Abstract: Microanalytical method for the simultaneous determination of the elements, carbon, hydrogen, sulfur, chlorine, bromine, iodine and nitrogen in a single, small sample of an organic material, said method comprising the steps of: (a) substantially instantaneously igniting and rapidly and completely combusting a small sample of limited size in a heated combustion zone in a pressurized atmosphere of substantially pure oxygen; (b) conducting the gaseous mixture of combustion products in excess oxygen through a heated equilibrium zone; (c) conducting the effluent from the equilibrium zone through a gas chromatographic separation zone containing an adsorbent material adapted to separate combustion products of the said elements each from the others; (d) conducting the effluent from the separation zone through detecting means to quantitatively and separately measure the amount of the combustion product of each of the elements; (e) calculating from the amounts of the several combustion products the percentage content of