离子色谱法测定石灰中F~-的含量

目的:建立用离子色谱测定石灰中F-含量的方法。方法:采用DX-120型离子色谱仪,IonPacAS14型分离柱,以1 mmol/L NaHCO3-3.5 mmol/L Na2CO3作淋洗液,流速为1.0 ml/min,对石灰中F-的含量进行测定。石灰样品用硫酸溶解,采用水蒸汽蒸馏法将F-以HF形式从样品中分离,用0.22μm微孔滤膜过滤后测定。结果:该方法的相关性好(r>0.999),相对标准偏差(RSD)为2.17%~3.14%,样品加标回收率为94.0%~103%,最低检出限为0.05 mg/L。结论:该方法操作简单、结果准确、灵敏度高,适用于石灰中F-含量的测定。

Determination of Fluoride Content in Lime by Ion Chromatography

Objective: To establish a new method for quantitative detection of fluoride in lime by Ion Chromatography(IC).Method: IC was carried on the DX-120 with IonPacAS14 anion separation column using a mixed solution of 1mmol/L NaHCO3 and 3.5mmol/L Na2CO3.The sample filtered with 0.22 um filter membrane was performed at a flow rate of 1.0 ml/min.Fluoride was extracted from lime dissolved in H2SO4 solution by Water Vapour Distillation.Result: The correlation coefficient was more than 0.999 and relative standard deviation was from 2.17% to 3.14%.The rates of recovery were 94.0%～103% and detection limit was 0.05mg/L.Conclusion: The method was proved to be high sensitive,accurate,simple and suitable for quick determination of fluoride in lime.