Sun B, Ye Y, Huang H, Bai Y
Department of Chemistry, Zhengzhou University, Zhengzhou, Henan, 450052, People's Republic of China.
Talanta. 1993 Jun;40(6):891-5. doi: 10.1016/0039-9140(93)80047-u.
A new method for determining iron is based on both nonlinear regression calibration plots and parabolic interpolation using a fluoride ion-selective electrode (ISE) and the Apple II-ISE intelligent ion Analyzer developed by ourselves. The experimental conditions for determining iron are discussed. The appropriate acidity of the experimental solution is pH 3, controlled by total ionic strength adjustment buffer (TISAB) that is composed of glycine (aminoacetic acid), nitric acid and sodium nitrate. The suitable total concentration of fluoride is equal to the highest concentration of iron in the standard series. Because the mathematical model of the method coincides with the experimental data the Apple II-ISE intelligent ion Analyzer can perform data acquisition and data processing, and the performance of fluoride electrode is excellent, the new method for determination of iron is fast and accurate. This method has been used successfully in the determination of iron in mineral samples.
一种测定铁的新方法基于非线性回归校准曲线和抛物线插值法，使用氟离子选择性电极（ISE）以及我们自行研制的Apple II - ISE智能离子分析仪。讨论了测定铁的实验条件。实验溶液的适宜酸度为pH 3，由甘氨酸（氨基乙酸）、硝酸和硝酸钠组成的总离子强度调节缓冲液（TISAB）控制。氟化物的适宜总浓度等于标准系列中铁的最高浓度。由于该方法的数学模型与实验数据相符，Apple II - ISE智能离子分析仪可进行数据采集和数据处理，且氟电极性能优异，因此测定铁的新方法快速准确。该方法已成功用于矿物样品中铁的测定。
