氟离子电极用于饮水中氟的测定,一般都能获得满意的结果。但经使用去氟灵(AlCl_3·6H_2O)除氟后的饮水,由于引进较大量的铝(理论计算值为24毫克/升),虽经一定时间沉降,残余的铝仍然致使氟的测定严重偏低。按本文提出使用 TlSAB—Ⅰ,可使控制分析获得满意的结果。采用 TlSAB—Ⅱ,即使每升饮水中含铝50毫克,也不影响氟的测定。本文讨论了上述两种离子液对铝的掩蔽效果,拟定了实验方法,并对样品进行了测定。本方法的测定下限为0.3毫克/升。回收率为96.5—106％。 Fluoride electrode for the determination of fluoride in drinking water, generally can get satisfactory results. However, after de-fluoride drinking water with dexflurane (AlCl_3 · 6H_2O), due to the introduction of a larger amount of aluminum (theoretically calculated value of 24 mg / l), residual aluminum still causes severe determination of fluorine even after a certain time of settling low. According to this paper, the use of TlSAB-Ⅰ, control analysis can be satisfactory results. The use of TlSAB-II, even with 50 mg of aluminum per liter of drinking water, does not affect the determination of fluorine. In this paper, the masking effect of the two ionic liquids on aluminum was discussed, the experimental method was drawn, and the samples were measured. The method of determination of the lower limit of 0.3 mg / liter. The recovery rate was 96.5-106%.