离子液体[C8mim]PF6对水生生物的毒性作用

运用评价化学品对水生生物毒性的标准试验方法,探讨离子液体1-辛基-3-甲基-咪唑六氟磷酸盐(C8mim]PF6)对普通小球藻、大型蚤和斑马鱼的毒性影响.结果表明,C8mim]PF6在实验浓度下,对普通小球藻的生长和叶绿素a的产生均有抑制作用,浓度越高抑制作用越明显,且对叶绿素a含量的影响更为显著.高浓度组(200mg/L)可致死部分小球藻细胞;C8mim]PF6对大型蚤的48h LC50为4.47mg/L,属于高毒性;C8mim]PF6对斑马鱼的96h LC50为126.08mg/L,属于低毒性.C8mim]PF6对这3种水生生物的抑制率/致死率(EC50/LC50)随时间呈规律性变化.C8mim]PF6与藻类的亲和性及其亲脂特性可能是其对水生生物存在潜在毒性的2个主要原因.

Toxicity of [C8mim]PF6 to aquatic organisms

Three standard test methods for evaluating the toxicity of chemicals to aquatic organisms were applied to assess the toxic effects of l-octyl-3-methylimidazolium PF_6(C_8mim]PF_6)on the three aquatic organisms: Chlorella vulgaris, Daphnia magna and zebra fish. Growth and chlorophyll a content of C. vulgaris were inhibited in the experimental content of C_8mim]PF_6, the inhibiting effect increased significantly with increasing concentrations, and the toxic effects on chlorophyll a content were stronger than that of growth. The C. vulgaris cell even would be lethal in the higher concentration group (200mg/L). The toxic effects of C_8mim] PF_6 was high-toxic to Daphnia magna, while was low-toxic to zebra fish, and the 48h LC_(50) and 96h LC_(50) was 4.47mg/L and 126.08mg/L, respectively. EC50/LC50 changed regularly with the test time. Maybe the two main reasons leading to the potential threat to the aquatic organisms were the affinity of C_8mim]PF_6 with algae and lipophilic property itself.