| 摘要 |
The invention relates to a method and a device for the mineralization of carbonaceous materials, e.g. for subsequent dissolution and chemical analysis for determination of chemical elements in trace concentrations in foods, fodder, plant and animal tissues and other materials. The specimen is heated to a temperature ranging from 300 to 400 DEG C for 6 to 20 h at atmospheric pressure in a stream of oxygen at a rate of 0,03 to 0,15 ml/s per gram of the specimen, to which a gas having a higher oxydative strength than that of oxygen is added, said gas being selected from ozone, nitrogen oxides, chlorine and mixtures thereof, such as ozone-nitrogen oxides mixtures or chloroxides of nitrogen, in an amount of 1 to 6 % by volume. The device consists of a mineralization unit 12 formed by a heatable block 13 provided with cylindrical holes having a flat bottom for inserting the mineralization flasks 15 with the specimens, the block being covered by a lid 14 provided with openings for the necks of the mineralization flasks 15, which have cylindrical, shape conically tapering towards the cylindrical neck, inlet capillaries 16 being loosely inserted into the openings of the mineralization flasks 15 and being at their top parts connected with a distributor 10 for the mineralization gas mixture. The method can be also used for determining the structure of the mineral skeleton of carbonaceous materials or for careful producing ash of carbonaceous materials for technological purposes. |
