Abstract
This paper presents results of experiments on the effects of aromatic compounds on photosynthesis by a freshwater alga. The first objective of these experiments was to screen rapidly several classes of common aromatic compound, to identify those which are most toxic to the alga. The classes tested were unsubstituted aromatic hydrocarbons, aromatic quinones, aromatic amines, methylated aromatics, phenols, azaarenes, and thiophenes. Because aromatics containing 4 or more rings are practically insoluble in water, even solutions saturated with such aromatics are generally not acutely toxic to aquatic organisms. For this reason, only 1-, 2-, and 3-ring compounds were tested. The second objective was to determine ranges of toxic concentrations for the compounds tested, to facilitate further toxicological studies. Each compound was therefore tested over 3 to 5 orders of magnitude of concentration.
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