科研之友
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摘要
A new silver solid-state ion-selective electrode has been prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28-bis[5-(4-methyl-6-hydroxypurimidine)thiaamyloxy] calix[4]arene, dioctyl phthalate and sodium tetraphenyl borate. The response of the electrode was linear with a good Nernstian slope of 61.4 mV decade(-1) over an Ag+ ion concentration range of 5 x 10(-8) -1 x 10(-1) mol dm(-3) and a detection limit of 1 x 10(-8) mol dm(-3). The response time to achieve a 95% steady potential for Ag+ concentrations ranging from 1 x 10(-1) to 1 x 10(-6) mol dm(-3) was between 5 and 10 s, and the electrode is suitable for use within the pH range of 3-7. The selectivity relative to several alkali, alkaline earth, transition and heavy metal ions was good. The electrode could be used for at least one month without a considerable alteration in its potential.
