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石油是海洋环境中的一类重要污染物,为探索石油烃在海洋生物体内的生物富集动力学特征,应用半静态双箱动力学模型在室内模拟了黑鲷(Sparus macrocephlus)对0#柴油和东海平湖原油水溶性成分(Water accommodated fraction,WAF)的生物富集实验,通过对富集与释放过程中黑鲷体内石油烃的动态检测以及对检测结果的非线性曲线拟合,获得黑鲷对0#柴油、原油WAF的吸收速率常数k1、释放速率常数k2、生物富集因子BCF、平衡状态下黑鲷体内石油烃含量CAmax和生物学半衰期B1/2等动力学参数.拟合结果得到的各动力学参数分别为:黑鲷对0#柴油WAF的吸收速率常数k1范围为3.46-4.87、k2为0.047 6-0.070 8、BCF为48.79-102.30、CAmax为1.53-2.93 mg/kg、B1/2为9.79-14.57 d;黑鲷对原油WAF的吸收速率常数k1范围为2.12-5.75、k2为0.036 3-0.050 5、BCF为58.35-147.21、CAmax为4.01-7.00 mg/kg、B1/2为13.71-19.08 d.黑鲷对0#柴油、原油WAF的吸收速率常数k1、BCF均随外部水体中石油烃浓度的增大而减少,对0#柴油和原油WAF的释放速率常数k2与外部水体中石油烃浓度无明显相关性,CAmax整体随外部水体中石油烃浓度的增大而增大.对模型的拟合优度检验结果显示,模型的拟合优度良好.研究表明,0#柴油在黑鲷体内的富集量低于原油WAF、释放量略高于原油WAF,不同种类石油的烃类组分可能是主要控制因子之一.
Petroleum is a kind of important pollutant in the marine environment. In order to explore the biologically enrichment kinetic characteristics of petroleum hydrocarbons in marine organisms, semi-static two-compartment dynamic model was used to simulate the effects of Sparus macrocephlus And the water-absorbed fraction (WAF) of Pinghai Lake in the East China Sea. The black sea bream was obtained through the dynamic detection of petroleum hydrocarbons in black sea bream during enrichment and release and the non-linear curve fitting to the test results The absorption rate constant k1, release rate constant k2, bioaccumulation factor BCF, petroleum hydrocarbon content CAmax and biological half-life B1 / 2 of 0 # diesel oil and WAF crude oil at equilibrium were obtained. The fitting results obtained The kinetic parameters of black sea bream for 0 # diesel WAF were 3.46-4.87, 0.047 6-0.070 8, BCF 48.79-102.30, CAmax 1.53-2.93 mg / kg, B1 / 2 was 9.79-14.57 d; the absorption rate constants k1 of black sea bream for WAF were 2.12-5.75, k2 was 0.036 3-0.050 5, BCF was 58.35-147.21, CAmax was 4.01-7.00 mg / kg, B1 / 2 For the 13.71-19.08 d black seabream on the 0 # diesel, crude oil WA F absorption rate constants k1 and BCF both decrease with the increase of petroleum hydrocarbon concentration in the external water. There is no obvious correlation between the release rate constant k2 of 0 # diesel and crude WAF and the petroleum hydrocarbon concentration in the external water. Hydrocarbon concentration increased.Furthermore, the goodness of fit test of the model showed that the goodness of fit of the model was good.Research shows that the enrichment amount of 0 # diesel in black seabream is lower than that of crude oil, the release amount is slightly Hydrocarbons above the WAF of crude oils and different types of petroleum may be one of the major controlling factors.