4-Chloro-2, 5-Dimethoxyacetoacetanilide as a Gravimetric Reagent for Beryllium (II) and Copper (II)

National Chemical Laboratory, Poona-8. Manuscript received 1 June 1974 ; accepted 30 September 1974. 4-Chloro-2, 5-dimethoxyacetoacetanilide, has been found to precipitate Be(II) and Cu(II) ions from solutions, quantitatively in the pH range 5.8-6.5 and at slightly higher pHs. The precipitated complexes, having the compositions, Be(C12H13O4,NCl)2 and Cu(C12H13O4,NCl)2, are stable and can be weighed directly after drying at 115°-20°. A method for the estimation of these metal ions, using 4-chloro-2, 5-dimethoxyacetoacetanilide as a precipitant has been described. Beryllium (II) in presence of aluminium (III) and iron (III) and copper (II) in presence of aluminium (III), radium (II) and zinc (II) can he precipitated from solutions by masking the foreign ions with disodium salt of EDTA or ammonium fluoride. T. G. A. and D. T. A. data for the beryllium and copper complexes are also presented