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21 results on '"Messerschmidt, Jürgen"'

11. Relevance and analysis of traffic related platinum group metals (Pt, Pd, Rh) in the aquatic biosphere, with emphasis on Palladium

Author

Sures, Bernd, Zimmermann, Sonja, Messerschmidt, Jürgen, and von Bohlen, Alex

Subjects
Biologie
Abstract

Following the introduction of automobile catalysts in the middle of the Eighties in Germany there is an increasing emission of the platinum-group-metals (PGM) platinum (Pt), palladium (Pd) and rhodium (Rh). Still, it remains unclear if these metals are bioavailable for aquatic animals and to which extent they accumulate in the aquatic biosphere. Zebra mussels (Dreissena polymorpha ) were maintained in water containing road dust at a concentration of 1 kg/10 l. Following an exposure period of 26 weeks, soft tissues of the mussels were analysed applying adsorptive cathodic stripping voltammetry (ACSV) for the determination of Pt and Rh and total-reflection X-ray fluorescence analysis after co-precipitation of Pd with mercury. This experiment revealed for the first time that all the three catalyst emitted metals were accumulated by mussels. The bioaccumulation increased in the following manner: Rh<>

Published
2002

21. Speciation of platinum metabolites in plants by size-exclusion chromatography and inductively coupled plasma mass spectrometry

Author

Klueppel, Dirk, Jakubowski, Norbert, Messerschmidt, Jürgen, Stuewer, Dietmar, and Klockow, Dieter

Abstract

The multi-element capability of ICP-MS was exploited in a study of platinum metabolization in plants. Grass was cultivated with and without treatment with a Pt containing solution. Platinum species were extracted and separated by ultrafiltration into two mass fractions. The low molecular mass (&lt;10 kDa) fraction was investigated by size-exclusion chromatography coupled on-line to ICP-MS. Five Pt containing fractions could be distinguished in the chromatograms. Conclusions on the binding partners of Pt could be drawn from multi-element determinations of some selected elements (C, S, Ca, Pb) that are co-eluted with Pt. For two of them (S, Ca), the higher mass resolution available with a double focusing magnetic field ICP-MS instrument was applied in order to cope with problems from spectroscopic interferences.

Published
1998

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