COHIBA newsletter 1/2011 presents the results of the Work package 3 water sampling programme and whole effluent toxicity testing.
The COHIBA project has detected traces of 11 hazardous substances in treated waste waters discharged to the Baltic Sea area. Although none of these compounds is acutely toxic to aquatic organisms at the measured concentrations, the results of the water sampling programme indicated some toxic effects in treated effluents. However, it is not possible directly to blame on these 11 analysed compounds for the harmful effects, and in the respect of these compounds the reason for toxicity leaves inexplicable.
The Baltic Sea countries are being advised to increasingly apply whole effluent toxicity testing in waste water control to complement conventional chemical analyses. Discharges must be regulated on the basis of their overall environmental impacts.The newsletter head lines are: