Acute and Joint Toxicity of Two Organosilicon Surfactantswith Three Pesticides to Brachydanio rerio

In order to assess the effect of organosilicon surfactant on aquatic organisms,the acute and joint toxicity of ethoxy modified trisiloxane (JIERUN) and siloxane compound (High-Speed) with three pesticides were studied using zebrafish (Brachydanio rerio) as test organism by semi-static method.The results showed that "JIERUN" and "High-Speed" were middle and low toxicity to zebrafish,respectively.The Co-Toxicity Coefficient (CTC) of "JIERUN" with fipronil,indoxacarb and acephate to zebrafish was 139.52,107.24 and 165.65,respectively,so the joint action was synergistic,additive and synergistic,respectively.The CTC of "High-Speed" with fipronil,indoxacarb and acephate to zebrafish was 111.36, 48.26 and 80.08 respectively,so the joint action was additive,antagonistic and additive,respectively.