%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 %T Investigation on a mass balance for the nonylphenol in the North Sea – the relative importance of air - sea gas exchange %U %X