Abstract
The toxicity of ten polynuclear aromatic hydrocarbons (PNAs) to Neanthes arenaceodentata was studied in replicate 96 h bioassays with specific hydrocarbons in solution. Relative solubilities for each PNA were derived in short-term equilibration experiments. Disappearance of representative di-, tri, tetra- and pentacyclic-aromatic hydrocarbons from test solutions was also characterized by ultraviolet spectrophotometry. PNA toxicity and residence time in test solutions were directly related to molecular weight (MW), while relative solubility is inversely related to MW. 96 h TL m values for the diaromatic PNAs naphthalene, 2,6-dimethylnaphthalene, and 2,3,6-trimethylnaphthalene were 3.8, 2.6 and 2.0 ppm, respectively. Phenanthrene, fluorene and 1-methylphenanthrene (triaromatics) exhibited 96 h TL m values of 0.6, 1.0 and 0.3 ppm, respectively. None of the tetra- and pentacyclic-aromatics (chrysene, 3,4-benzo( a)pyrene, 1,2,5,6-dibenzanthracene) were toxic up to the highest concentration tested (1 ppm), excepting fluoranthene, with a 96 h TL m of 0.5 ppm. PNA toxicity appears to be related to both solubility and residence time in test solutions.
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