Bacteria sulfate reduction is a major pathway for organic carbon oxidation in marine sediments. Upward diffusion of methane from gas hydrate deep in the sedimentary strata might be another important source of carbon for sulfate reducing bacteria and subsequently induce higher rates of sulfate reduction in sediments. Since abundant gas may migrate upward to the surface as a result of tectonic activity occurring in the accretionary wedge, this study investigates the effect of methane migration on the sulfate reduction process in continental margin sediments offshore southwestern Taiwan. Piston and gravity core samples were taken in order to evaluate vertical and spatial variations of sulfate and methane. Pore water sulfate,sulfide, methane, sediment pyrite, and organic carbon were extracted and analyzed.

The catalytic properties of a series of cobalt complexes containing bidenated nitrogen ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of different reaction time, temperature and cobalt complexes containing different ligand on catalyst performance has been investigated.

Cyclopalladated complexes of tertiary arylamines are reported in this paper as highly efficient catalysts for the Heck reactions of iodoarenes with methylacrylate. The monomeric complexes (2 and 4), which contain mixed phosphorous–nitrogen (P–N) donors, were found to be more active than the corresponding dimeric ones, which contain only single nitrogen donor. Palladium mirror was observed, indicating the involvement of classic Pd(0)/Pd(II) catalytic cycle using these cyclopalladated complexes.

以水玻璃为硅源,以偏铝酸钠为铝源,以十六烷基三甲基溴化铵(CTAB) 为模板剂,合成了强酸性介孔分子筛Al2MSU2S及介孔2微孔分子筛Al2MSU2S. 采用XRD ,N2 物理吸附,MAS NMR ,FT2IR , GC2MS , TG, TPD ,SEM 和TEM 等手段,对Al2MSU2S 分子筛的结构、组成、酸性质和形貌等进行了表征. 考察了反应温度和压力对Al2MSU2S 分子筛催化剂上二异丙苯裂化反应的影响,并就Al2MSU2S 分子筛的酸性和孔结构在反应中的作用进行了探讨.

The catalytic properties of a series of cobalt complexes containing monodentate phosphorus, bidentate phosphorus, bidentate nitrogen ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of reaction time, temperature and different ligands on catalyst performance has been investigated. The kinetics of the reaction of tri-isobutylaluminum with ethylene catalyzed by zerovalent cobalt complex has been studied. The displacement reaction rate shows first-order dependence with respect to trialkylaluminum concentration, cobalt complex concentration and ethylene pressure, respectively. The kinetics equation of displacement reaction rate is r = 1.4×106 [R3Al][Cat][PC2H4 ]. The activation energy for this reaction is Ea = 71.9 kJ/mol.

A marine green alga, Platymonas subcordiformis, was demonstrated to photobiologically evolve hydrogen (H2) after the first stage of photosynthesis, when subjected to a two-phase incubation protocol in a second stage of H2 production: anaerobic incubation in the dark followed by the exposure to light illumination. The anaerobic incubation induced hydrogenase activity to catalyse H2 evolution in the following phase of light illumination. H2 evolution strongly depended upon the duration of anaerobic incubation, deprivation of sulphur (S) from the medium and the medium pH. An optimal anaerobic incubation period of 32 h gave the maximum H2 evolution in the second phase in the absence of sulphur. Evolution of H2 was greatly enhanced by 13 times when S was deprived from the medium. This result suggests that S plays a critical role in the mediation of H2 evolution from P. subcordiformis. A 14-fold increase in H2 production was obtained when the medium pH increased from 5 to 8; with a sharp decline at pH above eight. H2 evolution was enhanced by 30–50% when supplementing the optimal concentrations of 25mM acetate and 37.5mM glucose.

Differential steam-reforming rates were measured for methane, ethane, n-butane, n-hexane, 2,4-dimethylhexane, n-octane, cyclohexane, benzene, and toluene over 1 wt.% Pd/ceria between 620 and 770K and were compared to rates observed on 1 wt.% Pd/alumina and 1 wt.% Pt/ceria. The H2O:C ratios at which stable rates were observed on Pd/ceria depended on the hydrocarbon, varying from less than 1:1 for methane to 3:1 for 2,4-dimethylhexane. In the series of alkanes from methane to n-hexane, for a H2O:C ratio of 2:1, the only products were CO, CO2, and H2O and the rate of formation of CO2 and CO increased with carbon number. Benzene was also selectively converted to COx and H2, but at lower rates than the alkanes with the exception of methane. For 2,4-dimethylhexane and n-octane, a significant amount of cyclohexane was observed in the initial products and cyclohexane was selectively converted to benzene at low conversions. Steam reforming of toluene also gave benzene as the initial product. FTIR measurements of Pd/ceria under methane-steam-reforming conditions indicate the formation of carbonates on the ceria. Pd/alumina showed significantly lower rates than Pd/ceria and much lower CO2:CO ratios in the initial products, implying ceria plays an important role in the reaction. Pt/ceria gave rates and selectivities that were essentially identical to that of Pd/ceria. The implications of these results for hydrocarbon fuel processing are discussed. © 2002 Elsevier Science B.V. All rights reserved.

The diffusive transport of volatile organic compounds (VOCs) in the subsurface at petroleum spill sites can significantly affect vapor migration from sources to buildings and ground surface. Thus, knowledge of compound-specific vapor transport and bio-attenuation is of great interests to those who must identify risks and make corrective action decisions for petroleum spill sites. In this work, the vapor transport of individual compounds in complex petroleum vapor mixtures is being studied for idealized lithologies in 2-m (6-ft) tall laboratory soil columns. Six columns, representing different geological settings were prepared using 40-60 mesh sand (medium grained) and 16-minus mesh crushed granite (fine-grained). The contaminant vapor source is composed by twelve petroleum hydrocarbons that typify weathered gasoline. The liquid hydrocarbon mixture is placed in a chamber at the bottom of each column, and the vapors are allowed to diffuse upward through the soil to a chamber at the top of the columns, which is swept with humidified gas. The contaminant source vapor concentration is maintained constant throughout the experimental period by periodic replacement of the liquid. The experiment is conducted for two cases: i) anaerobic conditions, in which the sweep gas at the top of the column is nitrogen and no biodegradation is expected to occur; and ii) aerobic conditions; in which, air is the sweep gas; this phase will performed in the near future. Soil diffusion coefficients, and oxygen, carbon dioxide and hydrocarbon vapor concentration of each chemical are monitored over time in the column and the effluent sweep gas. The data allow determination of compound-specific flux and times for steady profiles to be achieved. The anaerobic phase of the experiment is ongoing. Results show that vapor transport is highly influenced by the chemical and physical properties of the chemicals, soil moisture, soil effective diffusion coefficients and geological settings.

Water-gas-shift (WGS) reaction rates have been measured on Pd/ceria, Ni/ceria, Fe/ceria, Co/ceria, ceria, and Pd/silica.Pd/ceria exhibited much higher activities than either ceria alone or Pd/silica, demonstrating a cooperative effect between Pd and ceria. Pd/ceria and Ni/ceria showed essentially the same activities and were much more active than either Co/ceria or Fe/ceria. Reaction orders on Pd/ceria were approximately zeroth-order in CO, half-order in H2O, inverse-half-order in CO2 and inverse-first-order in H2. Diffuse reflectance, FTIR measurements on Pd/ceria indicate the ceria exists in a reduced state under WGS conditions and is covered by carbonate species that are removed only by reoxidation of ceria. The implications of these results for improved WGS catalysis are discussed. © 2001 Elsevier Science B.V. All rights reserved.

研究乙烯对混合烷基铝(C2226 ) 中烷基的置换反应的分析方法。采用水解反应产物,准确测量产生气体的体积,用气相色谱法分析其中乙烷的含量,用化学法测定水解产物水相中的铝含量。计算出置换反应的转化率为82. 89 % ,反应速率为0. 4502 mol (C2H5 )Pmol (Al)Psec 。建立的方法简便、快速、精密度良好,可应用于其他有机铝化合物的置换反应。

目的：建立用车载式气相(色谱仪)现场快速检测9种有机磷农药残留的分析方法。方法：采用改进的QuECh-ERS前处理方法、SRI 8610C车载式气相色谱仪(选用DB一1701毛细管柱、FPD检测器)对9种农药残留进行检测。结果：浓度在0．1～2．0 g／ml范围的标准曲线，其线性相关系数在0．9959～0．9991之间，样品加标回收率为8O．O％ ～108．O％ ．RSD为2．35％ ～11．78％ ，最低检出限为0．052～0．114 mg／kg。结论：本方法简便、快速、安全，可用于果蔬样品农药残留的现场检测。

目的：建立用车载式气相(色谱仪)现场快速检测9种有机磷农药残留的分析方法。方法：采用改进的QuECh-ERS前处理方法、SRI 8610C车载式气相色谱仪(选用DB一1701毛细管柱、FPD检测器)对9种农药残留进行检测。结果：浓度在0．1～2．0 g／ml范围的标准曲线，其线性相关系数在0．9959～0．9991之间，样品加标回收率为8O．O％ ～108．O％ ．RSD为2．35％ ～11．78％ ，最低检出限为0．052～0．114 mg／kg。结论：本方法简便、快速、安全，可用于果蔬样品农药残留的现场检测。

研究乙烯对混合烷基铝(C2226 ) 中烷基的置换反应的分析方法。采用水解反应产物,准确测量产生气体的体积,用气相色谱法分析其中乙烷的含量,用化学法测定水解产物水相中的铝含量。计算出置换反应的转化率为82. 89 % ,反应速率为0. 4502 mol (C2H5 )Pmol (Al)Psec 。建立的方法简便、快速、精密度良好,可应用于其他有机铝化合物的置换反应。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用甘油三脂物质的检测。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用于糖和糖醇类物质的检测。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用于固醇类物质的检测。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用于食品污染物的检测。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用于调味品和香料的检验。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用于脂肪酸的分离和检测。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够分离较难分离的同分异构体，如脂肪酸甲酯。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的DPS气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，且升级和维修简单方便。能够用于产品中香精油品质和含量方面的检测。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。近些年来，食品中不同手性异构体比例的检测受到广泛的重视，DPS手性检测仪专为分离并检测手性化合物而设计，高度灵敏的FID检测器可以胜任此项艰巨的工作。

DPS气相色谱仪已广泛应用于环境，食品，法医鉴定，个人保健，石油，制药及溶剂化学品等领域中。高度集成的气相色谱分析仪体积小，重量轻，模块化设计，具有较大的自由扩展空间，系统升级和维修均简单方便。能够用于酒精方面的检测。

Distilled spirits, wine, and beer all contain flavoring agents, esters, acids, and aldehydes. While the ethanol content is closely monitored and regulated by government agencies, the unique flavor of each spirit is the combination of the individual compounds. While other methods can determine the ethanol content, only Chromatography can messure the ethanol and separate the individual constituents for identification. When you want to know what makes your favorite bourbon, rum, or whiskey tastes so special you need a DPS Alcohol & Spirites GC System. The latest designed high resolution columns and the sensitive FID detector does the hard work for you. The fast heating and rapid cooling column oven in every DPS GC vastly increases your sample throughput. Adding a 110 vial Autosampler can increase your profits by running the system around the clock. The fully intergrated Alcohol & Spirits GC Analyzer System is small and lightweight and all DPS systems are modular for expandability, upgrades, and easy service.

当需要检测低浓度的气体时，推荐您使用DPS公司生产的高灵敏度气体分析仪。美国DPS气相色谱仪可根据您的分析要求，通过调整检测器灵敏度的动态范围，以满足从超低浓度的气体分析到常量气体分析。为了给您的分析提供便利，可在DPS气相色谱系统内配置空气压缩机、电动真空泵、电磁阀，电子进样阀，浓缩捕集管等。由于它的轻巧、整体性和自动气体分析系统等特点，可放置在实验室的任何角落，整个配置包括检测碳氢化合物的FID检测器、检测芳烃的PID检测器和检测氯化物的BCD检测器。所有的DPS气相色谱仪都是模块化系统，便于扩展、升级以及方便维护。保护您自己和您的家人免受毒气侵害！让我们所有人都行动起来，保护环境。

This application notes figures out as a first approach on how cyclic electron flow can be followed using JTS-10 (Joliot Type Spectrometer) on a spinach leave, in absorbance mode.

JTS-10 has the capacity to reveal fast oxidation and reduction kinetics through absorbance measurements, in all the visible and Infra Red wavelength ranges, without restrictions. The time resolution of the method can vary from 10μs to several seconds to minutes. The aim of this note is to show how a cyclic vs linear electron flow can be easily revealed using JTS-10. Examples can be found in the literature following the same method.

This application note aims to show how a JTS-10 can be used to follow fluorescence changes in a leaf, to study in-vivo photosynthetic processes.

Good graphical representation makes easier the understanding of the data. That''s why EC-Lab® and EC-Lab® Express software provide a traces processing tool (Fig. 1) which allows the user to customize its own traces. 24 mathematical functions (Fig. 2) are available (button “more” of the calculator) for writing mathematical expression of X-, Y1- or Y2-axis. In this application note, some examples of graphic customization are shown in various field of electrochemistry.

In this note, only the pitting corrosion in presence of chloride is investigated. For this purpose, Linear Polarization (LP) and Multielectrode Potentiodynamic Pitting (MPP) are performed.