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...

量程的调节 调节量程时，如果要从大体积调为小体积，则按照正常的调节方法，逆时针旋转旋钮即可；但如果要从小体积调为大体积时，则可先顺时针旋...

新购树脂可能含有分散剂、致孔剂、惰性溶剂等化学残留，所以使用前应按以下步骤进行预处理。 1、装柱前清洗吸附柱与管道，并排净设备内的水，以防...