当某一有机化合物发生取代反应时,经常生成一取代、二取代、甚至多取代衍生物的混合物。在这种情况下,要测定混合物中某一组分的含量时,往往受到其它组分的干扰。通常需要采用适当的分离手段,如萃取、色层等方法,将欲测组分分出后才能进行测定。当各 When an organic compound undergoes a substitution reaction, a mixture of mono-, di-, and even multi-substituted derivatives is often produced. In this case, to determine the content of a component in a mixture, it is often disturbed by other components. Usually need to use the appropriate separation means, such as extraction, chromatography and other methods, the components to be measured before the separation can be measured. When all