1·It is explained that I append a thermostatic water-jacket to the polarimeter.
因陋就简地为旋光仪加装恒温水套,避免了温度对实验的影响。
2·Improved the method of purification, the structure of lactide was characterized by the melting point, IR, UV, Digital Automatic Polarimeter and HPLC.
改进了提纯L -丙交酯的方法,采用熔点、红外光谱、紫外光谱、数字自动旋光仪及高效液相色谱对提纯后的L -丙交酯进行了表征。