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
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.
卿彬菊1,2,刘海宁1,2,叶秀深1,2,李 权1,郭 敏1,2,刘腾云1,2,吴志坚1* . 紫外-可见分光光度法研究十八胺对钙、镁络合滴定的影响[J]. 光谱学与光谱分析, 2009, 29(10): 2829-2832.
QING Bin-ju1,2, LIU Hai-ning1,2, YE Xiu-shen1,2, LI Quan1, GUO Min1,2, LIU Teng-yun1,2, WU Zhi-jian1* . Effect of Octadecyl Amine (ODA) on the Complex Titration of Magnesium and Calcium Ions Studied with UV-Visible Spectrophotometry . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(10): 2829-2832.
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