<正>研究了腐殖质对重金属Cu2+和Pb2+的吸附特性。结果表明：腐殖质对Cu2+、Pb2+均具有较强的吸附性能，但存在着明显的差异，腐殖质对Pb2+的吸附能力远远大于Cu2+腐殖质对Cu2+的吸附用Langmuir方程拟合效果优于用Freundlich方程拟合效果，而两个方程对Pb2+吸附的拟合程度都较好。用Langmuir吸附等温式推测腐殖质对Cu2+、Pb2+的饱和吸附量，分别为13.09mg/g和84.15mg/g，腐殖质对Pb2+的饱和吸附量几乎是Cu2+的6.4倍。pH对吸附的影响很大，pH较高时腐殖质具有较大的吸附量。通过IR光谱分析表明，羧基和羟基与重金属离子的络合引起腐殖质对Cu2+和Pb2+的吸附。

Modification and preparation of Polyvinyl Acetate(PVAc) as mainly used as adhesive were very important. Urea was added in emulsion-polymerization of Vinvl Acetate (VAc) and N-Hydroxymethyl Acrylamide(NMA), and performances of the emulsion modified before and after were investigated. Results showed that water-resistance, bonding and solid content of PVAc-NMA-Urea were successfully improved. When the mass rate of urea to VAc was 1%～2%, average wet bond strength was 2.04 times than that of PVAc, and average solid content was also 17.85% higher than that of PVAc.