One lignin unit was found to be oxidized by about 3 electrons as an average when Kappa number of the pulp became about half (from 25.4 to 13.4).

• 只有第一阶段氧化反应是木质素与氧气直接反应，而在第二、三阶段主要是协同氧化作用，氧化反应过程中产生的活性氧基团扮演了一定角色。