(Physical Testing and Chemical Analysis, No 5, (1985) 266)
J. Fan and H. Liu
Department of Chemistry, Central South University of Technology, Changsha, P. R. China
The determination of molybdenum in tungsten and tungsten trioxide by atomic absorption spectrophotometry was investigated. The interference from other elements and the matrix and the effects of some organic compounds (surfactants, etc ) as well as alkaline and alkaline-earth metal salts on the determination were examined. Matrix matching technique and addition of some alkaline-earth metal were used to solve the problem caused by the matrix. All the major experiment conditions, such as fuel flow rate and ratio of fuel flow rate to air flow rate, PH of the solution, height of the burner, drive current of the lamp, were studied. The procedure was optimized with respect to sensitivity and selectivity.