TY - GEN A1 - Wang, Haijing A1 - Fischer, Thomas A1 - Wieprecht, Wolfgang A1 - Möller, Detlev T1 - A predictive method for crude oil volatile organic compounds emission from soil: Evaporation and diffusion behavior investigation of binary gas mixtures T2 - Environmental Science and Pollution Research N2 - 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. Y1 - 2015 U6 - https://doi.org/10.1007/s11356-014-4049-3 SN - 0944-1344 SN - 1614-7499 ER - TY - GEN A1 - Wang, Haijing A1 - Geppert, Helmut A1 - Fischer, Thomas A1 - Wieprecht, Wolfgang A1 - Möller, Detlef T1 - Determination of Sucrose in Honey with Derivatization/Solid-Phase-Microextraction and Gas-Chromatography/Mass Spectrometry. T2 - Journal of Chromatographic Science N2 - 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. Y1 - 2015 U6 - https://doi.org/10.1093/chromsci/bmv044 VL - 53 IS - 9 SP - 1427 EP - 1431 ER - TY - GEN A1 - Wang, Haijing A1 - Fischer, Thomas A1 - Wieprecht, Wolfgang A1 - Möller, Detlev T1 - A predictive method for volatile organic compounds emission from soil: Evaporation and diffusion behavior investigation of a representative component of crude oil T2 - Science of the Total Environment Y1 - 2015 U6 - https://doi.org/10.1016/j.scitotenv.2015.05.063 SN - 1879-1026 VL - 530-531 SP - 38 EP - 44 ER - TY - GEN A1 - Wang, Haijing A1 - Geppert, Helmut A1 - Fischer, Thomas A1 - Wieprecht, Wolfgang A1 - Möller, Detlev T1 - Determination of volatile organic and polycyclic aromatic hydrocarbons in crude oil with efficient gas-chromatographic methods T2 - Journal of Chromatographic Science N2 - 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. Y1 - 2014 U6 - https://doi.org/10.1093/chromsci/bmu113 SN - 1945-239X VL - 53 IS - 5 SP - 647 EP - 654 ER - TY - CHAP A1 - Acker, Karin A1 - Möller, Detlev A1 - Wieprecht, Wolfgang A1 - Auel, Renate A1 - Kalaß, Dieter T1 - Results of cloud physical and chemical measurements in low clouds observed at Mt. Brocken, Germany T2 - Proceedings, 2nd International Conference on Fog and Fog Collection, St. John’s, Canada, July 15 - 20, 2001 Y1 - 2001 SN - 0-9683887-1-X SP - 117 EP - 120 CY - North York ER - TY - JOUR A1 - Acker, Karin A1 - Wieprecht, Wolfgang A1 - Auel, Renate T1 - Coupling of wet denuder and ion chromatography technique for sensitive measurements of nitrous and nitric acid in Melpitz JF - Journal of Aerosol Science N2 - (Abstracts of the European Aerosol Conference 2001) Y1 - 2001 SN - 0021-8502 VL - 32 IS - Supplement 1 SP - 523 EP - 524 ER - TY - JOUR A1 - Acker, Karin A1 - Möller, Detlev A1 - Wieprecht, Wolfgang A1 - Auel, Renate A1 - Kalaß, Dieter A1 - Tscherwenka, W. T1 - Nitrous and nitric acid measurements inside and outside of clouds at Mt. Brocken JF - Water, Air and Soil Pollution Y1 - 2001 SN - 0043-1168 SN - 0049-6979 VL - 130 IS - 1-4 SP - 331 EP - 336 ER - TY - CHAP A1 - Möller, Detlev A1 - Wieprecht, Wolfgang A1 - Hofmeister, J. A1 - Kalaß, Dieter A1 - Elbing, F. A1 - Ulbricht, M. T1 - Fog dissipation by dry ice blasting process mechanism T2 - Proceedings, 2nd International Conference on Fog and Fog Collection, St. John’s, Canada, July 15 - 20, 2001 Y1 - 2001 SN - 0-9683887-1-X SP - 485 EP - 491 CY - North York ER - TY - GEN A1 - Müller, Konrad A1 - Spindler, G. A1 - Brüggemann, E. A1 - Gnauk, T. A1 - Koziar, C. A1 - Schwarz, Jaroslav A1 - Cafmeyer, Jan A1 - Maenhaut, W. A1 - Even, A. A1 - Kok, J. A1 - Berner, A. A1 - Ctyroky, P. A1 - Hitzenberger, R. A1 - Galambos, Z. A1 - Tursic, J. A1 - Mäkela, Timo A1 - Laitinen, A. A1 - Acker, Karin A1 - Wieprecht, Wolfgang A1 - Hillamo, Risto A1 - Streit, N. T1 - The "INTERCOMP 2000" in Melpitz - an EUROTRAC-2 Activity T2 - Journal of Aerosol Science Y1 - 2001 SN - 0021-8502 VL - 32 IS - Supplement 1 SP - 1021 EP - 1022 ER - TY - JOUR A1 - Schwarzenböck, A. A1 - Wieprecht, Wolfgang A1 - Mertes, S. A1 - Heintzenberg, J. T1 - Cloud droplet residual sizes and residual mass concentration in specific drop size classes JF - Journal of Aerosol Science N2 - (Abstracts of the European Aerosol Conference 2001) Y1 - 2001 SN - 0021-8502 VL - 32 IS - Supplement 1 SP - 205 EP - 206 ER -