%0 conference lecture (invited) %@ %A Xie, Z.,Ebinghaus, R.,Caba, A.,Lakaschus, S.,Ruck, W. %D 2004 %J Occurrence and elimination of trace contaminants in waste water treatment and environmental compartments %N %P %T Investigation on a mass balance for the nonylphenol in the North Sea – the relative importance of air - sea gas exchange %U %X