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| Rapid Determination of Calcium and Magnesium in Ore by EDTA Complexometric Titration |
| Received:October 24, 2018 Revised:October 24, 2018 |
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| DOI：doi:10.3969/j.issn.2095-1035.2019.02.012 |
| KeyWord:volumetric method; ICP-AES; ore; calcium; magnesium. |
| Author | Institution |
| HAN Xiao |
北矿检测技术有限公司 |
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| Abstract: |
| SThe sample was decomposed by hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid, and at pH 6-9, Fe, Al, Cr, Ti, Ag, Hg, Bi, Ni, Co, Pb, Zn, Cu, Cd and Mn were separated by hexamethylenetetramine-copper reagent, followed by acid chromium blue K-naphthol green B in ammonia solution of pH=10 and ammonium chloride buffer solution of ammonia chloride. Calcium and magnesium were determined by EDTA complexometric titration as indicator and calcium was determined by EDTA complexometric titration in potassium hydroxide solution with calcium reagent as indicator. The content of magnesium or calcium (< 5%) with low content can be accurately determined by ICP-AES when the sample is high in calcium and low in magnesium and high in calcium. Calcium and magnesium in three standard samples were determined by this method. The results were in agreement with the certified values. The relative standard deviation was between 0.85% and 1.25% (n=7), and the recovery was between 98% and 101%. This method is practical and has been successfully applied to the determination of calcium and magnesium in various ores. |
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