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High-performance liquid chromatography and combined gas chromatographymass spectrometry were used to study the presence of indole-3-acetic acid (IAA) in the northern Adriatic Sea. In 1990 and 1991, samples from 10 stations were taken and seasonal and regional distributions of IAA were examined. We found IAA in samples collected from Stns 1 & 2 (September 1990 and August 1991) and from Stn 6 (August 1991). The semiquantitatively estimated IAA concentration was on the order of 10-' M. The relationship between the presence of IAA and the mucilage phenomenon was considered.

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