Date of Award
Master of Science (MS)
Harold S. Choguill
A simultaneous determination of chloride and phosphate ions was attempted using a platinum microelectrode. It was found that chlorides and phosphates can be amperometrically titrated in an acid medium and borate buffer solution respectively. A fifty per cent ethanol -water solvent was sufficient to decrease the solubility of AgCI and AglD4 in dilute solution. Relative percentage error of less than 2% were obtained in solutions down to 10-4 tl in chloride and phosphate ions. Even in the presence of 0.2% gelatin, the Ag3P04 precipitate depolarized the electrode somewhat, especially in the dilute solutions of 10-3 M to 10-4 M. For the detection of the end point, the recommended procedure for the extrapolation to the zero current had to be modified. Instead, the base line had to be drawn through the points immediately preceding the equivalence point. This method of extrapolation was used and found to be reproducible, giving well defined end points.
Copyright 1965 Hisamitsu Nakadomari
Nakadomari, Hisamitsu, "A Simultaneous Amperometric Determination of Chlorides and Phosphates" (1965). Master's Theses. 932.