| 在淀粉存在下结晶紫-磷钼杂多酸光度法测定微量磷 |
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| 引用本文： | 开小明. 在淀粉存在下结晶紫-磷钼杂多酸光度法测定微量磷[J]. 光谱学与光谱分析, 2002, 22(3): 451-452 |
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| 作者姓名： | 开小明 |
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| 作者单位： | 安庆师范学院化学系,安徽,安庆,246011 |
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| 基金项目： | 安徽省普通高等学校基础课程教学实验室建设与改革项目 (编号 1 5) |
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| 摘 要： | 研究了在淀粉存在下结晶紫 磷钼杂多酸光度法测磷的方法。在 0 15mol·L- 1 H2 SO4 的介质中 ,缔合物的最大吸收峰为 5 4 8nm ,其表观摩尔吸光系数为 1 98× 10 5L·cm- 1 ·mol- 1 ,室温下至少稳定 2 4h。磷在0～ 8μg·(5 0mL) - 1 范围内符合比尔定律 ,磷与结晶紫之比为 1∶5 ,方法应用于铁基试样中磷的测定。
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| 关 键 词： | 测定 淀粉 结晶紫 磷钼杂多酸 光度法 磷 微量分析 铁基试样 |
| 文章编号： | 1000-0593(2002)03-0451-02 |
| 修稿时间： | 2001-12-26 |
Spectrophotometric Determination of Microamount Phosphorus with Crystal Violet-Heteropoly Molybdophosphoric Acid in the Presence of Starch |
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| KAI Xiao ming. Spectrophotometric Determination of Microamount Phosphorus with Crystal Violet-Heteropoly Molybdophosphoric Acid in the Presence of Starch[J]. Spectroscopy and Spectral Analysis, 2002, 22(3): 451-452 |
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| Authors: | KAI Xiao ming |
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| Affiliation: | Department of Chemistry, Anqing Normal College, Anqing 246001, China. |
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| Abstract: | The determination of phosphorus with crystal violet-heteropoly molybdophosphoric acid in the presence of starch has been studied. In the medium of 0.15 mol.L-1 H2SO4, the apparent molar absorptivity of the ion associated complex is 1.98 x 10(5) L.cm-1.mol-1 at 548 nm, and it is stable for more than 24 hours. Beer's law is obeyed over the range of 0-8 micrograms.(50 mL)-1 for phosphorus. The molar ratio of heteropoly molybdophosphoric acid to crystal violet is established to be 1:5. The method is satisfactory for the determination of phosphorus in iron basic samples. |
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| Keywords: | Starch Crystal violet Heteropoly molybdophosphoric acid Spectrophotometry Phosphorus |
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