BASELINE LEVELS OF CADMIUM, CHROMIUM, COPPER, LEAD AND ZINC IN SEA WATER FROM THE GULF OF THAILAND

MANUWADI HUNGSPREUGS

ABSTRACT: A realistic baseline levels of cadmium, chromium, copper, lead and zinc in the seawater from the Gulf of Thailand were obtained. Two cruises were made in the Upper Gulf, one on September 26-29, 1981, when the river run-off was high, and another on February 1-4, 1982, during the low run-off period. For the Lower Gulf, one cruise was made during 12-26 August, 1982. The results show the concentration ranges for dissolved cadmium, chromium, copper, lead and zinc to be 0.01 to 0.11, 0.20 to 0.29, 0.50 to 2.00, 0.01 to 1.16 and 4.0 to 21.0 gl^-1 respectively. These are much lower than previous reports by other authors. Possible explanations are given.

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Department of Marine Science, Faculty of Science, Chulalongkorn University, Phya Thai Rd., Bangkok Thailand.

Received 17 November 1982