@misc{WangFischerWieprechtetal., author = {Wang, Haijing and Fischer, Thomas and Wieprecht, Wolfgang and M{\"o}ller, Detlev}, title = {A predictive method for crude oil volatile organic compounds emission from soil: Evaporation and diffusion behavior investigation of binary gas mixtures}, series = {Environmental Science and Pollution Research}, journal = {Environmental Science and Pollution Research}, issn = {0944-1344}, doi = {10.1007/s11356-014-4049-3}, pages = {9}, abstract = {Due to their mobility and toxicity, crude oil volatile organic compounds (VOCs) are representative components for oil pipeline contaminated sites detection. Therefore, contaminated location risk assessment, with airborne light detection and ranging (LIDAR) survey, in particular, requires ground-based determinative methods for oil VOCs, the interaction between oil VOCs and soil, and information on how they diffuse from underground into atmosphere. First, we developed a method for determination of crude oil VOC binary mixtures (take n-pentane and n-hexane as examples), taking synergistic effects of VOC mixtures on polydimethylsiloxane (PDMS) solid-phase microextraction (SPME) fibers into consideration. Using this method, we further aim to extract VOCs from small volumes, for example, from soil pores, using a custom-made sampling device for nondestructive SPME fiber intrusion, and to study VOC transport through heterogeneous porous media. Second, specific surface Brunauer-Emmett-Teller (BET) analysis was conducted and used for estimation of VOC isotherm parameters in soil. Finally, two models were fitted for VOC emission prediction, and the results were compared to the experimental emission results. It was found that free diffusion mode worked well, and an empirical correction factor seems to be needed for the other model to adapt to our condition for single and binary systems.}, language = {en} } @misc{WangGeppertFischeretal., author = {Wang, Haijing and Geppert, Helmut and Fischer, Thomas and Wieprecht, Wolfgang and M{\"o}ller, Detlef}, title = {Determination of Sucrose in Honey with Derivatization/Solid-Phase-Microextraction and Gas-Chromatography/Mass Spectrometry.}, series = {Journal of Chromatographic Science}, volume = {53}, journal = {Journal of Chromatographic Science}, number = {9}, doi = {10.1093/chromsci/bmv044}, pages = {1427 -- 1431}, abstract = {A new method for the determination of sucrose in honey with derivatization solid-phase microextraction and gas chromatography/mass spectrometry (D-SPME-GC/MS) was developed. The method incorporates a sample derivatization with acetic anhydride using N-methylimidazole as the catalyst and the subsequent enrichment of the analyte in a Polyacrylate-SPME fiber. Results show that 100 µL N-methylimidazole and 800 µL acetic anhydride were sufficient to complete the acetylation for sucrose in 100 µL aqueous sample at room temperature. For SPME, an enrichment time of 30 min was sufficient. SPME was performed by immersing the fiber into the solution with additional vibration. Then, the analyte was desorbed for 5 min at 280°C in the GC/MS injection port with splitless mode. The present method exhibits good linearity at a concentration range of 0.3-8\% of sucrose in honey with excellent regression (R = 0.9993). The method has been successfully applied to the control of sucrose adulteration in honey.}, language = {en} } @misc{WangFischerWieprechtetal., author = {Wang, Haijing and Fischer, Thomas and Wieprecht, Wolfgang and M{\"o}ller, Detlev}, title = {A predictive method for volatile organic compounds emission from soil: Evaporation and diffusion behavior investigation of a representative component of crude oil}, series = {Science of the Total Environment}, volume = {530-531}, journal = {Science of the Total Environment}, issn = {1879-1026}, doi = {10.1016/j.scitotenv.2015.05.063}, pages = {38 -- 44}, language = {en} } @misc{WangGeppertFischeretal., author = {Wang, Haijing and Geppert, Helmut and Fischer, Thomas and Wieprecht, Wolfgang and M{\"o}ller, Detlev}, title = {Determination of volatile organic and polycyclic aromatic hydrocarbons in crude oil with efficient gas-chromatographic methods}, series = {Journal of Chromatographic Science}, volume = {53}, journal = {Journal of Chromatographic Science}, number = {5}, issn = {1945-239X}, doi = {10.1093/chromsci/bmu113}, pages = {647 -- 654}, abstract = {Determination of volatile organic compounds (VOCs) in crude oil, such as super volatile organic compounds (super VOCs) and simple polycyclic aromatic hydrocarbons (PAHs), is vital for targeting crude oil spill spots. In this study, a static headspace gas chromatography flame ionization detection method was established for determination of super VOCs in crude oil with both external and internal standard determination, which can be used in the field when using portable gas chromatography. Identification was done by comparing the retention time with the corresponding standards and quantitation was done with a new one-drop method. Another simplified and efficient method was performed to analyze volatile PAHs in crude oil, which can also be used in field analysis. Toluene was used as the extraction solvent for PAHs in crude oil. Method validation for both analyses was satisfactory. The result showed that n-butane and n-pentane were maximum super VOCs and naphthalene, phenanthrene and fluorene were the main PAHs in the crude oil studied. The super VOCs quantity ranged from 3 to 6\% and the main PAHs consisted of 0.02-0.06\% of studied crude oil.}, language = {en} } @inproceedings{AckerMoellerWieprechtetal., author = {Acker, Karin and M{\"o}ller, Detlev and Wieprecht, Wolfgang and Auel, Renate and Kalaß, Dieter}, title = {Results of cloud physical and chemical measurements in low clouds observed at Mt. Brocken, Germany}, series = {Proceedings, 2nd International Conference on Fog and Fog Collection, St. John's, Canada, July 15 - 20, 2001}, booktitle = {Proceedings, 2nd International Conference on Fog and Fog Collection, St. John's, Canada, July 15 - 20, 2001}, address = {North York}, isbn = {0-9683887-1-X}, pages = {117 -- 120}, language = {en} } @article{AckerWieprechtAuel, author = {Acker, Karin and Wieprecht, Wolfgang and Auel, Renate}, title = {Coupling of wet denuder and ion chromatography technique for sensitive measurements of nitrous and nitric acid in Melpitz}, series = {Journal of Aerosol Science}, volume = {32}, journal = {Journal of Aerosol Science}, number = {Supplement 1}, issn = {0021-8502}, pages = {523 -- 524}, abstract = {(Abstracts of the European Aerosol Conference 2001)}, language = {en} } @article{AckerMoellerWieprechtetal., author = {Acker, Karin and M{\"o}ller, Detlev and Wieprecht, Wolfgang and Auel, Renate and Kalaß, Dieter and Tscherwenka, W.}, title = {Nitrous and nitric acid measurements inside and outside of clouds at Mt. Brocken}, series = {Water, Air and Soil Pollution}, volume = {130}, journal = {Water, Air and Soil Pollution}, number = {1-4}, issn = {0043-1168}, pages = {331 -- 336}, language = {en} } @inproceedings{MoellerWieprechtHofmeisteretal., author = {M{\"o}ller, Detlev and Wieprecht, Wolfgang and Hofmeister, J. and Kalaß, Dieter and Elbing, F. and Ulbricht, M.}, title = {Fog dissipation by dry ice blasting process mechanism}, series = {Proceedings, 2nd International Conference on Fog and Fog Collection, St. John's, Canada, July 15 - 20, 2001}, booktitle = {Proceedings, 2nd International Conference on Fog and Fog Collection, St. John's, Canada, July 15 - 20, 2001}, address = {North York}, isbn = {0-9683887-1-X}, pages = {485 -- 491}, language = {en} } @misc{MuellerSpindlerBrueggemannetal., author = {M{\"u}ller, Konrad and Spindler, G. and Br{\"u}ggemann, E. and Gnauk, T. and Koziar, C. and Schwarz, Jaroslav and Cafmeyer, Jan and Maenhaut, W. and Even, A. and Kok, J. and Berner, A. and Ctyroky, P. and Hitzenberger, R. and Galambos, Z. and Tursic, J. and M{\"a}kela, Timo and Laitinen, A. and Acker, Karin and Wieprecht, Wolfgang and Hillamo, Risto and Streit, N.}, title = {The "INTERCOMP 2000" in Melpitz - an EUROTRAC-2 Activity}, series = {Journal of Aerosol Science}, volume = {32}, journal = {Journal of Aerosol Science}, number = {Supplement 1}, issn = {0021-8502}, pages = {1021 -- 1022}, language = {en} } @article{SchwarzenboeckWieprechtMertesetal., author = {Schwarzenb{\"o}ck, A. and Wieprecht, Wolfgang and Mertes, S. and Heintzenberg, J.}, title = {Cloud droplet residual sizes and residual mass concentration in specific drop size classes}, series = {Journal of Aerosol Science}, volume = {32}, journal = {Journal of Aerosol Science}, number = {Supplement 1}, issn = {0021-8502}, pages = {205 -- 206}, abstract = {(Abstracts of the European Aerosol Conference 2001)}, language = {en} } @article{WieprechtStielerHeinzeetal., author = {Wieprecht, Wolfgang and Stieler, M. and Heinze, G. and M{\"o}ller, Detlev and Riebel, Ulrich and Hofmann, E. and Sparmann, A. and Kalaß, Dieter and Acker, Karin and Auel, Renate}, title = {Droplet concentrations (LWC) and its chemical composition after gas cleaning in the lignite firwed power plant J{\"a}nschwalde (FRG)}, language = {en} }