摘要
在质量浓度为95%的乙醇溶液中,以适当浓度的HC l溶液为滴定剂,分别对系列苯胺标准溶液滴定至选定的pH值,绘制HC l溶液消耗体积与苯胺含量的标准曲线,由该曲线求出未知样中苯胺的含量。结果表明,该方法测量的准确性高,相对误差≤1.2%,相对平均偏差为0.2%,二苯胺的存在对苯胺的测定不产生影响。与现用方法相比,该法不需要进行苯胺与二苯胺的分离,也无需对滴定剂进行标定;该法可用于工业上二苯胺中苯胺含量的测定。
With the help of the addition of a suitable concentration solution of HCI to a series of different content aniline standard solutions until the value of pH of a certain number and the read of the value of HCI consumed, a graph for this titration carried out in 95% ethanol solution is made. The linear correlation coefficient of the curve is 0. 996. According to this curve, the content of aniline in an unknowable sample from the volume of HCI consumed in the titration is determined. This method is used in the dete.rmination of the content of aniline in diphenylamine. The results show that the method is very accurate with relative error of less than 1. 2%, and related mean deviation of 0. 2% and the determination is irrespective of the presence of diphenylamine. Compared with ordinary methods, it needs neither separate aniline from diphenylamine nor standard action titratant.
出处
《火炸药学报》
EI
CAS
CSCD
2005年第4期83-85,共3页
Chinese Journal of Explosives & Propellants
关键词
分析化学
恒pH值滴定
苯胺
二苯胺
analytical chemistry
constant pH titremetric method
aniline
diphenylamine
