SUFFET containing inorganic base may also yield pyruvic acid as a hydrolytic byproduct. Furthermore, the storage of concentrated aqueous solutions of sodium dalapon prior to application will necessitate more material than generally required to obtain a desired result. The preparation of concentrated stock solutions will result in at least an initial 3 to 5% loss of material by hydrolysis and more upon storage. Therefore, stock solutions at high concentration which are diluted prior to application should not be prepared and stored for long periods (Melnikov, 1971).It appears that sodium dalapon solutions with concentrations greater than about 0.9 m form basic solutions when freshly prepared (Figure 1). Upon standing, however, these solutions become acidic from the hydrochloric acid released by the decomposition of the dalapon salt. Therefore, the pH value of 6.0 reported for a 50% solution must be the observed pH for sodium dalapon and its hydrolytic byproducts rather than sodium dalapon alone. Although the quantity of material lost through hydrolysis to reduce the hydroxide ion concentration to an acidic pH is only 3 to 490, this loss may become significant for certain material balance studies.The pH values have been reported here for sodium dalapon solutions with respect to different concentrations. These values should not be considered as the true pH of the solution due to hydrolysis prior to measurement. The results may be used, however, as a general guideline to indicate the approximate pH expected for a solution of given concentration.