A gas chromatograph includes a sample gas generator, a separation column configured to separate components of an introduced sample gas, a gas supply source configured to supply a carrier gas to the sample gas generator to carry the sample gas from the sample gas generator to the separation column when the components of the sample gas are analyzed, a controller configured or programmed to acquire an in-analysis usage amount of the carrier gas based on an analysis time for analyzing the components of the sample gas, and a flow rate of the carrier gas supplied from the gas supply source to the sample gas generator, and a display configured to display the in-analysis usage amount acquired by the controller.

An apparatus detects a target gas in ambient air. The apparatus has a GC column, a sensor downstream of the GC column, a pump, a gas storage chamber and a pneumatic circuit. The pneumatic circuit has two states. In a first state, the pump draws in ambient air and supplies it to the gas storage chamber to store ambient air under pressure within the chamber, while trapping a sample of ambient air within the pneumatic circuit. In the second state, the gas storage chamber is connected to the GC column to cause pressurised air drawn from the storage chamber to act as a carrier gas to advance the trapped sample through the GC column and sensor. A filter is filters out any target gas present in the air entering into, or the air drawn from, the storage chamber, to avoid the presence of any target gas in the carrier gas.

An apparatus detects a target gas in ambient air. The apparatus has a GC column, a sensor downstream of the GC column, a pump, a gas storage chamber and a pneumatic circuit. The pneumatic circuit has two states. In a first state, the pump draws in ambient air and supplies it to the gas storage chamber to store ambient air under pressure within the chamber, while trapping a sample of ambient air within the pneumatic circuit. In the second state, the gas storage chamber is connected to the GC column to cause pressurised air drawn from the storage chamber to act as a carrier gas to advance the trapped sample through the GC column and sensor. A filter is filters out any target gas present in the air entering into, or the air drawn from, the storage chamber, to avoid the presence of any target gas in the carrier gas.

A method for identifying a reagent during a process in an analysis system is disclosed. The analysis system comprises a liquid chromatograph and a mass spectrometer. The method comprises providing a reagent, adding at least one chemical substance to the reagent with a concentration being above a detection level of the mass spectrometer, processing the reagent together with the chemical substance with the analysis system, and identifying the reagent based on a detection of a substance detection signal of the mass spectrometer representing the chemical substance.

A method for tracking a sample identity during a process in an analysis system is disclosed. The analysis system comprises a liquid chromatograph and a mass spectrometer. The method comprises providing a sample, adding a composition of different chemical substances to the sample with a concentration being above a detection level of the mass spectrometer, processing the sample together with the composition with the analysis system, detecting and measuring a component and/or components of the sample with the mass spectrometer, detecting and measuring the composition or parts of the composition of different chemical substances with the mass spectrometer, and identifying the sample based on a detection of a substance detection signal pattern of the mass spectrometer including substance detection signals representing the composition of chemical substances.

A method for identifying a reagent during a process in an analysis system is disclosed. The analysis system comprises a liquid chromatograph and a mass spectrometer. The method comprises providing a reagent, adding at least one chemical substance to the reagent with a concentration being below a detection level of the mass spectrometer, enriching the chemical substance within the liquid chromatograph to a concentration above the detection level of the mass spectrometer, processing the reagent together with the enriched chemical substance by means of the analysis system, and identifying the reagent based on a detection of a substance detection signal of the mass spectrometer representing the chemical substance.

A gas transport system includes at least one chemical reactor having at least one inlet and at least one gas outlet and at least one sample introduction unit for delivering the sample into the chemical reactor. The gas transport system at least one carrier gas line fluidly coupled to the chemical reactor inlet for introducing into the chemical reactor carrier gas from a carrier gas source, at least one gas outlet line from the chemical reactor gas outlet, and at least one gas recycling line connected to the gas outlet and/or the gas outlet line by a first gas line junction that is arranged between the chemical reactor and a downstream detection unit on the gas outlet line. The gas transport system is adapted to allow recycling of at least a portion of gas emerging from the chemical reactor outlet back to the chemical reactor via the gas recycling line.

Certain embodiments described herein are directed to chromatography systems that include a microfluidic device. The microfluidic device can be fluidically coupled to a switching valve to provide for selective control of fluid flow in the chromatography system. In some examples, the microfluidic device may include a charging chamber, a bypass restrictor or other features that can provide for added control of the fluid flow in the system. Methods of using the devices and methods of calculating lengths and diameters to provide a desired flow rate are also described.

Certain embodiments described herein are directed to chromatography systems that include a microfluidic device. The microfluidic device can be fluidically coupled to a switching valve to provide for selective control of fluid flow in the chromatography system. In some examples, the microfluidic device may include a charging chamber, a bypass restrictor or other features that can provide for added control of the fluid flow in the system. Methods of using the devices and methods of calculating lengths and diameters to provide a desired flow rate are also described.

A method of liquid chromatography includes providing one or more solvent reservoirs, providing a solvent pump, drawing one or more solvents into the pump in response to a pressure drop that promotes outgassing of the solvents, and dispersing outgassed bubbles into smaller bubbles to promote re-dissolution of the gas. A liquid-chromatography apparatus includes at least two solvent reservoirs, a pump, at least one bubble-dispersing unit that receives a pressurized flow of proportioned solvents from the pump, and a control unit. The control unit includes a processor and a memory that stores instructions; the control unit controls proportioning of solvents to obtain a preselected solvent composition, and pumping at flow rates to support preparative-scale or process-scale liquid chromatography.