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Unformatted text preview: standards to a high, constant ionic strength. If the activity coefficients are all constant, the electrode potential gives concentrations directly. 1. Concentrations measure the number of moles per liter of solution, while activities account for the effect of ionic strength. 2. Benefits of using ISE: they do not consume unknowns; the introduce negligible contamination; fast response times; color and turbidity do not hinder their effectiveness; they can be used inside living cells. Disadvantages of using ISE: precision is rarely better than 1%, and is usually worse; they can be fouled by proteins or other organic solutes, which can lead to a sluggish, drifting response; certain ions interfere with or poison particular electrodes; some are fragile and have a limited shelf-life....
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- Spring '08