Partial molar volumes of naphthalene and fluorene at infinite dilution in carbon dioxide near its critical point

Abstract

R I1(RSN=O) intermediates, and the subsequent trapping of the NO radical:Paramagnetic species can also be produced from reaction of NO with ferrous iron containing ligands. Results from the ICP optical emission spectroscopy indicated that the thiols in question are almost void of iron impurity ( < 2 ppm). It, was reported3 that thionitrites, in the presence of secondary amines, produce N-nitrosamines. A detailed knowledge of the mechanism of the reaction of nitroso compounds with thiols is pertinent, since it may involve the formation as well as the inhibition of the carcinogenic N-nitrosamines.

Determination of thermodynamic properties by supercritical fluid chromatography

“…Under the conditions mentioned in the introduction to section 2, the isothermal change of the solute retention factor with pressure in a (1 + 2 + 3) system (without a cosolvent) is given by [21,22,[56][57][58][59][60]:…”

“…(6) and (7) were used extensively to determine the partial molar volumes of diverse solutes at infinite-dilution in scCO 2 . The selection of solutes included aromatic hydrocarbons [21,22,[56][57][58][68][69][70][71][72][73], C 6 -C 16 n-alkanes and alkylated cyclohexanes [68], benzoic acid and 2-methoxynaphthalene [69,71], C 3 -C 9 aliphatic and C 10 terpenic alcohols [74], coenzyme Q 10 [75], polyunsaturated long-chain carboxylic acids [76,77] and their ethyl esters [78], C 21 -C 40 n-alkanes [79], and β-carotene and vitamin E [80]. The effect of the correction for uptake of scCO 2 by the stationary phase could only be tested in naphthalene [73] where sufficient amount of independentv ∞ 1m data were available [81].…”

Use of isopycnic plots to understand the role of density in SFC – I. Effect of pressure variation on retention factors

“…Some of the most important work on this topic had been reported in the early literature of SFC [13][14][15][16]. Assuming thermodynamic equilibrium between the two phases of a solute at infinite dilution, van Wasen and Schneider [13] derived the following dependencies of retention factor on pressure (ref Eq.…”

Measurement of Solubilities in Fluids at Supercritical Temperatures and Lower Pressures Using Chromatographic Retention

“…The method is in principle applicable to measurements at all pressures, but is here applied to the lower pressure range where conventional methods are more difficult. It is related to the method used to obtain partial molar volumes for naphthalene and fluorene in supercritical CO 2 from chromatographic retention data [2]. 178 I.K.…”