用生物模拟采样技术研究硝基芳烃在鱼体内的富集和降解
SIMULATION OF THE ACCUMULATION AND DEGRADATION OF NITROAROMATICS IN FISH BY A BIOMIMETIC SAMPLING TECHNOLOGY
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摘要: 生物模拟采样技术的一个典型代表是三油酸酯/半渗透膜采样器件(SPMD),是将鱼体内的一种典型中性脂封装在一个半渗透膜内,允许水相污染物跨膜在内侧脂相富集,原理和生物富集过程相似。本研究在实验室控制条件的流动体系中,研究了九种典型低疏水性的硝基芳烃化合物在SPMD和金鱼体内的富集动力学过程,探讨利用SPMD模拟硝基芳烃化合物在金鱼体内的富集,并和同期进行的金鱼富集实验结果比较,讨论该类污染物在金鱼体内降解的构效关系。结果表明,SPMD能够用模拟鱼从水体中亲脂性富集硝基芳烃化合物的过程,富集系数和化合物正辛醇/水分配系数相似;当SPMD和鱼暴露于同一浓度水体时,SPMD富集系数和BCF之间的差别能够表征该化合物在鱼体内的酶促降解过程。Abstract: The representative biomimetic sampling technology is the triolein-filled semi-permeable membrane device(SPMD), in which hydrophobic organic pollutants could be accumulated in the similar way as that in fish. In the study, SPMD and goldfish(Crassius auratus)were simultaneously exposed to nine weakly hydrophobic nitroaromatics in a laboratory continuous-flow experimental system. Our results showed that the accumulation of the nitroaromatics in SPMD and in fish was compared and good correlation between device concentration factor and the octanol/water distribution coefficients of the compounds. When exposing to the same concentration, the difference between device concentration factor and bioconcentration factor represents the characteristics of the enzymatic degradation of nitroaromatics in goldfish.
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Keywords:
- Biomimetic sampling /
- Biodegradation /
- Nitroaromatics /
- Goldfish
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