Tannin method for the estimation of vanadium and its separation from phosphorus

A gravimetric method for the estimation of vanadium from a solution of alkalivanadote, using tannin as a precipitant, under different conditions e.g. in presence of ammonium acetate, ammonium chloride, ammonium sulphate at varied pH, under different dilution and temperature conditions has been studied. The process, so standardised, has been found to be satisfactory for the separation of vanadium from phosphate. The ease and rapidly with which the separation is accomplished makes the method superior to the cupferron method. (Mr. R.N. Misra and Mr. H. Bhattacharya, Senior Officers, National Metallurgical Laboratory, Jamshedpur)