Partition between immiscible

There are few data on this point. Most information comes from the experimental work of Watson (1976) on trace partitioning between immiscible liquids in the K20-Al203-Fe0-Si02 system at 1180 °C and 1 bar. Table 10.6 shows some concentration limits based on this experimental work. At present, it is impossible to establish whether or not deviations from Henry s law take place in the acidic or basic liquids at equilibrium. 

O ince partitioning between immiscible solvents is an equilibrium process, it should be possible to calculate partition coefficients for any solute between any two given solvents if we had a measure of the solvation forces involved. At present these forces are not that well characterized, and the reverse approach can be more enlightening—i.e., a study of how the partition coefficient varies between the systems can yield valuable insight into the types and relative magnitude of the forces involved. 

These usually are decomposed by light, air and solvents, so that degradation products are probable impurities. Chromatography and adsorption spectra permit the ready detection of coloured impurities, and separations are possible using solvent distribution, chromatography or crystallisation. Thus, in partition between immiscible... 

A variant of the above problem is the presence of immiscible liquids such as oil, dissolved hydrophilic organics, or hydrophobic organic matter on mineral surfaces. As discussed by MacGowan and Surdam in this volume, aluminum and other inorganic species important to our understanding of mineral systems, partition between immiscible liquids such as oil and water. 

Liquid chromatography (LC) a. Liquid-liquid, or partition Liquid adsorbed or bonded to a solid surface Partition between immiscible liquids... 

There has been much speculation in the past on the nature of the circulating thyroid hormone whether it was a simple amino acid, a peptide or polypeptide of thyroxine, or thyroglobulin itself. In 1948 Taurog and Chaikoff produced a considerable amount of evidence that the plasma hormone was indeed thyroxine. Labeled plasma iodine behaved chemically in a manner identical with that of thyroxine added to plasma it was nondialyzable it was precipitated with plasma proteins with zinc hydroxide it was extractable with butanol, and it could be fractionated with carrier thyroxine by its partition between immiscible solvents. This work received confirmation from Laidlaw (1949), and it then became generally accepted that thyroxine alone was the circulating hormone. 

We already know that organic compounds tend to partition between immiscible solvents so that the ratio of concentrations in the two solvents is constant (the pcirtition coefScient). We also know that organic acids and bases tend to associate with or dissociate from hydrogen ions according to pH, as described by the Henderson-Hasselbalch (H-H) equation. We can therefore picture a situation in which the two solvents may each contain both ionised and un-ionised material (Fig. 8.6). 

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