| 容量法连续测定磷矿中的钙、镁 |
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| 引用本文： | 冯晓军,薛 菁. 容量法连续测定磷矿中的钙、镁[J]. 磷肥与复肥, 2013, 28(6): 67-68 |
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| 作者姓名： | 冯晓军 薛 菁 |
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| 作者单位： | 云南磷化集团 磷资源开发利用工程技术研究分公司，云南 昆明 650113 |
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| 摘 要： | 介绍采用容量法连续测定磷矿中氧化钙、氧化镁质量分数的方法.在pH 10溶液中,以酸性铬蓝K-萘酚绿B作指示剂用EDTA滴定钙、镁合量,然后调节至pH＞13,以钙黄绿素-酚酞为指示剂用钙标准溶液反滴定氧化镁质量分数,差减计算氧化钙质量分数.该方法重现性和准确度较好,适用于磷矿中钙、镁含量的快速分析.
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| 关 键 词： | 容量法 磷矿 氧化钙 氧化镁 |
| 修稿时间： | 2013-11-15 |
Determination of calcium and magnesium in phosphate rock by volumetric method |
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| FENG Xiao-jun,XUE Jing. Determination of calcium and magnesium in phosphate rock by volumetric method[J]. Phosphate & Compound Fertilizer, 2013, 28(6): 67-68 |
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| Authors: | FENG Xiao-jun XUE Jing |
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| Affiliation: | (Phosphate Resource Development and Utilization Engineering Research Branch Company, Yunnan Phosphate Chemical Group Co., Ltd, Kunming, Yunnan 650113, China) |
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| Abstract: | Determination of calcium and magnesium in phosphate rock by volumetric method is introduced. In the solution with pH of 10, calcium and magnesium contents are determined with acid chrome blue K- naphthol green B as indicator by EDTA; Then adjusting pH 〉 13 and with calcein-thymolphthalein as indicator, magnesium oxide content is determined by back titration with calcium standard solution, calcium oxide content is determined by calculation. The method is accurate and has good reproducibility, which is suitable for rapid analysis calcium and magnesium content in phosphate rock. |
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| Keywords: | volumetric method phosphate rock calcium oxide magnesium oxide |
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