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2,4,6-Trinitrotoluene (TNT) is one of the most prevalent high explosives in the environment. 2,4-Dinitrotoluene (2,4-DNT) and 2,6-dinitrotoluene (2,6-DNT) are the most common isoforms of dinitrotoluene. The goal of this study was to determine the acute toxic effects of TNT, 2,4-DNT, and 2,6-DNT in adult male bullfrogs. The LD(50) for TNT was 1,060 mg/kg BW while the LD(50 )for 2,4-DNT and 2,6-DNT was 1,098 mg/kg BW. All three compounds elicited similar symptoms of toxicity including changes of skin color, body weight, development of seizures, liver and kidney necrosis, and lung cyanosis. Relative organ weights did not show significant change.

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