Results and Discussion
Two different techniques were applied for the extraction and clean-up of the standard solution
and waste samples (influent - effluent), as described in the experimental part. Comparing these two
methods, the sample-enrichment with gas stripping [6] had the advantage that no degradation of
oligomers to NP was observed. On the contrary, in the column technique [3] a systematic quantitative
degradation of the oligomers (about 25%) to NP Was observed (Fig. l a, b).