College of Environment, Hohai University, Nanjing 210098, China; National Center of Oceanographic Standards and Metrology, Tianjin 300112, China.
College of Environment, Hohai University, Nanjing 210098, China; Key Laboratory of Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China.
Mar Pollut Bull. 2017 May 15;118(1-2):79-84. doi: 10.1016/j.marpolbul.2017.01.065. Epub 2017 Feb 17.
There is a high degree of heavy oil partitioning into marine sediments when an oil spill occurs. Contaminated sediment, as an endogenous pollution source, can re-pollute overlying water slowly. In this study, a static oil release process and its effects in marine sediment was investigated through a series of experiments with reproductive heavy oil-contaminated marine sediment. The oil release process was accurately simulated with a Lagergren first-order equation and reached equilibration after 48h. The fitted curve for equilibrium concentration (C) and first-order rate constant (k) for sediment pollution levels exhibited a first-order log relationship. The instantaneous release rate (dCdt) was also calculated. The C increased with increases in temperature and dissolved organic matter (DOM), and decreasing salinity. The k increased with temperature, but was not affected by DOM and salinity. These results can be used to better understand the fate of heavy oil in contaminated sediments of the Bohai Sea.
当发生溢油事故时，大量重油会分配到海洋沉积物中。受污染的沉积物作为内源污染源，会缓慢地再次污染上覆水。本研究通过一系列具有再生性的重油污海洋沉积物实验，对海洋沉积物中的静态溢油释放过程及其影响进行了研究。利用 Lagergren 一级方程准确模拟了溢油释放过程，48h 后达到平衡。平衡浓度 (C) 和一级速率常数 (k) 的拟合曲线表现出一级对数关系。还计算了瞬时释放率 (dC/dt)。C 随着温度、溶解有机质 (DOM) 的增加和盐度的降低而增加。k 随温度升高而增加，但不受 DOM 和盐度影响。这些结果可用于更好地了解渤海重油污沉积物中重油的归宿。
