Kvittingen Lise, Sjursnes Birte Johanne
Department of Chemistry, NTNU, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Faculty of Engineering, Østfold University College, 1757 Halden, Norway.
J Chem Educ. 2020 Aug 11;97(8):2196-2202. doi: 10.1021/acs.jchemed.9b00763. Epub 2020 Jun 30.
An easily constructed and inexpensive polarimeter with an optical rotation angle resolution of about 0.5° is presented. It is made from small pieces of polarizing film, 2 LEDs, a protractor, and a few wires, all held in place with plastic interlocking toy bricks, such as Lego bricks. The instrument was used to demonstrate the optical rotation of plane polarized light as a function of concentration, path length, temperature, and wavelength, and to determine enantiomeric excess in solutions of arabinose, the amount of limonene in citrus ski wax remover, and optical rotations of various types of honeys and essential oils. Results were comparable to values obtained on a commercial scientific instrument, and with literature values.
本文介绍了一种易于构建且成本低廉的旋光仪，其旋光角分辨率约为0.5°。它由小块偏光膜、2个发光二极管、一个量角器和几根电线制成，所有部件都用塑料联锁玩具积木（如乐高积木）固定到位。该仪器用于演示平面偏振光的旋光随浓度、光程长度、温度和波长的变化，并测定阿拉伯糖溶液中的对映体过量、柑橘滑雪蜡去除剂中的柠檬烯含量以及各种蜂蜜和精油的旋光度。结果与在商业科学仪器上获得的值以及文献值相当。
