Conductance of 1-1 electrolytes in methanol solutions from −45 to +23°C

Barthel, J.; Krell, M. W.; Iberl, L.; Feuerlein, F.

doi:10.1016/0022-0728(86)80118-8

Cited by 59 publications

(30 citation statements)

References 34 publications

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“…It has a moderate e r (32.63 at 257C), and, thus, a tendency for ion-pair formation can be anticipated. Indeed, in MeOH ion-pair formation is seemingly slightly more pronounced than in acetonitrile, although the latter solvent has only a slightly higher e r (36.01) [4,5]. We could follow this trend in our previous work as well [6,7].…”

Section: Introductionsupporting

confidence: 62%

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Capillary electrophoresis of anionic analytes in methanol: Effect of counter-ions on electrophoretic mobility

2002

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Mobilities of 11 substituted benzoates and 3 nitrophenolates were determined in non-aqueous methanol with Li+, Na+, K+, Rb+, and tetrabutylammonium (Bu4N+) as counter-ions of the background electrolyte. The influence of the ionic concentration of the background electrolyte on the mobility of the analyte anions is more pronounced compared to aqueous solutions. The deviation from the dependence of the mobilities on the ionic strength from the Debye-Hückel-Onsager theory indicates the occurrence of ion-pair formation. For a given ion concentration (10 mmol/L), the decrease of the analyte mobility follows the counter-ion sequence Li+ < Na+ < K+ < Rb+, which is the inverse order of their Stokes radii. Bu4N+ as counter-ion has a similar effect on the analyte mobility than Li+ (which has the same Stokes radius, but a six times smaller crystal radius). Exceptions are some di- and trihydroxybenzoates. The mobilities in methanol and in water with the same counter-ion (Na+) at a given ionic concentration show very low correlation.

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Section: Introductionsupporting

confidence: 62%

“…Obviously such effects reduce the mobility further. For associated electrolytes, theory leads to the more complex expression [3][4][5] …”

Section: Introductionmentioning

confidence: 99%

Capillary electrophoresis of anionic analytes in methanol: Effect of counter-ions on electrophoretic mobility

2002

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“…(ii) The DHO model does not take into account ionic association, which can occur especially in organic solvents of low relative permittivity. As a matter of fact, ionic association can even be present in ACN and MeOH, the solvents with moderate relative permittivity ( [36][37][38] demonstrate such association for strong electrolytes). (iii) It should be emphasized that the DHO equation (Eq.…”

Section: At 257cmentioning

confidence: 98%

The principles of migration and dispersion in capillary zone electrophoresis in nonaqueous solvents

2003

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Nonaqueous solvents are interesting media for capillary zone electrophoresis as they can affect all relevant parameters governing the separation of sample zones. However, for a rational planning of the working conditions and an appropriate interpretation of the results obtained, the basic principles of ion migration and zone dispersion must be understood. Many solvent induced effects need to be carefully considered and recognized before full exploitation of nonaqueous solvents can take place. It is the goal of this overview to present the fundamental physicochemical aspects of capillary zone electrophoresis in nonaqueous solvent systems. Therefore, the detailed discussion is related to the effect of organic solvents on electrophoretic mobilities (based on the theory of conductance), acid-base dissociation behavior (based on the transfer activity coefficient and medium effect), pH, separation efficiency (with regard to mobility and diffusion coefficient in dilute solutions), resolution, and electroosmotic flow.

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“…potassium, sodium and tetraalkylammonium salts of the acids given in Table 3), some data for simple 1:1 electrolytes indicate that ion-pair formation takes place in this solvent (see, e.g. [58,59]). This phenomenon has following two consequences:…”

Section: Methanol As Solventmentioning

confidence: 99%

Capillary zone electrophoresis in non-aqueous solutions: pH of the background electrolyte

Porras

Kenndler

2004

Journal of Chromatography A

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Conductance of 1-1 electrolytes in methanol solutions from −45 to +23°C

Cited by 59 publications

References 34 publications

Capillary electrophoresis of anionic analytes in methanol: Effect of counter-ions on electrophoretic mobility

Capillary electrophoresis of anionic analytes in methanol: Effect of counter-ions on electrophoretic mobility

The principles of migration and dispersion in capillary zone electrophoresis in nonaqueous solvents

Capillary zone electrophoresis in non-aqueous solutions: pH of the background electrolyte

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