In the case of substances known to undergo racemization or mutarotation , care should be taken to standardize the time between adding the solute to the solvent and introduction of the solution into the polarimeter tube .

对于检测已知具有外消旋或变旋作用的物质，应当小心地采取措施对向溶剂中加入溶质和将溶液加入旋光计管道的间隔时间进行标准化。