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A study has been made on the P erkin-Elmer model 52A flame photometer to establish its suitability for t he determination of Na20 and K 20 in portland cements and cement raw materials, such as argillaceous limestones and clays. An essential factor in the successful application of the method is t he use of suitable standard solutions for each type of material analyzed. Such so lutions were developed and excellent resul ts obtained. This paper gives the photometric resul ts due to numerous variables and presents a recommended procedure. On cements, t he averages of t he differences between the direct-intensity photometric and the grav imetric values obtained were 0.012 percent for Na20 and 0.024 percent for K ,O. Slight ly closer agreement was obtained with the internal-standard method, but un certa in t ies due to the possible presence of Li20 give greater re liabi li ty to t he direct-intensity method. The advantages of flam e photometry , both in time and accuracy, are such as to warrant its recommendation for t he purpose examined.

Studies on the flame photometer for the determination of Na2O and K2O in portland cement