In the petroleum refining and petrochemical industries, the initialism BTX refers to mixtures of benzene, toluene, and the three xylene isomers, all of which are aromatic hydrocarbons. The xylene isomers are distinguished by the designations ortho- (or o -), meta - (or m -), and para - (or p -) as indicated in the adjacent diagram.

2016年6月22日 · Often, people choose to measure a group of VOCs, collectively known as BTEX, comprising benzene, toluene, ethylbenzene and xylene (often expressed as total xylenes (m+p). The BTEX suite has grown in popularity, as they are straightforward to monitor together, and provide a well-rounded picture of VOCs and are present in most urban areas.

2010年12月31日 · This test method was primarily developed to determine benzene, toluene, and xylenes in chemical intermediate and solvent streams such as reformate, BTX extracts, pyrolysis gasoline, hydrogenated pyrolysis gasoline, crude benzene, crude ethylbenzene, commercial toluene, and light blending aromatic feedstocks.

2025年3月25日 · 1.1 本试验方法适用于毛细管柱气相色谱法测定BTX浓缩液中总非芳香烃、苯、甲苯、乙苯、二甲苯和总C9+芳香烃。 本试验方法适用于终沸点低于215℃的物料。 1.2 本测试方法也可用于确定混合二甲苯中各个 C8 芳烃异构体的相对分布。 1.3 单个成分可测定范围为0.01至908201；%。 1.4 在确定使用本方法的测试结果与适用规范的一致性时，结果应根据实践 E29 的四舍五入方法进行四舍五入。 1.5 以 SI 单位表示的值应被视为标准值。 本标准不包含其他计 …

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Designation: D 6563 – 00 Test Method for Benzene, Toluene, Xylene, (BTX) Concentrates Analysis by Capillary Column Gas Chromatography 1 This s..

We present an easy clinical antibody test based on a test injection of BTX A into an indicator muscle, the extensor digitorum brevis (EDB), combined with amplitude measurements of compound muscle action potentials (CMAPs) elicited by electrical nerve stimulation of the peroneal nerve before and after the injection.

Measuring BTX or Total Aromatics. The OMA system uses a multi-component analysis algorithm which harvests the rich data of dispersive UV spectrophotometry in order to easily measure multiple analytes with overlapping absorbance curves.

bTeX 是一个类似 LaTeX 的排版语言，它将 LaTeX 格式的源代码转换为 HTML。 进行以下步骤： 运行 yarn 初始化项目文件夹。 运行 yarn build 编译项目。 运行 yarn start 或 node ./dist/main.js 启动本地服务器。 若要使用 TikZ，于端口 9292 运行 tikz2svg。 bTeX 将运行于本地端口 7200。 向该端口发送 POST 请求以运行编译器，格式如下： "code": "要编译的代码" . 可选参数： "preamble": string，导言部分。 "inverseSearch": boolean，指定是否包含反向搜索信息，默认 …

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