1. Dep. of Remediation Res., Centre for Environm. Res., Leipzig-Halle GmbH; Permoserstr. 15 D-04318 Leipzig Germany
2. Dep. of Chemistry; Lomonosov Moscow State Univ.; Leninskie Gory 119899 Moscow Russia
3. Univ. of Karlsruhe, Engler-Bunte Inst.; Engler-Bunte-Ring 1 D-76131 Karlsruhe Germany