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以氟离子选择电极为指示电极,饱和甘汞电极为参比电极,实验加入阴离子表面活性剂十二烷基硫酸钠(SDS)考察其对电极灵敏度的影响。结果表明,SDS对电极的增敏效果显著,检出限由1.6873×10-5mg/L下延到7.4387×10-7mg/L;且电极响应时间延长,稳定性提高。该法用于雨水、自来水、含氟废水痕量氟的测定,结果令人满意。
The fluoride ion-selective electrode was used as the indicator electrode and the saturated calomel electrode was used as the reference electrode. The anionic surfactant sodium dodecyl sulfate (SDS) was used to investigate the effect on the sensitivity of the electrode. The results showed that the sensitization effect of SDS to the electrode was remarkable, the detection limit was prolonged from 1.6873 × 10-5mg / L to 7.4387 × 10-7mg / L, and the electrode response time was prolonged and the stability was improved. The method is applied to the determination of trace fluorine in rain water, tap water and fluorine-containing wastewater with satisfactory results.