Chemistry

Ion Balancing Act

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Science  10 Aug 2001:
Vol. 293, Issue 5532, pp. 1017
DOI: 10.1126/science.293.5532.1017c

Ion-selective electrodes allow for the quick determination of concentration, but at low concentrations, solvent polymeric ion-selective electrodes deviate from linear or Nernstian behavior. Some of these effects can be minimized if an ion buffer is included to prevent primary ion leaching from the internal solution, but minor ion fluxes can still produce nonlinearities. Pergel et al. show that the addition of a galvanostatic current control can be used to balance these fluxes and to improve the detection limit for a lead ion-selective electrode to 3 × 10−12 molar while maintaining a Nernstian response. — PDS

Anal. Chem. 10.1021/ac010094a.

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