Large volume gas chromatography injection port
A method and system for sample analysis involve a temporally-resolving separation of sample components. In the method, solvent vapors are condensed prior to entering a temporally-resolving separator, a GC column, for example, and solvent-depleted vapors are directed to the separator where constituents are resolved in time. A system for analyzing a sample comprises an injection port, a temporally-resolving separator (e.g., a GC column) and a conduit connecting the two. The injection port is at a temperature sufficiently high to vaporize the solvent and analytes present in a sample. The conduit is configured and/or operated to condense the solvent, while maintaining the analytes in the vapor phase.
1. A sample analysis method, comprising:
vaporizing water and analytes present in a sample, wherein the water is present in the sample in an amount of at least 99 volume percent;
condensing the water upstream of a temporally-resolving separator to produce a water-depleted vapor component; and
passing the water-depleted vapor component through the temporally-resolving separator, thereby resolving in time analytes present in the water-depleted vapor component.
2. The sample analysis method according to claim 1 , further comprising analyzing the time-resolved analytes by optical spectrometry.
3. The sample analysis method according to claim 1 , further comprising analyzing the time-resolved analytes by mass spectrometry.
4. The sample analysis method of claim 1 , further comprising evacuating the condensed water vapors.
5. The sample analysis method of claim 1 , wherein the sample is provided by direct injection and without sample splitting.
6. The sample analysis method of claim 1 , wherein the water vapor is condensed in a transfer line upstream of the temporally-resolving separator.
7. The sample analysis method of claim 1 , wherein the temporally-resolving separator is a GC column.
8. The sample analysis method according to claim 1 , further comprising analyzing the time-resolved analytes by Fourier transform infrared spectrometry.
9. The sample analysis method of claim 1 , further comprising a controller controlling a temperature of an injection port for the vaporizing of the water and controlling a temperature of a transfer line for the condensing of the water.
10. A sample analysis method, comprising:
vaporizing a sample containing water and analytes from a thermal desorption tube or a cryo-trap;
condensing water vapors upstream of a temporally-resolving separator to produce a water-depleted vapor component; and
passing the water-depleted vapor component through the temporally-resolving separator, thereby resolving in time analytes present in the water-depleted vapor component.
11. The sample analysis method of claim 10 , wherein the method does not employ a secondary thermal desorption tube.
12. The sample analysis method of claim 10 , further comprising a mass spectrometry or an optical spectrometry analyzer.
13. The sample analysis method of claim 10 , further comprising a controller controlling a temperature of an injection port for the vaporizing of the water and controlling a temperature of a transfer line for the condensing of the water.
14. A sample analysis system, comprising:
an injection port;
a temporally-resolving separator; and
a conduit connecting the injection port and the temporally-resolving separator,
wherein,
the injection port is at a temperature sufficiently high to vaporize water and analytes present in a sample; and
the conduit is configured to condense the water and maintain the analytes in the vapor phase producing a water-depleted vapor component.
15. The sample analysis system of claim 14 , wherein the temporally-resolving separator is a GC column.
16. The sample analysis system of claim 14 , further comprising an arrangement for cooling the conduit and detecting a temperature of the conduit and heating the injection port and/or detecting a temperature of the injection port.
17. The sample analysis system of claim 14 , further comprising an arrangement for removing the condensed water from an interior of the conduit.
18. The sample analysis system of claim 14 , wherein the conduit includes one or more changes in cross section.
19. The sample analysis system of claim 14 , further comprising a mass spectrometry analyzer.
20. The sample analysis system of claim 14 , further comprising an optical spectrometry analyzer.
21. The sample analysis system of claim 14 , further comprising a controller.
22. The sample analysis system of claim 14 , further comprising a controller for controlling a temperature of the injection port by driving an injection port heater and monitoring an injection port temperature detector, the controller also controlling a transfer line heating and cooling system and using a transfer line temperature detector to detect a temperature of the transfer line.
23. A sample analysis system, comprising:
a thermal desorption tube or a cryo-trap;
a conduit for passing vapors from the thermal desorption tube or the cryo-trap to a temporally-resolving separator,
wherein,
the conduit is configured to condense water and maintain the analytes in the vapor phase producing a water-depleted vapor component.
24. The sample analysis system of claim 23 , wherein the system does not employ a secondary thermal desorption tube.
25. The sample analysis system of claim 23 , further comprising a mass spectrometry or an optical spectrometry analyzer.
26. The sample analysis system of claim 23 , further comprising a controller for controlling a temperature of the injection port by driving an injection port heater and monitoring an injection port temperature detector, the controller also controlling a transfer line heating and cooling system and using a transfer line temperature detector to detect a temperature of the transfer line.