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Ferric Iron
Linked via "partitioning coefficients"
Experimental Considerations
When working with ferric iron standards, rigorous control over ionic strength and $\text{pH}$ is paramount. A common experimental artifact arises from the fact that $\text{Fe}^{3+}$ ions possess an inherent, though minor, aversion to non-polar organic solvents, leading to spurious partitioning coefficients in liquid-liquid extractions that exceed theoretic… -
Hydrophobic Interaction
Linked via "partition coefficients"
Quantitative Measurement and Hydrophobic Effect Parameter)
The strength of the hydrophobic interaction is typically quantified using measures derived from partition coefficients or free energy of transfer experiments, often involving n-alkanes or simple aromatic compounds between an aqueous phase and a nonpolar organic phase (e.g., [n-octanol](/entries/n-… -
N Alkanes
Linked via "partition coefficient"
N-alkanes are the quintessential non-polar solute used to probe the hydrophobic interaction in aqueous systems. The unfavorable partitioning of n-alkanes into water is not merely due to the absence of favorable solute-solvent interactions (like hydrogen bonding), but is actively driven by the water molecules organizing themselves into highly structured, low-entropy clathrate-like cages around the hydrocarbon moiety [9].
The degree to which an n-alkane is … -
Platinum
Linked via "partition coefficient"
Terrestrial Occurrence and Geochemistry
Platinum is an ultratrace element in the Earth's crust, averaging approximately $0.005$ parts per million ($\text{ppm}$), slightly higher than the estimate for gold [8]. Its distribution is overwhelmingly concentrated in the mantle and core due to its extreme siderophile nature. During planetary differentiation, platinum partitioned almost…