Method and apparatus for preconcentrating a gaseous sample
First Claim
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1. A system for concentrating an analyte gas in a gas stream of an analytical system, the system comprisingat least one separation device, for separating components of an analyte gas;
- at least one gas inlet line, for delivering the analyte gas from a supply of analyte gas to the separation device;
at least one detector, for detecting components of the analyte gas;
at least one gas outlet line, for delivering the components from the separation device to the detector;
a first split line in fluid communication with the gas inlet line at a first junction, and a first split valve for controlling gas flow in the first split line;
wherein opening of the first split line releases a part of a gas flow through the first split line and thereby reduces a flow rate through the separation device.
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Abstract
A system for concentrating an analyte gas in a gas stream of an analytical system is provided. The system comprises at least one separation device, at least one gas inlet line, at least one detector, at least one gas outlet line, a first split line in connected to the gas inlet line, and a first split valve for controlling gas flow in the first split line. Also provided is a method for concentrating an analyte gas.
3 Citations
32 Claims
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1. A system for concentrating an analyte gas in a gas stream of an analytical system, the system comprising
at least one separation device, for separating components of an analyte gas; -
at least one gas inlet line, for delivering the analyte gas from a supply of analyte gas to the separation device; at least one detector, for detecting components of the analyte gas; at least one gas outlet line, for delivering the components from the separation device to the detector; a first split line in fluid communication with the gas inlet line at a first junction, and a first split valve for controlling gas flow in the first split line; wherein opening of the first split line releases a part of a gas flow through the first split line and thereby reduces a flow rate through the separation device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of concentrating a sample gas for detection in a continuous flow retention-based analytical device having a gas inlet and a gas outlet, the method comprising steps of:
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providing a flow of gas into the analytical device at a first flow rate, wherein the gas contains an analyte gas comprising at least one component that is retained in the device and a carrier gas that is not retained; reducing the flow rate of the carrier gas into the analytical device to a second flow rate prior to at least one selected component of the analyte gas emerging at the gas outlet of the analytical device, by splitting away a part of the gas stream through a first split line on, or in fluid communication with, an inlet gas line that is connected to the gas inlet, wherein the second flow rate is lower than the first flow rate; whereby the at least one selected component of the analyte gas is concentrated in the carrier gas as it travels through the retention-based analytical device at the second flow rate. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification