Coefficient of selectivity

Table 11. Diffusion Coefficients and Solubility Coefficients of Selected Penetrants in Polymers at 25°C ...

The main chemico-analytical properties of the designed ionoselective electrodes have been determined. The work pH range of the electrodes is 1 to 5. The steepness of the electrode function is close to the idealized one calculated for two-charged ions (26-29 mV/pC). The electrode function have been established in the concentration range from 0.1 to 0.00001 mole/1. The principal advantage of such electrodes is the fact that thiocyanate ions are simultaneously both complexing ligands and the ionic power. The sensitivity (the discovery limits), selectivity (coefficient of selectivity) and the influence of the main temporal factors (drift of a potential, time of the response, lifetime of the membranes) were determined for these electrodes. 

Paschke, A., Manz, M., Schtiurmann, G. Application of different RP-HPLC methods for the determination of the octanol/water partition coefficient of selected tetrachlorobenzyltoluenes. Chemosphere 2001, 45, 721-728. 

The last item has been taken into account by Fujiwara et al. [1980] who introduced a total selectivity similar to Kaiser s selectivity (Eq. 7.21) but products Sj -c instead of the partial sensitivities. However, this definition range is (—1... + oo). A more acceptable range of selectivity results from Doerffel s coefficient of selectivity CSA (Doerffel et al. [1986]) ... 

Table 4 Monomeric Friction Coefficients of Selected Polymers...

Every segment in the polymer chain is solvated by two solvent molecules. Those molecules of solvents 1 and 3 in the solvated sheath which correspond to the bulk composition of 1 1 are disregarded. Only those molecules of solvent 1 in the solvated sheath in excess of this 1 1 ratio constitute what may be regarded as the complex with the polymer. In this particular example the value of is 1 mol of solvent-1 per mol of segment. If the molar volumes of liquid-1 and polymer segment were equal, the coefficient of selective adsorption could also be expressed here as 1 ml of liquid-1 per ml of monomer units. 

H. VKehiaian. Virial Coefficients of Selected Gases. nCRC Handbook of Chemistry and Physics, D. R. Lide, Ed. CRC Press Boca Raton, 2005 pp. 6.23-6.42. 

Li, A. and Doucette, W.J. The effect of cosolutes on the aqueous solubilities and octanol/water partition coefficients of selected polychlorinated biphenyl congeners. Environ. Toxicol. Chem., 12(ll) 2031-2035, 1993. 

Paschke, A., Neitzel, P.E., Walther, W., and Schiirmann, G. Octanol/water partition coefficient of selected herbicides determination using shake-flask method and reversed-phase high-performance liquid chromatography, J. Chem. Eng. Data, 49(6) 1639-1642, 2004. 

Przyjazny, A., Janicki, W., Chrzanowski, and Staszewki, R. Headspace gas chromatographic determination of distribution coefficients of selected organosulphur compounds and their dependence of some parameters, J. Chromatogr. A, 280 249-260, 1983. 

Rohrschneider, L. Solvent characterization by gas-liquid coefficients of selected solutes. Anal Chem., 45 (7) 1241-1247,1973. Romero Taboada, E., Barifouse M.M., Rasero, F.S., Pena, H.A., de laColina, G.C., and Dios. C.G. Fate of methabenzthiauron in calcareous soils from southeastern Spain, J. Environ. Qua ., 26(2) 466-471,1997. 

Fig. 15 Interannual variability of runoff regimes from 1993 to 2006, based on classified Parde coefficients of selected catchment areas at varying mean altitudes [56]...

L. Rohrschneider, Solvent characterization by gas-liquid partition coefficients of selected solutes. Analytical Chemistry, 45 (1973) 1241. 

Most of the authors (2, 3, 7, 19, 21) who use labelled molecules are concerned with the process of ion exchange by adsorbed ionized soap molecules and calculate the separating factors or the coefficient of selectivity for the exchanging cations (2, 3,19) or anions (7, 21). 

From the equilibrium values we calculated the coefficient of selectivity (9) and the corresponding free energy and determind their variation as a function of the separation between the ionized sites. 

The coefficient of selectivity (9) a corresponding to the following reaction of exchange... 

Stoichiometric coefficients of selected antioxidants in reactions with... 

Fiedler, H., Schramm, K.-W. (1990) QSAR generated octanol-water partition coefficients of selected mixed halogenated dibenzo-dioxins and dibenzofurans. Chemosphere 20, 1597-1602. 

Activity Coefficients of Selected Major Species in Sea Water... 

Rohrschneider, L. (1973) Solvent characterization of gas-Uquid partition coefficients of selected solutes. AwaZ. Chem. 45(7), 1241-1247. Roslev, P, Madsen P.L., Thyme, J.B., Henriksen, K. (1998) Degradation of phthalate and di-(2-ethylhexyl)phthalate by indigenous and inoculated microorganisms in sludge-amended soil. Appl. Environ. Microbiol. 64, 4711 719. 

Rohrschneider L. Solvent Characterization by Gas-liquid Partition Coefficients of Selected Solutes. Anal Chem 1973 45 1241-1247. 

TABLE 48—8. Predicted and Measured Sieving Coefficients of Selected Drugs... 

Haddad et al. measured retention volumes for a variety of bases on a quaternary ammonium functionalized PS-DVB stationary phase using dilute aqueous sodium hydroxide as the eluent [11]. Values for the retention volumes and distribution coefficients of selected bases are given in Table 8.3. Strong bases, which are fully ionized a the eluent pH, elute at the column void volume and have a value of 1.0. Solutes intermediate between these two extremes are partly ionized and generally can be separated by an ion-exclusion mechanism. 

Figures. Relative sensitivities of ozone towards the rate coefficients of selected elementary reactions of the chemical mechanism used at t = 30 min. The results for all diesel exhaust experiments are shown in comparison with those for the reference experiment with base mixture I. DCB = unsaturated dicarbonyls. For the calculation of the total fraction for the other reactions, the signs of the single sensitivities were not considered.

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