SINTEF Materials and Chemistry, Environmental Technology, Dept. Applied Environmental Biology and Chemistry, N-7465 Trondheim, Norway.
SINTEF Materials and Chemistry, Environmental Technology, Dept. Applied Environmental Biology and Chemistry, N-7465 Trondheim, Norway.
Mar Pollut Bull. 2014 Jul 15;84(1-2):125-34. doi: 10.1016/j.marpolbul.2014.05.027. Epub 2014 Jun 11.
Physically and chemically (Corexit 9500) generated Macondo 252 oil dispersions, or emulsions (no Corexit), were prepared in an oil-on-seawater mesocosm flume basin at 30-32 °C, and studies of oil compound depletion performed for up to 15 days. The use of Corexit 9500 resulted in smaller median droplet size than in a physically generated dispersion. Rapid evaporation of low boiling point oil compounds (C⩽15) appeared in all the experiments. Biodegradation appeared to be an important depletion process for compounds with higher boiling points in the dispersions, but was negligible in the surface emulsions. While n-alkane biodegradation was faster in chemically than in physically dispersed oil no such differences were determined for 3- and 4-ring PAH compounds. In the oil dispersions prepared by Corexit 9500, increased cell concentrations, reduction in bacterial diversity, and a temporary abundance of bacteria containing an alkB gene were associated with oil biodegradation.
在 30-32°C 的油-海水中观模拟水槽中制备了物理化学（科锐思 9500）生成的马孔多 252 号油分散体或乳剂（无科锐思 9500），并对油化合物的消耗进行了长达 15 天的研究。科锐思 9500 的使用导致中值液滴尺寸小于物理生成的分散体。在所有实验中，低沸点油化合物（C ⩽15）都迅速蒸发。在分散体中，对于沸点较高的化合物，生物降解似乎是一种重要的消耗过程，但在表面乳剂中则可以忽略不计。虽然在化学分散的油中烷烃生物降解比物理分散的油更快，但 3- 和 4-环 PAH 化合物没有这种差异。在科锐思 9500 制备的油分散体中，细胞浓度增加、细菌多样性减少以及含有 alkB 基因的细菌暂时丰度与油的生物降解有关。
