How Nitrogen & Hydrogen Gas Generator Works in Gas Chromatograph

Selection of the carrier gas in gas chromatography is crucial for the efficiency and accuracy of the analysis. Although this choice is often dictated by the type of detector used, many detectors allow you to work with different gasses. As the carrier gas is nitrogen, air, argon, helium, and hydrogen. At this helium having high mobility and complete chemical inertia, traditionally regarded as the best option. Recently, however, preference is increasingly given to hydrogen, and many manufacturers recommend the use of chromatographic equipment is the gas in these devices.

Many types of gas chromatography with the passage of helium for hydrogen are quite simple and do not complicate the analysis. At the same time, high performance hydrogen generator at high speeds of the carrier gas provides a distinct advantage for those users who want to increase the capacity of their laboratories without compromising the quality of the analyzes. Moreover, the use of hydrogen reduces the limits of detection of substances to lower the temperature analysis and extend the life of the chromatography column.

One major advantage of the hydrogen - the possibility of obtaining in situ as needed via a hydrogen generator by electrolysis of water. The generators are capable of producing hydrogen gas chromatographic purity as required with the output flow rate of 500 ml per minute (30 l / h), thus allowing the carrier gas several chromatographic systems. This eliminates the need for inconvenient working cylinders of compressed gas.

If already used in the laboratory the hydrogen generator to supply chromatograph FID detector, using it as a carrier gas for the production of the most logical and justified regarding cost increments.

One major advantage of the hydrogen - the possibility of obtaining in situ as needed via a hydrogen generator by electrolysis of water. The generators are capable of producing hydrogen gas chromatographic purity as required with the output flow rate of 500 ml per minute (30 l / h), thus allowing the carrier gas several chromatographic systems. It eliminates the need for inconvenient working cylinders of compressed gas.

Perhaps, the only thing users have a concern when considering the transition to hydrogen as a carrier gas - its flammability. However, current hydrogen generators are designed to ensure maximum safety of the devices. Gas never builds up inside the generators and instruments themselves are equipped with leak detectors and automatic shutdown systems, thus eliminating even the slightest possibility of accumulation of dangerous concentrations of gas.

Nitrogen air production technology with the use of adsorption processes in nitrogen generators has been well studied and widely applied in industrial facilities for the recovery of high purity nitrogen.

The operating principle of a nitrogen generator using the adsorption technology is based on the dependence of the adsorption rates of various components of the gas mixture pressure factors and temperature. Among nitrogen adsorption plants of different types, pressure swing adsorption (PSA) plants have found the widest application worldwide.

Analytic chemistryNitrogen generator is required for the various forms of analytical chemistry such as liquid chromatography-spectrometry and gas chromatography where continuous, and a stable supply of nitrogen is required. Probably shortly, the Nitrogen will continue to be actively used for certain applications of gas chromatography. However, the high cost and unlimited reserves of Nitrogen on the one hand and availability, efficiency and environmental friendliness of the other hydrogen guarantee that with time the hydrogen will play an increasingly important role in gas chromatography.

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