【摘要】 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^-3mol/L是确保动力学速率常数kb准确测量的基本保证。更多还原

【Abstract】 The reaction between aluminum（Al）and Ferron is considered as pseudo-first-order kinetics,from which the fitting equation as well as the corresponding reaction rate constant kbcan 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 kbfor 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^-3 mol/L is the essential condition for accurate measurement of kb.更多还原