A MODIFICATION OF THE VIBRIO-HARVEYI TOXICITY TEST FOR INCREASED VOLUMES UP TO 9 FOLD

This study evaluated toxicity of three organics, dibutyl methanephosph onate, diethyl methanephosphonate and diisopropyl methanephosphonate, using both a standard published procedure and a modified procedure of the Vibrio harveyi direct toxicity test. Evaluation of this modified p rocedure was performed by separate inclusion of two sediments, sand an d soil, and water(buffer). The modification allows an increased volume of chemical up to 9 fold. These data suggest that interactions with s ediment are different at 1 fold and 9 fold volumes. Toxicity of each c hemical is presented as its median effective concentration, molarity a nd bioluminescent counts.