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[D-2.1 Studies on seasonal and spatial distribution of hazardous chemicals]

[Contact Person]

Kunugi Masayuki
Senior Researcher
Marine Environment Team
National Institute for Environmental Studies
Environment Agency
Onogawa 16-2, Tsukuba, Ibaraki, 305-0053 Japan
Tel:+81-298-50-2434 Fax:81-298-50-2569
E-mail:kunugi@nies.go.jp

[Total Budget for FY1995-FY1997]

20,841,000 Yen (FY1997;7,246,000 Yen)

[Abstract]

Hazardous chemicals in the sea are liable to be accumulated in marine ecosystem, and are transported by such mechanisms as oceanic and atmospheric currents. It is important to study these mechanisms in the ocean in order to understand the nature and extent of marine pollution from hazardous chemicals.

A continuous-extraction sampling system for hazardous chemicals was developed and set up on a ferry (Kurosiwo). The extraction rate of this system, tested in a laboratory and in situ, was found to be over 90%. The detection limit in 50 L of extracted seawater was about 5 pgL^-1 for chlordane and 10 pgL^-1 for HCHs.

More than 70 samples were collected on the ferry (Kurosiwo) route from Osaka to Naha, [Japan. Hazardous chemicals in the samples were extracted by acetone and concentrated to l mL, then determined by the GC/MS-SIM method. Levels of organic halide chemicals such as trans-chlordane ranged from the detection limit to 30 pgL^-1, while α-HCH and β-HCH varied from 30 to 400 pgL^-1.

[Key Words]

Hazardous Chemicals, POPs, East-Asian Seas, Spatial distribution, VOS