| 光谱学与光谱分析 |
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| Effect of Octadecyl Amine (ODA) on the Complex Titration of Magnesium and Calcium Ions Studied with UV-Visible Spectrophotometry |
| QING Bin-ju1,2, LIU Hai-ning1,2, YE Xiu-shen1,2, LI Quan1, GUO Min1,2, LIU Teng-yun1,2, WU Zhi-jian1* |
1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
2. The Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The effect of flotation agent octadecyl amine (ODA) on the complex titration of both magnesium and calcium ions was studied with two groups of comparative experiments：(1) Before titration, the suspension was not filtered. In this case, ODA had a great effect on the complex titration of both magnesium and calcium ions. The titration end-point of magnesium ions was difficult to be determined. Although the titration end-point of calcium ions could be determined, there was an obvious experimental error compared with the blank solution without ODA. These results were confirmed by the UV-Visible spectrum analyses of the related solutions. (2) Before titration, the suspension was filtered. In this case, the influence of ODA on the complex titration of both magnesium and calcium ions could be removed. UV-Visible spectrum studies showed that, in this case, both the spectra and time scanning curves of the tested solutions were similar to those of the blank solutions.
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Received: 2008-09-02
Accepted: 2008-12-06
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Corresponding Authors:
WU Zhi-jian
E-mail: zjw6512@hotmail.com
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[1] GUO Qing-lin, ZHOU Yu-long, ZHANG Qiu-lin, et al(郭庆林, 周玉龙, 张秋琳, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2008, 28(1): 200.
[2] Analytical Laboratory, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences(中国科学院青海盐湖研究所分析室编). Analytical Methods of Brines and Salts, Second Edition(卤水和盐的分析方法，第2版). Beijing: Science Press(北京: 科学出版社), 1988. 47.
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