Lumex Instruments - Laboratory Analytical Equipment manufacturer Logo
Lumex Instruments (0890278 B.C. Ltd.) Unit 207, 31510 Gill Ave., Mission, B.C., V4S0A1, Canada 31510 (0890278 B.C. Ltd.) Unit 207, 31510 Gill Ave., Mission, B.C., V4S0A1, Canada
+1 866-233-6057, +1 604 820-4486,

Lumex Instruments

Insight into mysteries of Nature
  • Laboratory, Industrial and Field instruments

    Analytical Instruments
    from traditional technologies to ingenious solutions

  •  More than 1,000 applications

    Variety of Applications
    from well-known standards to customized analytical methods

  • Worldwide support and service

    Worldwide Support & Service
    from East to West around the world

  • Analytical equipment
  • Analytical equipment
  • Analytical equipment
  • Analytical equipment


Mercury determination in natural gas


The natural gas is a significant source of ingres s of mercury in the environment. The typical mercury concentration in natural gas may vary from 0.01 to 200 μ g/m3 . Mercury, being present in hydrocarbon gas, initiates corrosion of pipelines and catalyst poiso ning during gas transportation and processing, and these effects have serious implications for the gas-processing industry.

Mercury extraction and purification of gases, as well as processing the products of gas deposits, which involve mercury separating as a fairly toxic element, is very important for the env ironment protection. It is important ev en in cases when mercury is not an appreciable component in the natural gas: the huge amounts of world annual gas consumption should be taken into account.

The use of a mercury analyzer RA-915M/RA-915+ with Zeeman background correction of nonselective absorption provides direct real-time merc ury determination in natural gas at a ng/m3 level.


The method of atomic mercury concentration measuring in natural gas is based on the use of atomic absorption spectrometry with Zeeman background correction employed in a mercury analyzer RA- 915M/RA-915 +. The use of the Zeeman background correction and a multipath analytical cell provides high selectivity and sensitivity of measurements, essentially reducing the effect of interfering compounds. Thus, even with 25% hydrogen sulfide content in the gas (whose non-selective absorption amounts to 93%) the detection limit doesn’t exceed 0.5 μ g/m 3.

As a result, the analyzer provides direct determination of mercury in a hydrocarbon gas due to the elimination of preliminary precipitation and collection of mercury in absorption traps. Therefore, analyses can be carried out with the ultra low detection limit (0.01 μ g/m 3) in real time. To perform a measurement, the analyzer is placed near a gas well or other sampling point (gas pipeline, string, separator, etc). The gas flows continuously through Teflon hoses into the RP-91NG attachment and then arrives to the analytical cell.

The gas flow rate is controlled by a valve. The blank signal is regularly checked by passing the gas through a special filter with the Hg absorption efficiency of 98–99%. If necessary, a simple device is mounted upstream of the instrument to separate the gas from a liquid phase (water, condensate or oil). The mercury concentration is measured once per second and is processed by a computer with a simultaneous data display.

If it is impossible to carry out direct analysis near a sampling point, the gas can be analyzed in a laboratory. In this case, it is recommended to deliver the gas samples to the laboratory in special bags made of materials that don’t absorb mercury (e.g., Tedlar® gas sampling bags).

Mercury determination in natural gasDownload application file