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[D-2.2 The Origin and Accumulation of Hazardous Substances in East-Asian Seas (Final Report)]

[Contact Person]

Mamoru Tominaga
Hydrospheric Environmental Protection Department,
National Institute for Resources and Environment,
Agency of Industrial Science and Technology, MITI
16-3 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
Tel:+81-298-58-8338 Fax:+81-298-58-8338
E-mail:p1702@nire.go.jp

[Total Budget for FY1995-FY1997]

23,954,000 Yen (FY1997;6,066,000 Yen)

[Abstract]

Organohalogen and organotin compounds in seawater were measured to clarify the occurrence and behavior of hazardous substances in East-Asian seas. An in situ filtration/adsorption water sampler was developed to collect the dissolved and suspended matters separately. Vertical profiles and isomer patterns of PCBs were determined by using this sampler and multi-dimensional GC. The total concentrations of PCBs ranged from 150 to 1140 fg/dm³ in Siribesi Trough. The isomer patterns of PCBs suggested that Siribesi Trough during summer is stratified into four layers (50-500, 500-1500, 1500-2500 and 3000-3500 m). Principle component analysis indicated that the PCB contamination in each layer may reflect the history of the water bodies. Gas chromatography combined with ICP-MS was developed for the determination of organotins. The detection limit was improved 100 times. The concentrations of organotins in dissolved fraction increased in the order of tri-

[Key Words]

Marine pollution, Organotin, Organohalogen Compounds, Mussel