| 张越.EDTA滴定法测定萤石中氟化钙含量的方法改进[J].中国无机分析化学,2019,9(4):36-39. |
| EDTA滴定法测定萤石中氟化钙含量的方法改进 |
| An improved method for determination of calcium fluoride in fluorite by EDTA titration |
| 投稿时间：2019-03-01 修订日期：2019-03-11 |
| DOI：10.3969/j.issn.2095-1035.2019.04.009 |
| 中文关键词: 萤石 EDTA 容量法 氟化钙 |
| 英文关键词:calcium fluoride EDTA titration calcium fluoride. |
| 基金项目: |
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| 中文摘要: |
| 研究建立了EDTA滴定法测定矿石中氟化钙的方法。本方法的改进在于，引入了钙乙酸为溶解试样的溶剂，溶解样品中的碳酸钙，同时，通过同离子效应减少氟化钙的溶解度。实验中探究了钙离子的浓度与氟化钙溶解度的关系，通过对比试验确定选择了含钙乙酸的最佳浓度。同时，对实验中的其他条件也进行了相应的探究与优化。此方法的精密度均小于9%，准确度均小于10%。 |
| 英文摘要: |
| A method for determination of calcium fluoride in ore by EDTA titration was established. Calcium acetate was introduced as the solvent to dissolve the sample, calcium carbonate in the sample was dissolved, and the solubility of calcium fluoride was reduced by the same ion effect. In the experiment, the relationship between the concentration of calcium ions and the solubility of calcium fluoride was explored, and the optimal concentration (10 g/L) containing calcium acetic acid was determined through comparative experiment. At the same time, other conditions in the experiment were also explored and optimized, and the optimal experimental conditions were determined as follows: the minimum weighing sample size was 0.5 g. Washing and precipitation water consumption is about 50 mL; The washing times of the second filtration were 8~10 times.The amount of potassium hydroxide added in titration was 20 mL. The precision (0.10%) and accuracy (0.08%) of the method can meet the experimental requirements. |
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