Premium
Steady‐State Model Calculations Predicting the Influence of Key Parameters on the Lower Detection Limit and Ruggedness of Solvent Polymeric Membrane Ion‐Selective Electrodes
Author(s) -
Zwickl Titus,
Sokalski Thomasz,
Pretsch Ernö
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199907)11:10/11<673::aid-elan673>3.0.co;2-w
Subject(s) - ionophore , lipophilicity , potentiometric titration , membrane , analyte , detection limit , ion , diffusion , chemistry , electrode , steady state (chemistry) , analytical chemistry (journal) , ion selective electrode , ionic bonding , diffusion layer , solvent , selectivity , chromatography , thermodynamics , organic chemistry , biochemistry , physics , catalysis
Using a previously described steady‐state model, the influence of various parameters on the response function of ion‐selective electrodes is investigated. The parameters studied include activities of interfering ions of the sample and inner solution, selectivity coefficients, lipophilicity of the analyte, concentrations of ionophore and lipophilic ionic sites in the membrane, the thickness of the Nernstian diffusion layer and the membrane as well as the diffusion coefficients in both phases. The results obtained provide indications as to how the lower detection limit of potentiometric sensors and their ruggedness can be improved.