CHN determination of highly fluorinated organic compounds

24th March 2013

To accurately determine the percentage Carbon (C), Hydrogen (H) and Nitrogen (N) in highly fluorinated organic compounds, Exeter Analytical Inc. has developed a reliable analytical method using their Model 440 Elemental Analyzer.

Generally compounds containing fluorine can be successfully analysed for percentage CHN content on most elemental microanalysis systems under standard operating conditions. The magnesium oxide in the combustion tube reagent packing absorbs fluorine as HF, and releases the hydrogen. However - highly fluorinated compounds, which are often difficult to combust, can give incorrect carbon and high nitrogen data. This is believed to be due to the strength of the C-F bond. If not fully oxidized, CF2 passes through the combustion tube packing and is detected as nitrogen, resulting in both low carbon and high nitrogen data.

For these highly fluorinated compounds, Exeter Analytical have developed a new reliable analytical method based upon their Model 440 Elemental Analyzer that is described in Application Note 217.

For a copy of application note 217 please visit   or contact Exeter Analytical on +1-978-251-1411 / +44-2476-323223 or email /

Benefiting from a horizontal furnace design, the Exeter Analytical Model 440, allows analysts to routinely produce accurate and precise data on wide ranging sample types without system re-optimisation, saving precious time and reducing running costs. 

Exeter Analytical is a company dedicated to elemental analysis. Through many years of continuous investment in applications development and valuable customer feedback, the Exeter Model 440 CHN Elemental Analyzer, with its unique horizontal furnace design, is widely viewed to be the most accurate and precise analyzers available on the market today, with the broadest range of sample applications.





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