Abstract: The invention relates to a method and device for preparing samples for gas chromatography, the sample material being guided through a liquid chromatograph (1) by a solvent and being monitored by a detector (2), and, on the basis of the detector (2) recognizing a chromatographic region of interest, the sample material of this region being removed from the stream of sample material leaving the liquid chromatograph (1) and being analyzed by gas chromatography. In this case, the stream of sample material leaving the liquid chromatograph (1) is guided through a flow-through cuvette (4), and the removal is carried out, until the end of the chromatographic region of interest, via a syringe (18) which, when the sample material of the region of interest reaches the flow-through cuvette (4), is introduced into the stream of sample material guided through the flow-through cuvette (4) and is drawn upwards at a predetermined ratio to the transport rate of the stream of sample material.

Abstract: The invention relates to a method and device for preparing samples for gas chromatography, the sample material being guided through a liquid chromatograph (1) by means of a solvent and being monitoring by means of a detector (2), and, on the basis of the detector (2) recognizing a chromatographic region of interest, the sample material of this region being removed from the stream of sample material leaving the liquid chromatograph (1) and being analyzed by gas chromatography. In this case, the stream of sample material leaving the liquid chromatograph (1) is guided through a flow-through cuvette (4), and the removal is carried out, until the end of the chromatographic region of interest, via a syringe (18) which, when the sample material of the region of interest reaches the flow-through cuvette (4), is introduced into the stream of sample material guided through the flow-through cuvette (4) and is drawn upwards at a predetermined ratio to the transport rate of the stream of sample material.

Abstract: The invention relates to a method for applying samples to be analyzed by gas chromatography using a sampling tube, which has a section which contains the adsorbing agent and narrows essentially conically towards a bore which is free of adsorbing agent and has a reduced diameter, in such a manner that the flow rate of a gas which is guided through towards the narrowed section on the outlet side is at least approximately equal to the inlet-side flow rate, liquid or gaseous starting sample material being guided through the sampling tube towards the narrowed section, so that substances to be analyzed are adsorbed on the adsorbing agent, the sampling tube being flushed with drying gas, which is guided through the sampling tube in the same direction as the starting sample material, until the liquid phase, which is contained in the sampling tube, or the starting sample material is essentially removed, and the adsorbed sample being desorbed by means of a carrier gas which is introduced through the sampling tube from

Abstract: The invention relates to a method for applying samples to be analyzed by gas chromatography using a sampling tube, which has a section which contains the adsorbing agent and narrows essentially conically towards a bore which is free of adsorbing agent and has a reduced diameter, in such a manner that the flow rate of a gas which is guided through towards the narrowed section on the outlet side is at least approximately equal to the inlet-side flow rate, liquid or gaseous starting sample material being guided through the sampling tube towards the narrowed section, so that substances to be analyzed are adsorbed on the adsorbing agent, the sampling tube being flushed with drying gas, which is guided through the sampling tube in the same direction as the starting sample material, until the liquid phase, which is contained in the sampling tube, or the starting sample material is essentially removed, and the adsorbed sample being desorbed by means of a carrier gas which is introduced through the sampling tube from

Abstract: The invention relates to a gas chromatography transfer line, having a glass tube (12), a steel tube (13) enclosing this glass tube and a heating coil (17) enclosing the steel tube, in which a tube (15) made of a material with high thermal conductivity is arranged between the steel tube (13) and the heating coil (17), the tube (15) being provided with a series of bores (16) in the axial and in the circumferential direction and being soldered to the heating coil (17) and to the steel tube (13), the solder (20) filling the bores (16) and intermediate spaces between the steel tube (13) and the tube (15).

Abstract: The invention relates to a thermal desorption device for a gas chromatograph, having a thermostatically controlled oven (1) provided with a carrier gas connection and having an evaporator tube. In this case, the evaporator tube is an interchangeable sample holder tube (5) which can be held by a holding chamber (2) in the oven (1), which sample holder tube can be fitted into a holder piece (6) with one end externally sealed by a seal (8), the holder piece (6) having two seals (9) arranged separated in the region of its casing and being capable of being fitted into a correspondingly designed holder (10), the carrier gas connection (14) opening in the region (12) of an annular gap (13) between the holder (10) and the holder piece (6) between the two seals (9) located on the casing, which annular gap (13) is, for its part, connected to an annular gap (15) surrounding the inserted end of the sample holder tube (5), a trap (18) being connected downstream.

Abstract: A gas chromatograph having a carrier gas feed for a pressure-controlled feeding of a carrier gas stream, which feed leads to a sample applicator having preliminary separation which is connected to a branch piece and the latter to a separation column. The branch piece additionally has a feed line for a regulated auxiliary gas stream, an outlet leading to a switchable valve arrangement, an outlet leading to a monitoring detector, and throughbore with a restrictor therein. A detector is optionally connected to the separation column.

Abstract: A sample injection or extraction head for gaseous or liquid fluids, especially for use in gas chromatography. An inner bore of the head is in alignment with a passage of an introduction opening for receiving a syringe needle. The introduction opening is connected with the inner bore via a seal so that a syringe needle which has been inserted through the introduction opening into the inner bore is sealed against the exterior via the seal. An inlet valve is provided having a valve body which is sealingly spring biased against the inner bore and is displaceable by the introduction of a syringe needle for opening the valve against the spring bias, such displacement taking place at an angle between the axis of the inner bore and the axis of the valve within the range of more than 90.degree. up to less than 180.degree.. A cylindrical guide for the valve body ends in a recess of the head. The recess extends across the inner bore and provides an annular sealing surface.