三氯异氰尿酸在模拟水生态系统中归趋的研究

利用高效液相色谱法对三氯异氰尿酸(TCCA)在微宇宙模拟水生态系统中的归趋,包括TCCA在水体、沉积物、生物体(皇冠草、河蚬、异育银鲫)等不同分配相及生物体不同组织中的分布、富集以及迁移等动态变化过程进行了研究.结果表明:TCCA进入模拟水生态系统后,除发生水解外,其余或被水生生物所吸收,或者沉降进入底泥中.水生生物对TCCA有不同程度的富集和残留.水草对TCCA的吸收较大,尤其是叶片部分;河蚬、鱼体对TCCA具有明显的吸收积累,并且在体内的残留时间较长,不同组织对TCCA的吸收积累存在明显的差别,在内脏中的积累量比肌肉组织高.不同生物对TCCA的分布和富集存在着较大的差异,其趋势为皇冠草>河蚬>异育银鲫.

Dynamics and fate of TCCA in a simulated micro-cosmos system

Distribution, accumulation and transfer dynamics of TCCA in water, sediments, and biota in a simulated micro-cosmos system were studied by HPLC. The results showed that once TCCA was released into water body, some were hydrolyzed in aqueous solutions; some were assimilated by aquatic organisms or precipitated into sediments. There were differences in distribution, accumulation and transfer dynamics of TCCA among different aquatic organisms. Echinodorus amazonicus adsorbed TCCA mainly by its leaf instead of its roots and reached to an equilibrium quickly; Allogynogenetic crucian carp and Corbicula fluminea had obvious ability to accumulate TCCA, which could retain in these organisms for a long time. Significant differences of TCCA bioaccumulation existed between visceral and muscle, and higher concentration of TCCA was found in visceral tissues. It was found that bioaccumulations of TCCA varied with species, and the order was Echinodorus amazonicus>Corbicula fluminea>Allogynogenetic crucian carp.