摘要
模拟海底微环境,研究促使C4,C5异构体分异的因素。39 d后,i-C4/n-C4变化率:灭菌固液混合组为1.67%,灭菌固液分离组为7.96%,未灭菌固液混合组为2.54%,未灭菌固液分离组为14.21%;i-C5/n-C5变化率:灭菌固液混合组为1.19%,灭菌固液分离组为8.18%,未灭菌固液混合组为2.26%,未灭菌固液分离组为10.19%。表明海底环境对烷烃组分产生复杂的溶解、吸附和生物降解作用,使异构体产生分异效应;碳原子数增加,综合作用相对减弱;同碳原子数,对正构烷烃的作用效果更显著。碳同位素分析发现:i-C4,n-C4,i-C5,n-C5的δ13C均有微弱的变重趋势,CO2的δ13C则发生明显的变轻趋势,并且未灭菌组比灭菌组变化大。表明海底环境使烷烃组分发生了碳同位素分馏,生物降解作用显著。
The factors leading to differentiation of C4 and C5 in submarine environment were studied by simulating the submarine environment in the laboratory. The results showed that after 39 days, the changing rate of i-C4/n-C4 was 1.67% in sterile solid-liquid mixing headspace vial, 7.96% in sterile solid-liquid separate one, 2.54% in non-sterile solid-liquid mixing one, and 14.21% in non-sterile solid-liquid separate one. On the other hand, the changing rate of i-Cjn-C5 was 1.19% in sterile solid-liquid mixing headspace vial, 8.18% in sterile solid-liquid separate one, 2.26% in non-sterile solid-liquid mixing one, and 10.19% in non-sterile solid-liquid separate one. These showed that the factors causing differentiation of Ca and C5 include the complex solution, adsorption and biodegradation. And with the increase of carbon atoms, the combined effects were weakened. The effects on the n-alkanes were more significant if the hydrocarbons have the same number of carbon atoms. The carbon isotopic composition analysis showed that the δ13C of i-C4, n-Ca, i-C5 and n-C5 was heavier, but the δ13C of CO2 was relatively lighter. The changes of non-sterile test group were more significant than the sterilized test group. These showed that the submarine environment caused carbon isotope fractionation in the hydrocarbon components, and the biological degradation played an important role in the submarine environment.
出处
《海洋科学》
CAS
CSCD
北大核心
2014年第9期69-74,共6页
Marine Sciences
基金
"127"国家专项项目(GZH201100310)
