US 5,347,844 AGranted

Process and device for vaporization injections in equipments for gas chromatographic analysis

AssigneeFisons Instruments S.p.A.

InventorsKonrad Grob, Fausto Munari

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Abstract

The invention concerns a process and a device for splitless vaporizing injection of samples into equipments of gas chromatographic analysis. The technique is applied specially when liquid samples generate volumes of vapors which cannot be housed inside the vaporizing chamber. Inside the vaporisation chamber, kept at high temperature, evaporation of the sample solvent forms a cool zone where the solutes are retained while the solvent vapors expand out of the vaporizing chamber and leave the injector. The sample liquid is kept in place within the vaporization chamber by suitable obstacles or by a packing material. At the end of solvent evaporation, i.e. when cooling ceases, the injection zone returns to the regulated injector temperature and the compounds to be analysed are transferred to the column by the carrier gas.

Claims20

Dependent claims

A process for the injection of liquid samples into a gas chromatograph comprising the steps of:

maintaining an injector of said gas chromatograph, said injector including a vaporisation chamber, at a set temperature at least exceeding the boiling point, at operating pressure, of a solvent to be injected and which is sufficiently high to allow for the transfer of a component to be analyzed into a column of said gas chromatograph;
opening an exhaust duct from said vaporisation chamber;
interrupting a flow of a carrier gas through said vaporisation chamber and into said column;
temporarily creating, inside said vaporisation chamber, a cool zone having a temperature substantially equal to said boiling point of said solvent while maintaining said injector at said set temperature;
injecting said component to be analyzed into said vaporisation chamber such that at least a part of said component to be analyzed is disposed within said cool zone as a liquid;
eliminating said cool zone while maintaining said injector at said set temperature;
closing said exhaust duct and restoring said flow of carrier gas to said column;
vaporising said component to be analysed;
and
transporting said vaporised component to be analyzed to said column by means of said flow of carrier gas.

7 more elements

Dependencies are inferred from the claim text.