资料摘要
资料下载The isotope ratio of each of the light elements preserves individual information on the origin and history of organic natural compounds. Therefore, a multi-element isotope ratio analysis is the mostefficient means for the origin and authenticity assignment of food, and also for the solution of various problems in ecology, archaeology and criminology. Due to the extraordinary relative abundances of the elements hydrogen, carbon, nitrogen and sulfur in some biological material and to the need for individual sample preparations for H and S, their isotope ratio determination currently requires at least three independent procedures and approximately 1 h of work. We present here a system for the integrated elemental and isotope ratio analysis of all four elements in one sample within 20 min. The system consists of an elemental analyser coupled to an isotope ratio mass spectrometer with an inlet system for four reference gases (N2, CO2, H2 and SO2). The combustion gases are separated by reversible adsorption and determined by a thermoconductivity detector; H2O is reduced to H2. The analyser is able to combust samples with up to 100mg of organic material, sufficient to analyse samples with even unusual elemental ratios, in one run. A comparison of the isotope ratios of samples of water, fruit juices, cheese and ethanol from wine, analysed by the four-element analyser and by classical methods and systems, respectively, yielded excellent agreements. The sensitivity of the device for the isotope ratio measurement of C andNcorresponds to that of other systems. It is less by a factor of four forHand by a factor of two for S, and the error ranges are identical to those of other systems.
微库仑法测定废水中的可吸附有机卤素(AOX)和纸浆中的总有机卤素(TOX)
简介:纸浆和纸品工艺过程中用到高浓度的化学物,如氯,二氧化氯和盐酸用来漂白,由此产生的废水包含有机氯化物,这些物质对环境有害,因此废水中可吸附有机卤素AOX和纸浆中的总有机卤素TOX显得尤为重要。
应用指南第一篇:从等温吸附线中可以获得什么信息?
简介:比表面和孔径测量: Microtrac MRB采用气体吸附法为粉体样品的比表面值,BET值和孔径测量提供了吸附系列的分析仪器。开发和生产以及装配地点位于日本大阪的表面分析中心。 我们为客户提供先进的技术,以不断获得可靠的结果。创新和质量是我们成功的基础。
应用指南3:通过BET方法分析活性炭的比表面积(I型等温吸脱附曲线)
简介:比表面和孔径测量: Microtrac MRB采用气体吸附法为粉体样品的比表面值,BET值和孔径测量提供了吸附系列的分析仪器。开发和生产以及装配地点位于日本大阪的表面分析中心。 我们为客户提供先进的技术,以不断获得可靠的结果。创新和质量是我们成功的基础。
R1_No.2_ENG_TheevaluationoftheSpecificsurfaceareaofporousSilicabyBETmethod
简介:比表面和孔径测量: Microtrac MRB采用气体吸附法为粉体样品的比表面值,BET值和孔径测量提供了吸附系列的分析仪器。开发和生产以及装配地点位于日本大阪的表面分析中心。 我们为客户提供先进的技术,以不断获得可靠的结果。创新和质量是我们成功的基础。
R1_No.3_ENG_TheevaluationoftheSpecificsurfaceareaofactivecarbon(TypeIadsorptionisotherm)byBETmethod
简介:比表面和孔径测量: Microtrac MRB采用气体吸附法为粉体样品的比表面值,BET值和孔径测量提供了吸附系列的分析仪器。开发和生产以及装配地点位于日本大阪的表面分析中心。 我们为客户提供先进的技术,以不断获得可靠的结果。创新和质量是我们成功的基础。
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