1,2,4-三氯苯对3种海洋微藻的毒性效应

1,2,4-三氯苯(1,2种,4-TCB)是环境中普遍存在的持久性有机污染物之一,而1,2,4-TCB对藻类的毒性作用报道很少。以1,2,4-TCB处理后,3种海洋微藻(金藻Isochrysis Zhanjiangensis、角毛藻Platymonas Subcordiformis和扁藻Chaetoceros miielleri)的生长状况、蛋白质质量分数和叶绿素质量分数的改变来检测1,2,4-TCB对海洋微藻的毒性效应。结果表明:1,2,4-TCB对3种海洋微藻的生长均有一定的抑制作用,该效应表现出一定的浓度和时间依赖性;1,2,4-TCB处理4d后,3种海洋微藻细胞蛋白质质量分数和叶绿素质量分数下降,呈现一定的浓度—效应关系,这表明1,2,4-TCB对3种海洋微藻产生毒害效应,其作用机制可能与藻类光合作用功能降低和蛋白质功能受损有关。1,2,4-TCB在一定程度上降低了藻类饵料的利用价值,而且对食物链下游生物具有潜在的危害性。

The toxic effects of 1,2,4-trichlorobenzene on three kinds of ocean tiny algae

1,2,4-trichlorobenzene (1,2,4-TCB) is one of the most widely used persistent organic pollutants. However, the studies of 1,2,4-TCB on the algae were rarely discussed. Toxic effects of 1,2,4-trichlorobenzene (1,2,4-TCB ) on three kinds of ocean tiny algae (Isochrysis Zhanjiangensis, Chaetoceros miielleri, Platymonas Subcordiformis) were studied through the changes of growth of algae, the protein contents and the chlorophyll contents. The results showed the growth of algae was inhibited by 1,2,4-TCB in treated time-response and dose-response manners. The protein contents and the chlorophyll contents were decreased after 4 d 1,2,4-TCB treatment in dose-response manners. It suggested that 1,2,4--trichlorobenzene has toxic effects on three ocean tiny algae. The mechanism may relate to the functional damage of algal photosynthesis and the damage of protein structures. 1,2,4-TCB decreased the values of algae as baits. Furthermore, 1,2,4-TCB would have potential toxic effects for the other kinds of organisms and human.