| Al3+对电位滴定仪测定游离酸的干扰及其消除研究 |
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| 引用本文： | 李子尚,张志勇,彭小燕,杨林,陈述. Al3+对电位滴定仪测定游离酸的干扰及其消除研究[J]. 中国无机分析化学, 2022, 12(5): 105-110 |
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| 作者姓名： | 李子尚 张志勇 彭小燕 杨林 陈述 |
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| 作者单位： | 长沙矿冶研究院有限责任公司,长沙矿冶研究院有限责任公司,长沙矿冶研究院有限责任公司,长沙矿冶研究院有限责任公司,长沙矿冶研究院有限责任公司 |
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| 基金项目： | 国家自然科学基金青年科学基金项目（5200041112） |
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| 摘 要： | 溶液中Al3+易水解，对游离酸的测定存在严重干扰。本文以NaF溶液掩蔽Al3+，用自动电位滴定仪测定含Al3+溶液中的游离酸含量，通过溶液化学分析论证了NaF溶液掩蔽Al3+的可行性。NaF掩蔽-自动电位滴定法测定含Al3+溶液中游离酸含量的精密度实验RSD小于2.0%，方法的加标回收率在98.00%～103.00%之间，与手动滴定法对比可靠性检验结果t=0.25；以上结果表明该方法具有准确度高、重复性好的优点。
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| 关 键 词： | 电位滴定仪；游离酸；Al3+；NaF |
| 收稿时间： | 2021-11-25 |
| 修稿时间： | 2021-12-19 |
Interference of Al3+ on the determination of free acid by potentiometric titrator and its elimination |
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| Li Zishang,Zhang Zhiyong,Peng Xiaoyan,Yang Lin and Chen Shu. Interference of Al3+ on the determination of free acid by potentiometric titrator and its elimination[J]. Chinese Journal of Inorganic Analytical Chemistry, 2022, 12(5): 105-110 |
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| Authors: | Li Zishang Zhang Zhiyong Peng Xiaoyan Yang Lin Chen Shu |
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| Affiliation: | Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha Hunan,Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha Hunan,Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha Hunan,Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha Hunan,Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha Hunan |
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| Abstract: | Interference of Al3+ on the determination of free acid by potentiometric titrator and its elimination Al3+ in solution is easy to hydrolyze, which seriously interferes with the determination of free acid. In this paper, NaF solution is used to mask Al3+, and the content of free acid in Al3+ containing solution is determined by automatic potentiometric titrator. The feasibility of masking Al3+ by NaF solution is demonstrated through solution chemical analysis. The precision of NaF masking automatic potentiometric titration for the determination of free acid content in Al3+ containing solution is less than 2.0%, the recovery of standard addition is 98.00% ~ 103.00%,and compared with manual titration, the reliability test result is t = 0.25. The results above show that the method has the advantages of high accuracy and good repeatability. |
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| Keywords: | potentiometric titrator residual acid Al3+ NaF |
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