我国的试剂规格基本上按纯度（杂质含量的多少）划分，共有 高纯、光谱纯、基准、分光纯、优级纯、分析和化学纯 等 7 种。国家和主管部门颁布质量指...

PASW Statistics 18 (formerly SPSS Statistics) puts the power of advanced statistical analysis in your hands. Whether you are a beginner or an experienced statistician, its comprehensive set of tools w...

ChemOffice by CambridgeSoft The industry standard scientific research desktop software suite designed for chemists in the lab and in the classroom. ChemOffice Ultra is the premier scientific software...

1. Prepare the developing container. The developing container for TLC can be a specially designed chamber, a jar with a lid, or a beaker with a watch glass on the top: In the teaching labs, we use a b...

The retention factor, or R f , is defined as the distance traveled by the compound divided by the distance traveled by the solvent. For example, if a compound travels 2.1 cm and the solvent front trav...

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1.在工作区内禁止饮食，吸烟和存放食物及使用化妆品。 2.实验室里应保持整洁，不存放与工作无关的杂物。 3.工作台每天至少用消毒剂清洁一次，在溢渗...

高速逆流色谱 （ high-speed countercurrent chromatography ， HSCCC ）是 20 世纪 80 年代发展起来的一种连续高效的液液分配色谱分离技术， 它不用任何固态的支撑物...