Research Product

Several estuarine animals were exposed to sodium pentachlorophenate (Na-PCP), in flow-through toxicity tests. The following are test animals and their 96-hr LC50 values: grass shrimp (Palaemonetes pugio), greater than 515 µg/l; brown shrimp (Penaeus aztecus), >195 µg/l; longnose killifish (Fundulus similis), >306 µg/l; pinfish (Lagodon rhomboides), 53.2 µg/l; and striped mullet (Mugil cephalus), 112 µg/l. The 192-hr EC50 (effect measured was shell deposition) for the eastern oyster (Crassostrea virginica) was 76.5 µg/l. Eastern oysters exposed to Na-PCP concentrations of 25.0 and 2.5 µg/l accumulated the chemical in their tissues an average of 41 and 78 times, respectively. After Na-PCP delivery was discontinued, however, the oysters purged themselves of the pesticide within four days.