Tessek Sdruzeni Praha

Zdenek Formanek

Vaclav Krivanek

Alena Stuchikova

Anna Vlasakova

Petr Puschel

Antonin Pokorny

A method and device for mineralization of carbonaceous materials, for determining trace concentration of chemical elements in foods, fodder, plant, and animal tissues and other materials. The method can also be used for determining the structure of the mineral skeleton of carbonaceous materials or for preparing ash of carbonaceous materials for various technological uses. The method includes heating a specimen to a temperature ranging from 300.degree. to 400.degree. C. for 6 to 20 hours at atmospheric pressure in a stream of oxygen, at a rate of 0.03 to 0.15 ml.s.sup.-1.g.sup.-1 of the specimen. A gas with a higher oxydative strength than that of oxygen is added to the stream of oxygen, said gas being selected from the group consisting of ozone, nitrogen oxides, chlorine and mixtures thereof such as an ozone-nitrogen oxides mixture, chloroxides of nitrogen, in an amount of 1 to 6 volume percent. The device for performing the improved method consists of a mineralization unit comprising a heatable block, provided with flatbottomed cylindrical holes for inserting the mineralization flasks containing the specimens. The block is covered by a lid, provided with openings for the necks of the flasks. Said mineralization flasks being cylindrically conically tapered towards the cylindrical neck. Inlet capillaries are loosely inserted into said openings and are at their top parts connected with the distributor of the gas mixture stream.

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Zdenek Formanek