrates the efficacy of a foam harvester that combines dispersed air flotation with foam fractionation to allow harvesting, concentration, and physical separation of particles in suspension.
The fractionation line is close to a mixing line between SW and air.
The root bark of A. excelsa was botanically verified by Professor Shrihari Mishra (one of the authors in the present manuscript) and the extraction and fractionation of air-dried powdered root bark was done using chloroform.
The total alkali-extractable hydroxycinnamate content of the AIRs and insoluble residues after fractionation was determined by saponification of 5 mg of sample in 4 mol/L sodium hydroxide as described in [ 17].
In an experiment of complete pyrite oxidation by Fe3+, an untreated S0 impurity of 1.8 × 10-3 mol g-1 FeS2, originating from oxidation by the O2 in air, would result in an apparent fractionation between the pyrite and the product sulfate of ~0.64‰ instead of ~0.7‰.
Generally, soil CO2 efflux was 2 3 ‰ depleted when compared with soil air CO2, pointing to kinetic isotope fractionation during soil CO2 efflux (Figs. 3, 4).
To determine if changes to the global hemicellulose content had occurred in the transgenic lines a standard chemical fractionation protocol was employed on AIR, followed by gravimetric analysis.
Five fractions were prepared by fractionation.
20 fractions were obtained after fractionation.
