Comparison and influence of two newly produced Iranian oil dispersants (Pars1 &Pars2) with the Gamlen OD4000 on rainbow trout

Dispersants are the group of chemicals, designed to be sprayed on to the oil slicks to accelerate the process of natural dispersion. In this study, the acute toxicity of two newly produced Iranian oil dispersants (Pars1 &Pars2) was evaluated and compared to the Gamlen OD 4000 in different concentrations on 28–32 g of rainbow trout (Oncorhynchus mykiss). The 50% of lethal concentration (LC50) of 96-h acute toxicity of exposed fish were determined by means of Probit value and ANOVA test. Relative effectiveness toxicity (RET) of all oil dispersants according to their LC50 has been measured. Pars1 has the lowest RET (12.56) in contrast to Pars2 (RET = 47.51) and Gamlen OD4000 (RET = 21.34) proved to have the highest efficiency and to be the best one under the laboratory conditions used in this study.