Abstract
Alkylphenols are used as raw material of alkylphenol polyethoxylate-type non-ionic surfactant and these substances exist most widely in environmental water. Recently, these substances are known as endocrine disruptors. We collected water sediment, blue mussel and plankton samples in Harimanada which is located in the Seto Inland Sea; Hyogo, Japan. Nonylphenol(NP) in the all samples were determined by gas chromatography/mass spectrometry. The behavior of nonylphenol in water environments was discussed.