| 溶液中钙镁含量准确测定的方法研究 |
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| 引用本文： | 武涵,俞秀丽,吴晓娅,付晓艺,尹霞,曾德文.溶液中钙镁含量准确测定的方法研究[J].盐湖研究,2013(4):29-33. |
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| 作者姓名： | 武涵 俞秀丽 吴晓娅 付晓艺 尹霞 曾德文 |
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| 作者单位： | [1]湖南大学化学化工学院,湖南长沙410082 [2]中国科学院青海盐湖研究所,青海西宁810008 |
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| 基金项目： | 国家自然科学基金（J1210040,J1103312）;湖南省自然科学基金（11JJ2011）资助项目 |
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| 摘 要： | 经典测定钙、镁含量的方法是用EDTA标准溶液滴定钙镁总量后再滴定钙，此方法对于含钙、镁离子盐水体系溶解度的测定，尤其在镁含量较高的情况下，其分析精度和准确度远远迭不到要求。针对硝酸钙、硝酸镁混合样品，采用EDTA质量滴定法测定钙镁总量，用草酸钙沉淀法从镁中定量分离钙，然后运用羔减法计算出镁的含量。实验结果表明，当混合溶液中镁钙的质量比不超过10：1时，钙、镁离子分析结果的相对误差在±0．3％之内，但镁钙的质量比超过10：1时，相对误差达到1％。因此，在一定的镁钙质量比范围内，此方法可用于盐水体系中钙、镁含量的准确测定。
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| 关 键 词： | 硝酸钙 硝酸镬 EDTA 质量滴定法 草酸钙沉淀法 |
Method for Accurate Determination of Solution Containing Calcium and Magnesium |
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| WU Han,YU Xiu-li,WU Xiao-y,FU Xiao-yi,YIN Xi,ZENG De-wen.Method for Accurate Determination of Solution Containing Calcium and Magnesium[J].Journal of Salt Lake Research,2013(4):29-33. |
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| Authors: | WU Han YU Xiu-li WU Xiao-y FU Xiao-yi YIN Xi ZENG De-wen |
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| Institution: | 1. College of Chemistry and Chemical Engineering,Hunan University, Changsha ,410082, China; 2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences ,Xining ,810008 , China) |
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| Abstract: | Traditionally, the method of the EDTA titration, which is used to titrate total content of calcium and magnesium and the content calcium,is difficult to determine the content of Ca^2 ＋ and Mg^2 ＋in sah-wa- ter solution which the amount of magnesium present the high precision requirement of solubility data. In is more .than the calcium. The accuracy can＇ t reach this paper, the total content of calcium and magnesi-um was determined with EDTA mass titration for mixture solution containing calcium nitrate and magnesi- um nitrate. Calcium can be quantitatively separated from magnesium using calcium oxalate gravimetric method. Then the content of magnesium can be obtained by subtraction. The results show that when the mass ratio of Mg^2＋ ： Ca^2＋ is less than 10：1 ,the relative errors of analysis results can be controlled within ＋0. 3%. While the mass ratio is more than 10：1 ,the relative error approaches 1%. So this method can be applied to determine the contents of calcium and magnesium within a certain range of the mass ratio of magnesium and calcium in salt-water system accurately. |
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| Keywords: | Calcium nitrate Magnesium nitrate EDTA Mass titration Method Calcium oxalate gravimet-ric method |
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