<正>以元素分析、凝胶色谱、红外光谱（ＦＴＩＲ）、紫外光谱（ＵＶ）等方法对ＣａＬｓ、ＣＡ、ＳＦＰ三种木质素磺酸盐氧化氨解前后的化学结构进行了研究，并提出了可能的反应机理。结果表明，产品分子量降低，芳环结构部分降解，而氮含量明显升高，碳氮比降低，其中以ＳＦＰ氮含量增加最多。氮主要是以胺、酰胺、环键合氮等形式存在。

The structure of three kinds of ammoxidative lignosulfonate was studied by elementary analysis、GPC、FTIR　and UV et al.. The proper reaction mechanism based on investigation was provided. Results indicated that:molecular weights of products decreased; aromatic structure degraded partly; nitrogen contents increased and C／N ratio decreased. Among three lignins (CaLs、SEP and CA），the nitrogen content of SFP increased, most N mainly exits in amine、amide and cyclic bonded nitrogen et al.