岩矿测试2018，Vol.37Issue(2)：164-174,11.DOI:10.15898/j.cnki.11-2131/td.201707100117
渤海沉积物中甲烷氧化速率及同位素分馏规律研究
Study on Oxidation Rate and Isotope Fractionation of Methane in Bohai Sea Sediments
摘要
Abstract
BACKGROUND:The Bohai Sea contains a large amount of oil and gas,the main component of which is methane.The influence of natural or human factors will cause its leakage and migration and then have a negative impact on the environment. However,most of the methane would be oxidized by microorganisms during the leakage and migration processes. Meanwhile,the different environmental conditions will affect oxidation rate and carbon isotope fractionation of methane. OBJECTIVE:In order to better understand the law of isotope fractionation and methane oxidization in the sediments and to provide reference for further related research in this area,the Bohai Sea sediments were selected as laboratory raw materials for the degradation of laboratory experiments and are described in this paper. METHODS:Gas Chromatography and Gas Chromatography-Isotope Ratio Mass Spectrometry were used to determine the methane oxidation rate,and the carbon isotope fractionation coefficient εof methane was determined. RESULTS:The results show that the aerobic oxidation of methane is dominant.Oxidation temperature and gas flow rate are the main factors affecting the rate of methane oxidation.In the mode of continuous incubation,when the temperature reduced from 28℃ to 15℃,the average oxidation rate reduced by 60% ±10%,indicating that the lower temperature is not helpful for methane oxidation.When the gas flow rate increases from 50 to 150 μL/min,the average oxidation rate of methane increases by 90%±10%.This indicates that the higher gas flow rate is favorable to the increase of oxidation rate.It is also found that the fractionation effect of carbon and hydrogen isotopes are mainly affected by temperature where the fractionation degree is positively correlated with temperature. CONCLUSIONS:Temperature is an important factor affecting methane oxidation rate and isotopic fractionation.关键词
渤海沉积物/甲烷氧化速率/同位素分馏/生物降解/气相色谱法/气相色谱-同位素比值质谱法Key words
Bohai sediments/oxidation rate of methane/isotope fractionation/biodegradation/Gas Chromatography/Gas Chromatography-Isotope Ratio Mass Spectrometry分类
化学化工引用本文复制引用
陈宇峰,郑秀丽,李晶,贺行良,刘昌岭,孟庆国,秦德谛,张培玉..渤海沉积物中甲烷氧化速率及同位素分馏规律研究[J].岩矿测试,2018,37(2):164-174,11.基金项目
中国地质调查局地质调查项目"天然气水合物测试技术与模拟实验"(DD20160216) （DD20160216）
国家自然科学基金资助项目(41406076) （41406076）
