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125 results on '"Klockow, Dieter"'

3. Degradation of alpha-pinene on tenax during sample storage: effects of daylight radiation and temperature

Author

Schrader, Wolfgang, Geiger, Jutta, Klockow, Dieter, and Korte, Ernst-Heiner

Subjects
Pollution control industry -- Research, Environmental issues, Science and technology
Abstract

Adsorption cartriges of Tenax TA are either placed in sunlight, wrapped in aluminum foil, or stored in a refrigerator and analyzed for the behavior of alpha-pinene degradation and products. The products of alpha-pinene storage under different conditions are charted, including the prime compounds of pinocarveol, pinocarvon, verbenon, verbonol, and myrtenal.

Published
2001

4. Investigation of the adsorption of gaseous aromatic compounds at surfaces coated with Heptakis(6-thio-6-deoxy)-beta-cyclodextrin by surface-enhanced Raman scattering

Author

Hill, Wieland, Fallourd, Valerie, and Klockow, Dieter

Subjects
Cyclodextrins -- Research, Aromatic compounds -- Research, Raman effect -- Analysis, Hydrocarbons -- Analysis, Chemicals, plastics and rubber industries
Abstract

A study was conducted to analyze the preparation and characteristics of a multithiolated derivative of beta-cyclodextrin. Surface-enhanced Raman scattering was utilized to carry out the analysis. The capability of an immobilized derivative to absorb polycyclic aromatic hydrocarbons was then demonstrated. Results indicated that the strong adsorbed portion has promoted the detection of concentrations in the ppm range with comparatively large response time.

Published
1999

10. CONFERENCES & MEETINGS

Author

Smyth, John C., Westing, Carol E., Klockow, Dieter, Polunin, Nicholas, Feng, Liu, Willemsen, E. M., Lorang, Emile, David, H., and Wai, Wilson W.

Published
1987

44. Speciation of nickel in airborne particulate matter by means of sequential extraction in a micro flow system and determination by graphite furnace atomic absorption spectrometry and inductively coupled plasma mass spectrometry

Author

Füchtjohann, Lars, Jakubowski, Norbert, Gladtke, Dieter, Klockow, Dieter, and Broekaert, José A. C.

Abstract

A four-stage sequential extraction procedure for the speciation of nickel has been applied to ambient aerosol samples. The determination of the soluble, sulfidic, metallic and oxidic Ni fractions in particulate matter was carried out by graphite furnace (electrothermal) atomic absorption spectrometry (ETAAS) and inductively coupled plasma mass spectrometry (ICP-MS). An EDTA solution, a mixture of diammonium citrate and hydrogen peroxide, and a KCuCl3 solution were used as leaching agents for the determination of the soluble, sulfidic and metallic species, respectively, and nitric acid was used for the determination of oxidic compounds after microwave digestion of particulate matter sampled on filters. A new micro scale filter holder placed in a closed flow injection analysis (FIA) system for use in nickel speciation by means of sequential extraction, and the results of the optimisation of the extraction conditions are described. The temperature program for ETAAS was optimised for all extraction solutions with the aid of temperature curves. Pyrolysis temperatures of 900, 600 and 1000 °C were found to be optimum for EDTA, hydrogen peroxide plus ammonium citrate and KCuCl3-containing solutions, respectively. Airborne dust was sampled on filters at two locations near to a metallurgical plant in Dortmund, Germany. Concentrations in the low ng m−3 range down to the detections limits (0.1–0.3 ng m−3) and various nickel species were found to be present in the collected dust. The mean fractions of total nickel (sampling period of one month) were found to contain 36 ± 20% of soluble, 6 ± 4% of sulfidic, 11 ± 15% of metallic and 48 ± 18% of oxidic nickel.

Published
2001

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