The fate of TNT and its degradation products in marine environment has been investigated by the Division of NBC Defence on behalf of the Swedish Armed Forces. To mimic leakage of TNT from dumped ammunition in the sea, water and sediment from three different sea dumping locations were collected. From the Baltic Sea, one location with aerobic and onte with anaerobic sediment were collected. From the western sea one aerobic sediment was chosen. The degradation study showed that TNT was rapidly transformed and more than 90 % of the 14C-TNT was firmly adsorbed to the sediment after 80 days of incubation. In the present report the toxicity of water and sediment extract from the TNT degradation study was investigated on the harpacticoid copepod, Nitocra spinipes. The extraction was performed at high pressure (10 MPa) and at 150oC and even firmly adsorbed TNT degradation products would loose contact with the sediment. The results of this study showed that neither the water nor the extract of the sediments were acute toxic to N. spinipes.