| MB-SiMo-OP光度法测定水中痕量活性二氧化硅的研究 |
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| 引用本文： | 曹金朋,董慧茹. MB-SiMo-OP光度法测定水中痕量活性二氧化硅的研究[J]. 北京化工大学学报(自然科学版), 2005, 32(6): 106-109 |
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| 作者姓名： | 曹金朋 董慧茹 |
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| 作者单位： | 北京化工大学理学院,北京,100029;北京化工大学理学院,北京,100029 |
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| 基金项目： | 天津石油化工公司资助项目 |
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| 摘 要： | 建立了亚甲基蓝（MB）-硅钼杂多酸（SiMo）-聚乙二醇辛基苯基醚（OP）显色体系测定痕量活性二氧化硅的新方法。在pH＝0.77时，非离子表面活性剂OP存在下，亚甲基蓝-硅钼杂多酸离子缔合物的最大吸收波长λmax＝595nm，摩尔吸光系数ε＝1.74×105L/(mol·cm)，二氧化硅质量浓度在0～0.24μg/mL范围内符合比耳定律 。
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| 关 键 词： | 活性二氧化硅 亚甲基蓝 聚乙二醇辛基苯基醚 分光光度法 |
| 收稿时间： | 2005-04-07 |
| 修稿时间： | 2005-04-07 |
Spectrophotometric determination of reactive silica with a methylene blue-molybdosilicate-polyglycol octylphenyl ether system |
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| CAO Jin-peng,DONG Hui-ru. Spectrophotometric determination of reactive silica with a methylene blue-molybdosilicate-polyglycol octylphenyl ether system[J]. Journal of Beijing University of Chemical Technology, 2005, 32(6): 106-109 |
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| Authors: | CAO Jin-peng DONG Hui-ru |
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| Affiliation: | College of Science, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | A new method was developed for determination of the reactive silica based on the system of methylene blue-molybdosilicate-OP polyglycol octylphenyl ether. In the presence of nonionic surfactant OP, methylene blue could react with molybdosilicate to form an ion-associate at pH＝0.77. The molar absorptivity of the ion associate was 1.74×105L/(mol·cm) at 595nm. Beer's law was obeyed in the range of 0～0.24μg/mL SiO2. The method can be applied to the determination of reactive silica in some water samples with satisfactory results. |
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| Keywords: | reactive silica methylene blue OP spectrophotometry |
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