Abstract：A new method for the determination of fluoride ion in complex zinc sulfate solution system is studied in the total ionic strength adjustment buffer (TISAB) liquid system by standard addition method with a fluoride ion-selective electrode. The results show that there is a good linear relationship between the negative logarithm of fluoride ion concentration and the corresponding measured electrode potential when the fluoride ion mass concentration is between 0.5 mg/L and 38.0 mg/L, with correlation coefficient of r=0.999 8. According to the change of electrode potential after adding standard solution, fluoride ion concentration in zinc sulfate solution can be measured and calculated directly. For 2 mg/L F-, 2.0×104 times Zn2+, 1.0×103 times Fe2+, 1.2×103 times Al3+, 1.0×103 times Mg2+ and 1.1×103 times Ca2+ don’t interfere in the determination. The proposed method has been applied successfully to determine fluoride ion in complex zinc sulfate solution system. The limit of detection is 0.023 mg/L. The relative standard deviation(RSD) are less than or equal to 2.0 %, and the addition standard recovery of fluoride ion is in the range of 99%-102%. The results of this method are consistent with those of ion chromatography.
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