Ferron逐时比色法中显色剂Ferron浓度对Al-Ferron体系反应动力学的影响

Study on the Effect of Ferron Concentration on the Al-Ferron Reaction Kinetics with Ferron Timed Colorimetric Method

Ferron逐时比色法中Al-Ferron体系反应动力学常被视为准一级反应,由此可推得相应的拟合方程并测得相应的反应速率常数kb,显色剂Ferron作为反应物之一其用量必然直接影响测量的结果。以不同OH/Al比的聚合氯化铝溶液为研究对象,抓住Ferron浓度这一核心要素,对Al-Ferron体系反应动力学过程进行了系统研究。结果表明,[Ferron]≥2.0×10^(-3)mol/L是确保动力学速率常数kb准确测量的基本保证。

The reaction between aluminum （A1） and Ferron is considered as pseudo-first-order kinetics, from which the fitting equation as well as the corresponding reaction rate constant ks can be obtained. As one of the reactants, Ferron dosage would have a direct influence on the measurement results. However, the effect of Ferron concentration （[Ferron]） on ks for polyaluminum chloride （PAC） solution has not been investigated in detail in the previous researches. In this paper, focusing on the key issue of [Ferron], systematic studies have been conducted on the reaction kinetics of Al-Ferron system. The results showed that [Ferron]≥2.0×10^-3mol/L is the essential condition for accurate measurement of ks.