摘要:
PFOS及其4种替代品对两栖动物非洲爪蟾和黑斑蛙蝌蚪的急性毒性结果为:用调聚法合成的织物三防整理剂对非洲爪蟾蝌蚪和黑斑蛙蝌蚪的96 h-LC50分别为8和21 mg·L-1,而PFOS对两种蝌蚪的96 h-LC50分别为92和81 mg·L-1。此实验结果说明织物三防整理剂的急性毒性高于PFOS。用电解氟化法合成的C4、C6织物三防整理剂和50%的全氟丁基有机铵盐阳离子表面活性剂浓度在100 mg·L-1时,对两种蝌蚪都没有毒性。这说明,从急性毒性的角度,C4、C6织物三防整理剂和表面活性剂可作为PFOS的替代品使用,但是织物三防整理剂的急性毒性比PFOS大,作为替代品使用应慎重考虑。另外,PFOS和织物三防整理剂对黑斑蛙蝌蚪的急性毒性与对非洲爪蟾蝌蚪的急性毒性存在差异。出于保护我国本土两栖动物的目的,使用黑斑蛙开展毒性评价比使用非洲爪蟾更有现实意义。
Abstract:
In this paper, the acute toxicity of perfluorooctane sulfonate (PFOS) and four substitutes on Xenopus laevis tadpoles and Rana nigromaculata tadpoles were compared. 96 h-LC50 for tri-fabric finishing agent synthetized using telomerization method (tri-fabric finishing agent) on Xenopus laevis tadpoles and Rana nigromaculata tadpoles were 8 and 21mg·L-1, respectively, while that for PFOS on the two tadpoles were 92 and 81mg·L-1. It is indicated that acute toxicity of tri-fabric finishing agent is significantly higher than PFOS. The other three alternatives C4 and C6 tri-proof finishing agents (C4 and C6 emulsion) synthetized by electrolysis fluorination method, and 50% perfluorobutyl organic ammonium salt cationic surfactant (50% cationic surfactants) are not toxic to tadpoles at the concentration of 100 mg·L-1. Therefore, to acute toxicity, C4, C6 emulsion and 50% cationic surfactants can be used as substitutes for PFOS, however, tri-fabric finishing agent should not be a alternative of PFOS. The toxicity of PFOS and tri-fabric finishing agent on Rana nigromaculata tadpoles is different from that on Xenopus laevis tadpoles. To protect local amphibians in China, it is of practical significance that toxicity assessment will be carried out using Rana nigromaculata rather than Xenopus laevis.
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