The Dumas method starts with a combustion furnace (CF) to burn the sample, obtaining elemental compounds. Water is removed by a first physical trap (WT1 - DriStep™), placed after the combustion, and a second chemical one (WT2). Between the two, the elemental substances passed through a reduction furnace (RF).
The auto-regenerative CO2 absorbers (CO2) let pass only the elemental nitrogen that is detected by the LoGas™ innovative Thermal Conductivity Detector (TCD) with no requirement for a reference gas. The NDA 702 is controlled through the intuitive DUMASoft™.
Conclusion
Results are extremely reliable and reproducible, as demonstrated by the RSD, by using helium or argon as carrier gas, with the same conditions (method and sample weight) since the goal is to obtain < 2.0% relative standard deviation, as requested by official methods. The obtained values fell within the expected nitrogen range of each standard material certified by WEPAL, demonstrating the high performance of NDA702.
Helium remains the best choice for premium accuracy but its shortages and interruptions are affecting any related product or instrument, including elemental analyzers. Argon, the best alternative available, proved to be a valid substitute, ensuring optimal results. VELP Scientifica
NDA 702 Dual Carrier Gas Dumas Nitrogen Analyzer is the perfect response for simple, fast and precise nitrogen/protein determination, both with Helium and Argon as carrier gas.