摘要： 建立了测定防水涂料乳液中氨含量的凯氏定氮仪蒸馏滴定法。 称取 2 g 样品，经凯氏定氮仪碱化蒸馏，以硼酸为接收液，用 0.01 mol/ L 的盐酸标准溶液进行滴定。 该方法加标回收率为91.3%~96.6%，测定结果的相对标准偏差小于3.0%。 与JC1066—2008附录C中方法测定结果无显著性差异，凯氏定氮仪蒸馏滴定法的准确度、精密度均优于标准方法 JC 1066—2008 附录 C，而且耗时短，方法可靠，满足涂料及涂料乳液厂商实施原材料及产品监控需要。

关键词: 防水涂料, 乳液, 氨含量, 凯氏定氮仪

Abstract: The Kjeldahl analysis method for determination of ammonia in the latex for water-resistant coatings has been established. 2 g sample was alkali-distilled via the Kieldahl Azotometer. Boric acid was used as receiving solution, and 0. 01 moL/L hydrochloric acid was used as the standard solution for automatic titration. The recovery of the method was in the range of 91. 3%~96. 6%, the relative standard deviation was less than 3. 0%. Compared with the appendix C of JC 1066-2008 method, the results detected by this method had no significant difference. The Kieldahl Azotometer method showed better accuracy and precision than the appendix C of JC 1066-2008 method, moreover, it was a reliable method which consumed less time, and met the demand on monitoring of raw materials and products.

Key words: water-resistant coatings, emulsion, ammonia, Kieldahl Azotometer