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Decomposition of algal lipids in clay-enriched marine sediment under oxic and anoxic conditions 总被引：1，自引：1，他引：0
A series of laboratory incubation experiments were conducted to examine the decomposition of algal organic matter in clay-enriched
marine sediment under oxic and anoxic conditions. During the 245-day incubation period, changes in the concentrations of TOC,
major algal fatty acid components (14:0, 16:0, 16:1, 18:1 and 20:5), and n-alkanes (C16–C23) were quantified in the samples. Our results indicate that the organic matters were degraded more rapidly in oxic than anoxic
conditions. Adsorption of fatty acids onto clay minerals was a rapid and reversible process. Using a simple G model, we calculated
the decomposition rate constants for TOC, n-alkanes and fatty acids which ranged from 0.017–0.024 d−1, 0.049–0.103 d−1 and 0.011 to 0.069 d−1, respectively. Algal organic matter degraded in two stages characterized by a fast and a slow degradation processes. The
addition of clay minerals montmorillonite and kaolinite to the sediments showed significant influence affecting the decomposition
processes of algal TOC and fatty acids by adsorption and incorporation of the compounds with clay particles. Adsorption/association
of fatty acids by clay minerals was rapid but appeared to be a slow reversible process. In addition to the sediment redox
and clay influence, the structure of the compounds also played important roles in affecting their degradation dynamic in sediments. 相似文献
2.
A series of laboratory incubation experiments were conducted to examine the decomposition of algal organic matter in clay-enriched marine sediment under oxic and anoxic conditions.During the 245-day incubation period,changes in the concentrations of TOC,major algal fatty acid components (14:0,16:0,16:1,18:1 and 20:5),and n-alkanes (C16-C23) were quantified in the samples.Our results indicate that the organic matters were degraded more rapidly in oxic than anoxic conditions.Adsorption of fatty acids onto cla... 相似文献
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大型海藻孔石莼在工厂化海水养殖中的生物修复及其应用前景 总被引：1，自引：0，他引：1
海水养殖业是山东半岛蓝色经济区建设产业群的重要组成部分.在大力发展蓝色经济的宏观指导下,海水养殖业特别是工厂化海水养殖业得以快速发展.近几年,除了较早发展的室内鲍鱼养殖外,我国许多海水养殖品种和养殖规模都有所扩大,如真鲷、牙鲆、美国红鱼、大西洋鲑等.在以低碳养殖(低能耗、低排放、低污染)为产业发展方向的政策指引下,一种对环境友好、对生物无害、可高值化利用的养殖模式——海基(生态型)和陆基(集约型)两大类型的工厂化养殖模式成为养殖业发展的方向.大型藻类由于生长速度快,海水净化能力强,用其在水产养殖过程中替代化学和微生物方法净化水质,维持养殖生态平衡,取得了良好的效果. 相似文献
4.
Selected trace metals(Pb, Cd, Cu, Hg) and arsenic in seawater and surface sediments of Laizhou Bay were determined, to evaluate their spatial distribution, pollution risk and potential ecological risk. Concentrations of the elements were 0.56–2.07, 0.14–0.38, 12.70–18.40, 0.014–0.094, and 1.13–2.37 μg/L in the seawater and 8.94–32.2, 0.18–0.67, 4.51–30.5, 0.006–0.058, and 5.75–15.3 mg/kg in sediments for Pb, Cd, Cu, Hg and As, respectively. High concentrations of the trace metals and arsenic in seawater and surface sediments were generally observed near the river estuary. The pollution risk result of the elements showed that Cu was the prominent trace metal pollutant in seawater, followed by Hg, Pb, Cd and As. The metal complex pollution index in seawater was at a medium level. The most important trace metal pollutant in sediments was Cd, followed by As, Cu, Pb, and Hg. Our pollution assessment suggests that trace metal pollution in Laizhou Bay sediments was at a low level. The potential ecological risk was also low in surface sediment. 相似文献
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采用大体积现场泵方法同时采集不同粒级的^228Th、^234Th及溶解态的^228Th、^234Th、^228Ra．以小体积MnO2共沉淀-β计数法测定海水中的总^234Th活度（A＇TTh）；用Goflo采水器采集6～10dm^3海水，继而过滤收集颗粒物质并测定其^234Th的活度（A’PTh）；以α能谱测定分离纯化后的^228Th；对^228Ra则是采用测定其子体^228Ac的β放射性方法．采用此流程分析了南海2004年2月航次A1站住的样品，获得了较好的结果． 相似文献
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以小球藻(Chlorela sp.)和三角褐指藻(Phaeodactylum tricornutum)为研究对象,比较了其合成有机物中长链烷烃和脂肪酸的组成和丰度.结果表明,小球藻中的脂肪酸以14:0、16:1、16:0、20:5为主,其中16:0饱和脂肪酸的质量分数为43%,具绝对优势.三角褐指藻中的脂肪酸组成显示16:1、16:0、20:5占优势.其中16:1和16:0两种脂肪酸含量相当.长链烷烃在两种藻中均以低碳链分布,优势组分集中在C16～C21碳链之间.小球藻中C17具有明显丰度,而三角褐指藻中长链烷烃含量差别不大.两种微藻中的长链烷烃组成都没有奇偶优势碳链分布的特征,这与陆源植物中长链烷烃明显的奇偶优势分布特征相比,具有显著的差异.这些结果对判断不同微藻在食物链中的营养级别,以及对以长链烷烃和脂肪酸为生物标志物研究我国近岸海沉积物中有机物的来源均具有实际意义. 相似文献
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