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Exeter Analytical has revealed that a growing number of laboratories are using its Model 440 CHN elemental analyser to accurately determine percentage organic and inorganic carbon levels at different parts of the carbon cycle.

The carbon cycle is the biochemical process by which carbon is exchanged among the biosphere, pedoshere, geosphere, hydrosphere and atmosphere of the Earth. Along with the nitrogen cycle and the water cycle, the carbon cycle comprises a sequence of events that are key to making the Earth capable of sustaining life.

The Model 440 CHN elemental analyser is able to provide accurate results expressed in micrograms of total carbon and nitrogen detected.

After sample acidification, the organic carbon content can be determined. Total carbon minus organic carbon gives the inorganic content.

Key benefits

  • The analyser’s horizontal furnace design simplifies the removal of sample ash between each marine sediment or soil analysis; consequently, one combustion tube will analyse in excess of 1,000 sediment/soil samples without the need for removal and cleaning.
  • The Model 440 provides the capacity to process filters that are used in applications for river/oceanographic analysis. 
  • Filters measuring up to 47mm in diameter can be processed in one analytical cycle; by comparison, other elemental analysers, employing vertical furnace designs, need cleaning after as little as 20 samples and larger filters have to be sub-sampled several times and then corrective calculations made to enable analysis.
  • Effectively eliminating troublesome residue build-up, the gas flow characteristics of the Model 440 analyser are claimed to be superior to other elemental analysers, thereby providing longer-term calibration stability, as well as enhanced accuracy and precision for measured sample data.
  • As the Model 440 provides complete control over combustion parameters, it is able to reproducibly achieve 100 per cent combustion with a wide range of marine sediment and soil samples.

Exeter Analytical

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