Affiliation: | 1. Department of Chemistry , University of Oulu , FIN-90014 Oulu, PO Box 3000, Finland pekka.vahaoja@oulu.fi;3. Department of Chemistry , University of Oulu , FIN-90014 Oulu, PO Box 3000, Finland;4. Suomen Ymp?rist?palvelu Oy , Kiilakiventie 1 , FIN-90250 Oulu, Finland |