The impact of heated effluents from the condenser outfall of the Madras Atomic Power Station (MAPS), on the flora and fauna settled on an iron pile in the discharge area was studied. At temperatures ranging between 27.2 to 31.0 "C, the sedentary community was composed of epiphytic algae, sea anemo-

The catalytic activity of three tertiary amines and three organotin compounds in the cure reaction of blocked isocyanate with hydroxylterminated polybutadiene was investigated. It was found that the steric factor determines the catalytic activity of the compound. The tin compounds showed higher catalytic activities than the amine compounds. The deblocking catalytic activity of the amine and tin compounds was confirmed by the identification of isocyanate functionality using infrared spectroscopy. The synergistic effect of amine and tin mixed catalysts systems in the deblocking reaction was reported for the first time.

No abstract

No abstract

We studied the effect of various concentrations of chlorine, used in the cooling system of Madras Atomic Power Station (MAPS), on the primary productivity of entrained phytoplankton from October 1988 to December 1990. The rates of primary productivity (gross) were lower at the discharge point than in the intake area. The reduction in productivity ranged from 30 to 70% at low-dose chlorination (residual chlorine 0.05-0.20 mg 1~ ' at the discharge point). During shock-dose chlorination, when residual chlorine at the discharge point ranged from 1.10 to 1.50 mg l-', the reduction in productivity was 80-83 %. A reduction of 16-17% was recorded without chlorination.