Weighting Factor in Calculation of Comprehensive Quality Index and Optimization of PVC Membrane Composition for Ion Selective Electrode

摘要

The comprehensive quality index (CQI) method which is used in evaluatingthe response performance of an ion-selective electrode has been presented recently. Under this strategy, a set of weighting factors (f_(s), f_(LR), f_(LD), f_(t),) involving a numerical calculation of CQI is the key parameter, not only influencing the magnitude of CQI value, but also inducing a different conclusion on the optimization of composition for poly(vinyl chloride) (PVC)-based sensing membranes, which was formulated with an electroactive substance, PVC, and plasticizer. In the present work, two techniques, multivariate regression and extremum analysis of a multiple function are used to study the optimization of the weighting factor. The best set of weighting factors obtained is as follows: f_(s) velence 0.38, f_(LR) velence 0.30, f_(LD) velence 0.20, f_(t), velence 0.10.