设定了Visual minteq软件F--Al3+体系的物种及平衡常数.模拟滴定和实验滴定结果的相似性证明了软件设定的合理.对F-(0.01/0.1 mol/L)-Al3+ (0.02 mol/L)-OH-体系的模拟和分析表明,当F与Al摩尔比相差大时,体系平衡物种分布不同,OH-掩蔽铝的机理也不同,但是在pH值11～12铝都被成功掩蔽;不同的反应机理导致F与Al摩尔比大的体系模拟和滴定曲线差别较大.进一步模拟得到了此pH值区间的最大可掩蔽铝浓度.考虑OH-对氟离子电极的影响,最终确定高氟(0.01～0.1 mol/L)高铝体系氟的测定条件:控制pH值为(11.5±0.2),不大于0.02 mol/L的铝.误差分析表明,当电势测定误差较大时,标准曲线法比标准加入法误差小.
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