| 蒸馏-硝酸钍容量法测定氟含量不确定度评定 |
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| 引用本文： | 张小霞. 蒸馏-硝酸钍容量法测定氟含量不确定度评定[J]. 无机盐工业, 2013, 45(7): 59-60 |
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| 作者姓名： | 张小霞 |
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| 作者单位： | 多氟多化工股份有限公司，河南焦作 454006 |
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| 摘 要： | 对蒸馏-硝酸钍容量法测定冰晶石及氟化铝中氟含量的不确定度来源进行分析，通过建立数学模型，评定各分量的不确定度，并计算蒸馏-硝酸钍容量法测定氟元素含量的扩展不确定度。实验原理：试样用无水碳酸钠熔融，经硫酸-水蒸气蒸馏分离氟后，以茜素磺酸钠和次甲基蓝作指示剂，用硝酸钍标准溶液滴定测定样品中氟含量。评定结果表明，蒸馏-硝酸钍容量法测定氟含量结果的扩展不确定度为0.42％。
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| 关 键 词： | 蒸馏 容量法 氟含量 不确定度 |
Uncertainty evaluation for determination of fluorine content by distillation-thorium nitrate volumetric method |
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| Zhang Xiaoxia. Uncertainty evaluation for determination of fluorine content by distillation-thorium nitrate volumetric method[J]. Inorganic Chemicals Industry, 2013, 45(7): 59-60 |
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| Authors: | Zhang Xiaoxia |
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| Affiliation: | Do-Fluoride Chemicals Co.,Ltd.,Jiaozuo 454006,China |
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| Abstract: | The uncertainty sources in determination of fluorine content of cryolite and aluminium fluoride by distillation-thorium nitrate volumetric method were analyzed.Evaluation for the uncertainty of each component was carried out by establishing the mathematic model，and the expanded uncertainty of fluorine content determination with distillation-thorium nitrate volumetric method was also calculated.Experimental principle：melt the sample with anhydrous sodium carbonate，separate fluoride through sulfuric acid-water vapor distillation，taking sodium alizarin sulfonate and methylene blue as indicators，using thorium nitrate standard solution to titrate fluorine content in the sample.Evaluation results indicated that，the expanded uncertainty of thorium nitrate volumetric method for the determination of fluorine content was 0.42%. |
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| Keywords: | distillation volumetric method fluorine content uncertainty |
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