菲和镉单一及复合污染条件下在毛蚶体内的富集动力学研究

发布时间：2018-07-16 20:40

【摘要】：采用室内半静态双箱动力学模型实验,研究了菲和镉单一及复合污染条件下在毛蚶(Anadara subcrenata)体内的生物富集,通过对富集与释放过程中毛蚶体内菲和Cd的富集量进行非线性曲线拟合,获得了菲和Cd单一及复合污染条件下在毛蚶体内的吸收速率常数k1、释放速率常数k2、生物富集因子BCF、生物半衰期B1/2和平衡状态下最大富集量CA max等动力学参数。实验结果表明,菲和Cd在实验前期富集速率较高,8 d以后富集速率减缓,释放阶段与富集阶段相似。毛蚶对菲的BCF值为37.80,远大于Cd的BCF值13.12,且生物半衰期时间更长,菲更容易在生物体内富集。菲和Cd联合暴露条件下,在毛蚶体内的CA max和BCF值均大于单一作用,说明二者同时暴露时,毛蚶对菲和镉的吸收富集均有所增强。实验模型拟合度较好,输出值和实测值之间无显著性差异,拟合方程和拟合参数可信。
[Abstract]:An indoor semi static double box dynamic model was used to study the bioaccumulation of Anadara subcrenata under the single and compound pollution condition of phenanthrene and cadmium. The enrichment and release of phenanthrene and Cd in the concentration and release process were fitted by nonlinear curve, and under the single and compound pollution condition of phenanthrene and Cd, the clam was obtained. The absorption rate constant K1, the release rate constant K2, the bioconcentration factor BCF, the biological half-life B1/2 and the maximum concentration CA Max under the equilibrium state, the experimental results show that the enrichment rate of the phenanthrene and Cd is higher in the early stage of the experiment, the enrichment rate is slow after 8 D, and the release stage is similar to the enrichment stage. The BCF value of the clam to phenanthrene is 37. .80, which is far greater than the BCF value of Cd, is 13.12, and the biological half-life time is longer, and the phenanthrene is more easily enriched in the organism. Under the combined exposure of phenanthrene and Cd, the CA Max and BCF values in the body of the clam are all larger than the single action. It shows that the absorption and enrichment of the phenanthrene and cadmium in the clam are enhanced when the two are exposed at the same time. The experimental model has a better fitting degree, the output value and the value of the experimental model. There is no significant difference between the measured values, and the fitting equation and fitting parameters are credible.
【作者单位】：天津市海洋资源与化学重点实验室;天津科技大学海洋与环境学院;
【基金】：天津市应用基础与前沿技术研究计划(15JCYBJC23200)资助项目
【分类号】：X171.5;X55

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