Abstract
Three EPA-approved residual chlorine detection methods were compared using standard solutions and water collected from the Savannah River which is used to cool reactors at the Savannah River Site (SRS) near Aiken, S.C. The testing was part of an experimental program to develop baseline data for the design of a proposed cooling tower for the K-reactor at the SRS. A series of total residual chlorine (TRC) measurements made simultaneously by three methods revealed that for the river water samples, the DPD method (Hach DR-100 kit) and the amperometric titration method produced statistically similar results while an ion-selective electrode method, standardized according to the manufacturer's instructions, provided significantly lower values. The DPD method (utilizing a Hach DR-100 kit) was the recommended method for future monitoring of the water evaluated because this method is simple, provides quick results, measures both total residual chlorine (TRC) and free residual chlorine (FRC) and is equally suitable for measurements in the field and laboratory.
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