Computer calculation of liquid-junction potentials—I. Concentration profiles at junctions with concentrated KCl

✍ Scribed by John Bagg

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 455 KB
• Volume: 35
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(90)87011-p

✦ Synopsis

A numerical method has been used to simulate the junction Z (0.001-6 M) (( KCI (4 M), where Z is (a) HCI or an alkali halide with an ion in common with KC1 or (b) CaCI,, LaCI,, or K,SO,. By applying diffusion equations to this simulation the ionic concentration profiles have been determined. The diffusion equations &d in the calculations of concentration profiles were those arising from irreversible thermodynamics and contain activity coefficients and cross-diflusional terms. The results of the simulation indicate that the concentration profiles at these junctions are better approximated by the limiting case where each component diffuses independently rather than by the continuous-mixture assumption.