Model of biota-sediment accumulation factor for polycyclic aromatic hydrocarbons
Model of biota-sediment accumulation factor for polycyclic aromatic hydrocarbons
复制标题
DOI：
10.1002/etc.5620180534
复制
发表时间：
1999-05-01
影响因子：
4.1
通讯作者：
Komlos, J
中科院分区：
文献类型：
--
作者：
Thomann, RV;Komlos, J
使用小溪底栖食物网的稳态表示构建了 PAH 的 BSAF 模型。对其他人收集的沉积物、小龙虾和翻车鱼 PAH 数据的分析表明，对于小龙虾来说，log K-ow 上的 BSAF（kg arg C kg 脂质(-1)）范围相对较窄，在 0.01 和 0.1 之间。对于翻车鱼来说。随着滞后 K-ow 增加到 0.00001 至 0.005 的值，台站平均 BSAF 显着下降。 PAH 基团的行为也发生分离，未取代的 PAH 构成整个 PAH 组的近似下限。小龙虾和翻车鱼 BSAF 的模型校准是通过分配从实验室数据得出的 PAH (K-ow) 函数来完成的。与未取代的多环芳烃相比，取代的萘的行为与多氯联苯相似，但低约一个数量级。模型校准分析表明：（1）相对于翻车鱼，小龙虾似乎表现出较低的新陈代谢和较高的肠道同化效率，导致 BSAF 与翻车鱼 BSAF 不同； (2) 对于翻车鱼，未取代的 PAH 的 BSAF 随着 K-ow 的增加而迅速下降，主要是因为肠道同化效率低和代谢增加，而不是因为沉积物 PAH 的生物利用度降低； (3)食物途径和水途径对BSAF的相对贡献随K-ow的变化而变化。
A model of the BSAF is constructed for PAHs using a steady-state representation of a benthic food web of a smalt creek. Analyses of the data collected by others on sediment, crayfish and sunfish PAH indicate that for the crayfish, the BSAF (kg arg C kg lipid(-1)) range over log K-ow is relatively narrow between 0.01 and 0.1. For the sunfish. a marked decline occurs in the station average BSAF with increasing lag K-ow to values ranging from 0.00001 to 0.005. A separation also occurs in the behavior of the PAH groups, with the unsubstituted PAHs constituting an approximate lower bound on the entire set of PAHs. Model calibration to crayfish and sunfish BSAF is accomplished through assignment of PAH (K-ow) functions derived from laboratory data. The substituted naphthalenes in contrast to the unsubstituted PAHs are calculated to behave similarly to PCBs but lower by about one order of magnitude. Analyses of the model calibration indicate that (1) relative to the sunfish, the crayfish appear to exhibit reduced metabolism and higher gut assimilation efficiencies resulting in BSAFs different from sunfish BSAFs; (2) for the sunfish, the BSAF for unsubstituted PAHs declines rapidly with increasing K-ow primarily because of low gut assimilation efficiency and increased metabolism and not because of reduced bioavailability of sediment PAH; and (3) the relative contribution of the food route and water route to the BSAF varies with K-ow.