An indirect chelatometric procedure for the determination of devised.An amount of 0.05 M lead acetate is added to the slightly acidic tungstate solution (neutral to phenol red and then 4 gm of ammonium acetate is added).The precipitate is filtered and washed with 2 per cent ammonium acetate is added). The precipitate is filtered and washed with 2 per cent ammonium acetate solution (slightly acidified with acetic acid) until free from lead. Dissolve the precipitate with a solution containing 4 per cent sodium hydroxide and 10 per cent tartaric acid, adjust the solution to pH 4 and add pH 10 buffer solution and Eriochrom T.Back titrate with zinc chloride standard solution after adding a known amount of 0.02 MEDTA standard solution.The method can be applied to samples containing 12 to 150 mg of tungsten trioxide.The analyses of a wolframite and of an ore containing.tungsten and a high percentage of tin with the method proposed are given as examples.