沥青中总氮的测量

analytikjena analytikjena Fields of Application / Industry： Chemistry / Polymer Industry Clinical Chemistry / Medicine/Hygiene / Health Care Cosmetics Electronics Energy Environment/Water/Waste Food / Agriculture Geology / Mining Material Analysis Metallurgy/ Galvanization Pharmacy Refineries/ Petrochemistry Semi-Conductor Technology Others Short Application multi EASeriesDetermination of Nitrogen in Bitumen Introduction Bitumen is a valuable material in the construction industry and in road construction. It is used thereas sealing material and for water protection. Bitumen occurs during the vacuum distillation ofpetroleum in the state of a high-viscosity， almost solid mixture of highly molecular aliphatic andaromatic hydrocarbon compounds. This mixture contains， depending on origin and pretreatment ofthe distilled petroleum， more or less large quantities of organically bonded nitrogen， sulfur andchlorine. These elements are not desired and can initiate corrosion processes， which can lead todefective quality up to destruction of building and pavements. Bitumen can contain up to 5000 ppmnitrogen and 80，000 ppm sulfur. Sample Preparation and Analysis An analyzer of the mult EA Series was used with multi matrix sampler for the tests in thehorizontal operation mode. The bitumen samples to be tested were diluted with a suitable nitrogen-free solvent (e.g. toluene) before the analysis due to its high viscosity. The dilutions so createdwere injected into quartz boats with the aid of the autosampler. Afterwards the boats were fed intothe combustion system by means of the automatic boat drive. Thereby the fed speed is controlledby the flame sensor. The quantitative thermal decomposition was done in a two-phase process.The nitrogen content of the samples was determined with the help of a chemo-luminescencedetector Method settings The method TN_hori_liquid of the standard method library was used for analyzing. Prior to the actual determination of the nitrogen content， the system was calibrated using standardsolutions (pyridine in isooctane). Results Sample cN [ppm] SD [ppm] RSD [%] Bitumen A 276 5 1.8 Bitumen B 316 4 1.3 Bitumen C 603 12 1.9 Bitumen D 2440 38 1.6 Standard 500 ppm 500 16 0.5 Summary The horizontal operation mode of the analyzers of the multi EA Series are outstandingly suited forthe determination of nitrogen contents in Bitumen and related matrices. The multi-matrix samplerallows an optimal adjustment of the sample introduction to the requirements of the matrix to beanalyzed. During parallel operation of a UV fluorescence detector the sulfur content can bedetermined simultaneously. Moreover， the application spectrum can be expanded with additionalaccessory modules to include the parameters chlorine and carbon. Duplication and distribution permitted with reference to source. 2008 Analytik Jena AG Publisher： Analytik Jena AG 07745 Jena Konrad-Zuse-StraBe 1 Phone +49 (0) 3641/77-70Fax +49 (0)3641/77-9279 Publisher：Analytik Jena AG07745 JenaKonrad-Zuse-StraBe 1 Determination of Nitrogen in BitumenReference Number： EA N e|GRO/