1. Institute of Soil Research, Univ. of Natural Resources and Life Sciences; Peter-Jordan-Str. 82 A-1190 Vienna Austria
2. Dep. of Health and Environment; Austrian Institute of Technology; A-3430 Tulln Austria
3. Institute of Applied Geology, Univ. of Natural Resources and Life Sciences; Peter-Jordan-Str. 70 A-1190 Vienna Austria
4. Aerospace and Advanced Composites (AAC Research); A-2444 Seibersdorf Austria
5. Dep. of Chemistry; Univ. of Natural Resources and Life Sciences; Muthgasse 18 A-1190 Vienna Austria