Determination of low levels of sodium in water by using a sodium-ion responsive glass electrode

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Abstract
An E.I.L. sodium-ion responsive glass electrode has been tested under laboratory conditions.The electrode responded linearly to sodium-ion concentrations over the range 0·25 to 25 p.p.m. of sodium, and the slope of the potential-concentration curve approximated to the theoretical value calculated from the Nernst equation. By correcting for the level of sodium estimated to be present in the pure water used to prepare the standards, a linear relationship could be obtained covering the range down to the level of sodium in the pure water. High precision could then be achieved for measurements made over the 0·004 to 25 p.p.m. range of sodium.At low sodium levels the electrode is capable of detecting extremely small changes in sodium concentration. The possible errors involved in measuring sodium levels below 0·025 p.p.m. would tend to give results biased slightly high with respect to the true concentration. For plant control purposes this is generally preferable to readings biased low.A sodium monitor would be capable of responding quickly to the changes in sodium concentration likely to be encountered in the water-steam circuit of a power plant.

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