PJB-1986-19
BIOASSAY STUDIES OF PHYTOPLANKTON OF COASTAL WATERS OF KARACHI IN RELATION TO HEAVY METAL POLLUTION: I. EFFECT OF COPPER AND LEAD ON SKELETONEMA COST ATI]M
SHAUKAT HAY AT KHAN1 AND S.M. SAIFULLAH2
Abstract
Toxic effects of copper and lead on a local diatom species Skeletonema costatum were studied using bioassay technique. Copper inhibited growth at a concentration of 10 Mg Cu I 1 and killed the cells at and above 30
Mg Cu l"1. Lead inhibited growth, the lowest tolerance limit being 50 Mg Pb l"1. The effect of both metals increased with age of culture and a significant inverse rela¬tionship
existed between their concentrations and growth of the spccies. The combined effect
of copper and lead on the species was
synergistic.
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