Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Effects of residual chlorine in sea water on the photosynthetic activity of three marine algae
Student Author(s): Schreiber, James R.
Faculty Advisor(s): Abbott, Isabella
Pages: 26
Location: Final Papers Biology 175H
Date: June 1970
Keywords: sewage pollution
Abstract: This project involved the determination of the persistence of residual Chlorine in sea water and the detmination of any effects, either adverse or positive, or residual Chlorine from chlorinated sewage effluents on the photosynthetic activities of three representative algae, Prinonitis lanceolata (Rhodophyta), Ulva lobata (Chlorophyta), and Macrocystis pyrifera (Phaeophyta). By using the technique of quantitative C14 -O2 uptake to measure the reates of photosynthesis, a correlation between the concentrations of Sodium Hypochlorite in the experimental media and the experimental rates of photosynthetic activity was discovered. The results show that a residual level of 5 ppm Chlorine in sea water does adversely affect the photosynthetic activities of these algae, in the case of Ulva lobata by as much as 25%. Higher concentrations of residual chlorine have even greater effects, with 15 ppm residual chlorine giving an 80% reduction in the photosynthetic rate of Macrocystis pyrifera.