Environmental behavior of organotin compounds in the coastal environment of Xiamen, China

In 2006, organotins pollution were investigated in the coastal environment of Xiamen, China. Six species of organotin compounds including tributyltin, triphenyltin and their degradation compounds were quantified in the dissolved and particulate phases of the water, and in the sediment using GC-FPD. The concentrations of organotin compounds ranged from 2.2 to 160 ng (Sn) L-1 dissolved in the water, 0.14-6.7 ng (Sn) L-1 in suspended particulate matter and nd similar to 26 ng (Sn) g(-1) (dry weight) in the sediment. The highest concentration of total organotin or tributyltin in water was found in a shipyard and at a station near the inlet of the harbor, indicating fresh inputs of antifouling paints to Xiamen's coastal environment. Organotin speciation was performed on sediment cores to investigate contamination trends over the past ten years in the harbor. The results of Pb-210 dating indicated that Xiamen western harbor suffered contamination during 2000. The environmental behavior of organotins such as the enhancement of the microlayer, partitioning between water/suspended particulate matter and between water/sediment are also discussed in this paper. (c) 2008 Elsevier Ltd. All tights reserved

A FUZZY CLASSIFICATION of STEROLS IN SURFACE SEDIMENTS FROM XIAMEN HARBOR: A PRELIMINARY STUDY of ORGANIC MATTER SOURCE INDICATORS

利用gCMS定性及gCfId定量，测定了1993年11月采自厦门西海域8个站位的表层沉积物样品.应用模糊聚类的方法，结合文献资料，对甾醇的指标作用进行了探讨：利用聚类结果去除少量不合理数据，将甾醇划分为3类（A、b、C），其在海域中的分布各有特点；A类甾醇带有经处理过的污水的特征，表现出从厦门市最大生活污水排污口向四周扩散的过程；b类甾醇含陆源物质和未经处理的污水的特征，与养殖和其他排污口及九龙江输入有关；C类甾醇都是海洋浮游生物可产生的种类，分布较均匀.对站位的聚类分析表明：东北靠近高集海堤及东南近外海两处沉积物甾醇组成相近，污染相对较小；湾内靠西岸一带海域则主要受养殖的影响.Sterol compositions of surFace sediments were studies as organic matter source indicators.With analyzing techniques such as column chromatography, gas chromatography and GC/MS, more than 25 kinds of sterols were detected.The total sterol content in the sediments varied From 12.7 μg/g to 52 9 μg/g.Instead of discussing the sterol distribution pattern directly, a Fuzzy classiFication method was applied to determine how many distribution patterns there exited and which distribution pattern each sterol belonged to.The preliminary results show there were Four distribution patterns.Type A, including one of the sewage indicator epicorprostanol, had a strong relationship to the most important sewage output of the city.Type B, including some higher plant sterols (β sitosterol, stigmasterol) and some other sterols, constituted the main component part of the total sterols and had a bearing on aquaculture because many kinds of bait was made From higher plants.Type C, including some plankton sterol such as 24 Methyl cholesta 5,22 dien 3β ol, had a relatively even distribution to other types and we can interpret it with its marine source.Type D were sterols that had no signiFicant pattern in distribution, Further researches are needed.国家自然科学基

Analysis of fatty acids of phosphotides in marine sediment by GC－MS

应用GC-MS 技术对海洋沉积物中磷脂类化合物的脂肪酸进行了分析, 鉴定出70 种脂肪酸,建立了磷脂类化合物中脂肪酸的GC2MS 测定方法。加标脂肪酸系列化合物回收率为72.18 %～91.15 %。探讨了用磷脂类化合物估价海洋和河口沉积物中微生物生物量的可行性

Analysis of fatty acids of phosphotides in marine sediment by GC-MS.

应用GC MS技术对海洋沉积物中磷脂类化合物的脂肪酸进行了分析 ,鉴定出 70种脂肪酸 ,建立了磷脂类化合物中脂肪酸的GC MS测定方法。加标脂肪酸系列化合物回收率为 72 8%～ 91 5 %。探讨了用磷脂类化合物估价海洋和河口沉积物中微生物生物量的可行性A method has been established for analyzing fatty acids of phosphotides in marine sediment by GC MS and seventy kinds of fatty acids have been identified.The recoveries are 72 8%～97 5% for series compounds of fatty acids added with standards. The feasibility of using phosphotides to evaluate the microbial biomass in marine and estuary sediments was investigated

Quantum Chemical Study of Chemisorption States For Oxygen on Alkali Metal Oxides and SulFides

碱金属氧化物和硫化物晶面上氧吸附态的量子化学研究＠戴玉梅＠林银钟＠陈鸿博＠洪琦＠易军＠陈守正＠廖代伟￥福建师范大学化学系￥厦门大学物理化学研究所￥厦门大学化学系￥固体表面物理化学国家重点实验室碱金属氧化物和硫化物晶面上氧吸附态的量子化学研究戴玉梅1林银钟2...The Chemisorption States For O_2 on (100), (110) and (111) surFaces of Li_2O, Li_2S, Na_2O and Na_2S with the Flat-lying model, inclined model and vertical model are studied by CNDO/2LMO.The calculations indicated that, in energy, the (100) surFace and Flatlying model are the most Favorable while the chemisorbed O_2 is excitation state.The results also showed that the decrease in cation radius is in Favor of both chemisorption and activation of oxygen.国家自然科学基金;福建炼油厂资

GaAs/GaP界面的X射线掠入射衍射分析

用掠入射全反射X射线衍射,结合常规X射线衍射,对GaAs/GaP应变层界面进行了研究,给出了界面失配度、薄膜晶胞的畸变和界面弛豫等结构参数。结果表明掠入射衍射(GID)是测定半导体薄外延膜界面结构的有效工具