| 硫氰酸盐比色法测定钨的改进 |
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| 引用本文： | 杭健,高若柳.硫氰酸盐比色法测定钨的改进[J].岩矿测试,2011,30(2):226-229. |
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| 作者姓名： | 杭健 高若柳 |
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| 作者单位： | 中国地质调查局西安地质调查中心,陕西,西安,710054 |
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| 基金项目： | 内蒙古自治区地质勘查基金资助 |
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| 摘 要： | 硫氰酸盐比色法测定钨是基于W5+与硫氰酸盐形成黄色络合物。为使钨完全还原为5价,通常单独使用三氯化钛或氯化亚锡作还原剂。此方法在应用过程中,由于Ti3+本身呈紫色,加多会掩盖络合物的黄色,加少则出现硫氰酸铁之红色丝状物影响比色的情况。通过大量的试验,采用氯化亚锡-三氯化钛作双还原剂,控制最佳酸度、温度和时间,从而获得稳定的络合物,提高了分析结果的稳定性。通过对国家一级标准物质进行分析验证,从而证实方法可行,能够保证样品的测试精密度和准确度。本方法尤其适用于低含量、大批量钨矿样品的测定。
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| 关 键 词： | 氯化亚锡 三氯化钛 比色法 钨 还原剂 |
| 收稿时间： | 2010/5/15 0:00:00 |
| 修稿时间： | 9/5/2010 12:00:00 AM |
Improvement of Determination of Tungsten by Thiocyanate Colorimetry |
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| HANG Jian and GAO Ruo-liu.Improvement of Determination of Tungsten by Thiocyanate Colorimetry[J].Rock and Mineral Analysis,2011,30(2):226-229. |
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| Authors: | HANG Jian and GAO Ruo-liu |
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| Institution: | Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China;Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China |
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| Abstract: | Thiocyanate colorimetric method used in determination of tungsten is based on the fact that W5+ reacts with thiocyanate and forms a yellow complex.In order to reduce tungsten to W5+ completely,titanium trichloride or stannous chloride were generally used as reducing agents.In application,when adding more reducing reagents,Ti3+ purple color masks yellow color from the complex,and when adding less reducing reagents,red ferric rhodanide affects determination.Through plenty of experiments,titanium trichloride a... |
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| Keywords: | titanium trichloride stannous chloride colorimetric method tungsten reducing agent |
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