SENSITIVITY ASSESSMENT OF Biomphalaria glabrata (SAY, 1818) TO SURFACTANT SODIUM DODECYL SULFATE (SDS) FOR ECOTOXICOLOGICAL ANALYSES

Abstract

Abstract Sodium dodecyl sulfate (SDS) is an anionic surfactant widely used in domestic and professional cleaning products. Currently, it is known that there is a large release of this compound in the aquatic environment, which can cause biochemical and physiological changes at several trophic levels. Therefore, it is relevant to determine the effects on organisms of environmental and public health importance, such as the freshwater snail Biomphalaria glabrata. In this work, acute and developmental ecotoxicity assays with gastropods were performed to evaluate and to establish a sensitivity control chart with SDS. Adults and embryos were exposed to the surfactant for 24 hours at concentrations between 12.5 and to 300 mg L− 1, as well as a control group. Adults were more sensitive to SDS than embryos stages. It was observed for adults LC50 of 36.87 mg L− 1 and a differential sensitivity in each embryonic stage (EC50 = blastulae 58.59, gastrulae 74.45, trochophore 95.24 and veliger 157.89 mg L− 1). Snails presented release of hemolymph and mucus, body out of the shell and penile overexposure during and after exposure. Teratogenic effects were evidenced at all embryonic stages. The difference in results obtained in adults and embryos reinforces the importance of carrying out analyzes at different developmental stages. The serial assays established with SDS for B. glabrata showed efficiency and constancy conditions for the ecotoxicity assays with good laboratory practice standards.