Hong, J.* ; Maguhn, J. ; Freitag, D. & Kettrup, A. Detection of volatile organic peroxides in indoor air. Fresen. J. Anal. Chem. 371, 961-965 (2001)
Menzinger, F. ; Schmitt-Kopplin, P. ; Frommberger, M. ; Freitag, D. & Kettrup, A. Partial-filling micellar electrokinetic chromatography and non-aqueous capillary electrophoresis for the analysis of selected agrochemicals. Fresen. J. Anal. Chem. 371, 25-34 (2001)
Gawlik, B.M.* et al. River sediment (S-37) : A new analytical quality control material ensuring comparability of chlorinated hydrocarbon analysis during an international environmental study in China. Fresen. J. Anal. Chem. 367, 232-240 (2000)
Gawlik, B.M.* et al. On the presence of PCDD/Fs and other chlorinated hydrocarbons in the second generation of the European Reference Soil Set - the EUROSOILS. Fresen. J. Anal. Chem. 368, 407-411 (2000)
Zimmermann, R. ; Heger, H.J. ; Kettrup, A. & Nikolai, U.* Direct observation of the formation of aromatic pollutants in waste incineration flue gases by on-line REMPI-TOFMS laser mass spectrometry. Fresen. J. Anal. Chem. 366, 368-374 (2000)
Achatz, S. ; Lörinci, G. ; Hertkorn, N. ; Gebefügi, I. & Kettrup, A. Disturbance of the determination of aldehydes and ketones: Structural elucidation of degradation products derived from the reaction of 2,4-dinitrophenylhydrazine (DNPH) with ozone. Fresen. J. Anal. Chem. 364, 141-146 (1999)
Risse, U. ; Flammenkamp, E. ; Kettrup, A. & Vandendriessche, S.* Certification of contents of aromatic hydrocarbons in charcoal tubes - CRM 562. Fresen. J. Anal. Chem. 363, 33-37 (1999)
Schick, B. ; Risse, U. & Kettrup, A. Generation of test gases from volatile and semivolatile organic compounds (VOC/SVOC). Fresen. J. Anal. Chem. 364, 709-713 (1999)
Wolf, M. ; Teichmann, G. ; Hoque, E. ; Szymczak, W. & Schimmack, W. Copper speciation in aqueous solutions of fulvic acid and related molecular weight distributions. Fresen. J. Anal. Chem. 363, 596-599 (1999)
Zimmermann, R. ; Heger, H.J. & Kettrup, A. On-line monitoring of traces of aromatic-, phenolic- and chlorinated components in flue gases of industrial scale incinerators and cigarette smoke by direct-inlet laser ionization-mass spectrometry (REMPI-TOFMS). Fresen. J. Anal. Chem. 363, 720-730 (1999)
Lîntschinger, J. ; Schramel, O. & Kettrup, A. The analysis of antimony species by using ESI-MS and HPLC-ICP-MS. Fresen. J. Anal. Chem. 361, 96-102 (1998)
Lustig, S. ; Zang, S.* ; Michalke, B. ; Schramel, P. & Beck, W.M.* Platinum determination in nutrient plants by inductively coupled plasma mass spectrometry with special respect to the hafnium oxide interference. Fresen. J. Anal. Chem. 357, 1157-1163 (1997)
Michalke, B. Quality control in speciation investigations. Fresen. J. Anal. Chem. 350, 2-6 (1994)
Günther, W.G. ; Lintelmann, J. ; Rose, E. & Kettrup, A. Behaviour of Polycyclic Aromatic Hydrocarbons and Triazine  Herbicides in Water and Aquifer Material of a Drinking Water Recharge Plant. III: Investigations of the Behaviour of Triazine Herbicides During the Underground Passage. Fresen. J. Anal. Chem. (1993)
Oxynos, K. ; Schladot, J.D. ; Schmitzer, J. ; Backhaus, F. & Kettrup, A. Characterisation of Chlorinated Hydrocarbons in a third Generation Candidate Fish Reference  Material (Limanda limanda) Prepared under Cryogenic Conditions. Fresen. J. Anal. Chem. 345, 238-239 (1993)
Rose, E. ; Lintelmann, J. ; Günther, W.G. & Kettrup, A. Behaviour of Polycyclic Aromatic Hydrocarbons and Triazine Herbicides in Water and Aquifer- Material of a Drinking Water Recharge Plant. II: Polycyclic Aromatic Hydrocarbons (PAH) in Surface Water of the Ruhr and in Ground Water. Fresen. J. Anal. Chem. 346, 995-999 (1993)
Rose, E.* et al. Behaviour of polycyclic aromatic hydrocarbons and triazine herbicides in water and aquifer material of a drinking water recharge plant - IV. PAHs in the solid phase. Fresen. J. Anal. Chem. 347, 44-51 (1993)
Rose, E. ; Lintelmann, J. ; Günther, W.J. & Kettrup, A. Behaviour of polycyclic aromatic hydrocarbons and triazine herbicides in water and aquifer material of a drinking water recharge plant - II. Polycyclic aromatic hydrocarbons (PAHs) in surface water of the ruhr and in ground water. Fresen. J. Anal. Chem. 346, 995-999 (1993)
Schramel, P. ; Xu, L. ; Knapp, G. & Michaelis, M. Multi-elemental Analysis in Biological Samples by on-line Preconcentration on 8- hydroxyquinoline-cellulose Microcolumn coupled to Simultaneous ICP-AES. Fresen. J. Anal. Chem. 345, 600-606 (1993)
Schramel, P. & Hasse, S. Destruction of Organic Material by Pressurized Microwave Digestion. Fresen. J. Anal. Chem. 346, 794-799 (1993)
Schramel, P. & Hasse, S. Destruction of organic materials by pressurized microwave digestion. Fresen. J. Anal. Chem. 346, 794-799 (1993)
Schramel, P. ; Xu, L. ; Knapp, G.* & Michaelis, M.R.A.* Multi-elemental analysis in biological samples by on-line preconcentration on 8-hydroxyquinoline-cellulose microcolumn coupled to simultaneous ICP-AES. Fresen. J. Anal. Chem. 345, 600-606 (1993)
Michalke, B. ; Münch, D.C. & Schramel, P. Advanced Quality Control for Zinc Speciation Investigations in Human Breast Milk. Fresen. J. Anal. Chem. 344, 306-310 (1992)
Michalke, B. ; Münch, D.C. & Schramel, P. Advanced quality control for zinc speciation investigations in human breast milk. Fresen. J. Anal. Chem. 344, 306-310 (1992)
Schramel, P. & Xu, L. On-line preconcentration of arsenic from water samples with an anion-exchanger column coupled to a hydride generation ICP system. Fresen. J. Anal. Chem. 343, 373-377 (1992)
Xu, L. & Schramel, P. Determination of Gold in Sludge and Soil by Sequential ICP-AES After Preconcentration and  Separation with Thiol-Cotton Fibre. Fresen. J. Anal. Chem. 342, 179-182 (1992)
Zanco, M. ; Pfister, G. & Kettrup, A. A new HPLC method for the simultaneous determination of fluazifop-butyl and fluazifop in soil samples. Fresen. J. Anal. Chem. 344, 39-41 (1992)
Zucheng, J. & Schramel, P. Determination of trace amounts of molybdenum in water samples by inductively coupled plasma atomic emission spectrometry after cobalt-dithiocarbamate coprecipitation. Fresen. J. Anal. Chem. 343, 600-603 (1992)
Schramel, P. & Xu, L. Determination of arsenic, antimony, bismuth, selenium and tin in biological and environmental samples by continuous flow hydride generation ICP-AES without gas-liquid separator. Fresen. J. Anal. Chem. 340, 41-47 (1991)
Giese, U. ; Stenner, H. ; Ludwig, E. & Kettrup, A. Determination of Chlorinated Hydrocarbons in Single and Multi Component Test Gases. Fresen. J. Anal. Chem. 338, 610-614 (1990)
Giese, U.* ; Stenner, H.* ; Ludwig, E.M. & Kettrup, A. Determination of chlorinated hydrocarbons in single and multi component test gases. Fresen. J. Anal. Chem. 338, 610-614 (1990)
Rosner, G. ; Hötzl, H. & Winkler, R. Simultaneous Radiochemical Determination of Plutonium, Strontium, Uranium, and Iron  Nuclides and Application to Atmospheric Deposition and Aerosol Samples. Fresen. J. Anal. Chem. 338, 606-609 (1990)
Hengstmann, R. ; Hamann, R. ; Weber, H. & Kettrup, A. Comparison of Different Methods of Extraction for the Determination of Polychlorinated Dibenzo- p-dioxins in Soil. Fresen. J. Anal. Chem. 335, 982-986 (1989)
Parlar, H.A. Geochemical induced degradation of environmental chemicals. Fresen. J. Anal. Chem. 319, 114-118 (1984)
Schmidt, W.F. & Dietl, F. Bestimmung von Blei in Boden- und Sedimentaufschlüssen und -extrakten mit der flammenlosen Atomabsorption in Zirkonium-beschichteten Graphitrohren. Fresen. J. Anal. Chem. 303, 385-388 (1980)
Schmidt, W.F. & Dietl, F. Bestimmung von Cadmium in Boden- und Sedimentaufschlüssen und -extrakten mit der flammenlosen Atomabsorption in Zirkonium-beschichteten Graphitrohren. Fresen. J. Anal. Chem. 295, 110-115 (1979)