阳离子淀粉表面活性剂电化学分析法的研究

A Study to Determine the Nitrogen Content of Surface-active Agent of Cation Starch Using Electrochemical Analysis

本文介绍了一种用离子选择电极测定阳离子淀粉中氮含量的新方法,结果表明,这种方法与凯氏法测定结果基本一致。两组均数经t检验p>0.20。电位法回收百分率为95.6～103.3％;精密度为2.73％(cv)x=0.3076％±0.0084％SD。与凯氏法近似。另外,此法简便快速,因此可用电位法代替凯氏法。 重金属离子Cu^(++)对此法有干扰,加入等摩尔浓度的EDTA可以消除。

A new method, Ion-Selective Electrodes method, for determining the nitrogen content of the cation starch, could substitute for the kjeldahl method.The contrast experiments showed that the new method had bettern and consistent results.It's more simple and more fast than kjeldah methods. The comparison of two groups of averages are p>0.20 by t examine. The rate of recovery in electrometric method is 95.6-103.3 per cent.The precition is 2.73 per cent (cv) x= 0.3076% ?0.0084% SD. As heavy metal ion Cu + + interferes potent iometric measurements, adding EDTA with the equal mol concentration can remove it.