测定水溶性酚醛树脂胶粘剂中游离甲醛含量方法的改进.docx

第 25 卷 第 3 期2013 年 7 月常州大学学报 ( 自然科学版)Journal of Changzhou University ( Natural Science Edition)Vol. 25 No. 3Jul. 2013文章编号:2095 － 0411 ( 2013)03- 0084- 04测定水溶性酚醛树脂胶粘剂中游离甲醛 *含量方法的改进 巫淼鑫，方圆圆，杜郢，周太炎( 常州大学 测试中心，江苏 常州 213164)摘要: 改进了乙酰丙酮分光光度法测定水溶性酚醛树脂胶粘剂中游离甲醛含量的方法。研究了方法的影响因素，确定了测定条件。本方法采用添加乙酸- 乙酸铵缓冲溶液后，过滤来制备试样液。排除了树脂和样品颜色的干扰。与传统的蒸馏法相比，回 收率高，操作方便。回收率可达 97. 7% ～ 99. 3% 。而蒸馏法的回收率是 91. 1% 。方法的相对标准偏差小于 2. 1% 。研究发现含 缓冲溶液的标准溶液和试样液，在室温下稳定。不必现配现用或储存在冰箱中。2 000 倍苯酚对甲醛测定不产生干扰。与 化 学 滴定法相比，检测限低，试剂用量少。在测定低含量的甲醛时准确度高。适合于水溶性酚醛树脂中游离甲醛含量的测定。 关键词: 水溶性; 酚醛树脂; 游离甲醛; 乙酰丙酮; 分光光度法中图分类号: TQ 430. 71文献标识码: Adoi: 10. 3969 / j. issn. 2095 － 0411. 2013. 03. 021Improved Analytical Method for Free Formaldehyde in Adhesive ofWater-Soluble Phenol-Formaldehyde ResinWU Miao-xin，FANG Yuan-yuan，DU Ying，ZHOU Tai-yan( Analysis Center，Changzhou University，Changzhou 213164，China)Abstract: An improved analytical method ( acetylacetone spectrophotometry) for the determination of free formal-dehyde in adhesive of water-soluble phenol-formaldehyde resin was established． The influencing factors were stud- ied and the testing conditions were determined． The sample solutions used in this method were prepared by adding buffer solution of acetic acid-ammonium acetate and filtrating． The interferences from resin and sample color were eliminated． Good recoveries from 97. 7% to 99. 3% were obtained． They were higher than the ones obtained by traditional straight-run distillation process，which were 91. 1% ． The relative standard deviations obtained by this method were lower than 2. 1% ． This research discovered that the sample solution and the formaldehyde standard solution were stable when the buffer solution was added． The formaldehyde determination with this analytical meth- od wasnt disturbed by the phenol when its concentration was 2 000 times as high as the formaldehyde． Compared with chemical titrimetric methods，this analytical method has many advantages such as low detection limit，reagent and s