Abstract
Abstract A nonaqueous titration method for the determination of dodine in 65% wettable powder formulations was studied by ten collaborators. The dodine is extracted from the formulation with acetic acid-acetic anhydride (10 + 90). The extract is filtered, and the resultant acetylated compound in solution is basic enough to be titratable with perchloric acid at a relatively low potential. The titration is carried out potentiometrically or visually, using metanil yellow as an indicator. The coefficients of variation for re-dodecylguanidine acetate standard and the 65% wettable powder formulation were 0.24 and 0.55%, respectively. The method is recommended for adoption as official first action.
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