Method and device for preparing substances for qualitative and quantitative analyses
A method and a device for preparing a qualitative and quantitative analysis of samples are presented. The device affords the possibility of delimiting and isolating a specific region of a solid or liquid sample. A liquid, e.g. a solvent or extracting agent, is added in the delimited and isolated region. Thereafter the created mixture of substance and liquid is, in a plug-shaped fashion, pressed out of the closed region by means of a neutral liquid or the same liquid, and supplied to the measuring instrument in the form of a highly concentrated solution.
1. A method for preparing a qualitative and quantitative analysis of a substance, comprising:
isolating a sample including the substance embedded in a matrix, the matrix consists of insolubly solid or soluble components, in a completely closed-off and sealed cavity by clamping a plate containing the sample between sealing edges of a head and a counter head, said plate arranged between said head and counter head;
bringing said sample into contact with a liquid supplied by a supply line, wherein said liquid at least partially flows through said sample; and
supplying at least a portion of the substance, as a specimen, to a measuring instrument via a discharge line.
2. The method as claimed in claim 1 , wherein, prior to flowing over and at least partially flowing through, said introduced liquid remains in said cavity together with the sample for 1-60 seconds, wherein said liquid acts on said sample during this time, after which said specimen is supplied to the measuring instrument via discharge line.
3. The method as claimed in claim 1 , wherein an internal standard is added to the specimen in said cavity, wherein said specimen and said internal standard are together supplied to the measuring instrument via discharge line.
4. A device for carrying out a method for preparing a qualitative and quantitative analysis of substances, the device comprising:
a head having a sealing edge;
a counter head;
a cavity formed between the head and the counter head, the cavity provided with a supply line and a discharge line;
a plate containing a substance for analysis, arranged between the head and the counter head, wherein the cavity is surrounded by a separation line formed by the sealing edge of the head and a surface of the plate so that in a closed state the cavity is sealed and isolated from an external atmosphere.
5. The device as claimed in claim 4 , wherein said counter head is a planar surface.
6. The device as claimed in claim 4 , wherein said supply line and discharge line are arranged on the outer contour of said cavity and are located across from one another on opposite sides of the cavity, the supply line located at one “end” of the cavity and the discharge line arranged at the other “end” of the cavity.
7. The device as claimed in claim 4 , wherein said cavity is embodied such that it has a cross section A between said supply line and discharge line.
8. The device as claimed in claim 4 , wherein said plate is made of glass, wherein the material of the said sample is clamped between said sealing edge and plate.
9. The device as claimed in claim 4 , wherein said plate is a ductile plate, which is slightly penetrated by said sealing edge.
10. The device as claimed in claim 4 , wherein said sealing edge is provided with an O-ring.