| 甲醛法测定铵盐中氮滴定终点的判断 |
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| 引用本文： | 蔡彭骥. 甲醛法测定铵盐中氮滴定终点的判断[J]. 天津化工, 2004, 18(6): 55-56 |
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| 作者姓名： | 蔡彭骥 |
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| 作者单位： | 泰州职业技术学院,江苏,泰州,225300 |
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| 摘 要： | 甲醛法测定铵盐中的氮，由于在同一溶液中，实际使用了甲基红和酚酞两种指示剂，在以NaOH为标准溶液的滴定过程中，应注意溶液中的两种指示剂颜色的变化过程，当溶液呈现微橙红色并保持30s不褪色才为滴定终点。
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| 关 键 词： | 甲醛法 铵盐 滴定终点 微橙红色 |
| 文章编号： | 1008-1264(2004)06-0055-02 |
| 修稿时间： | 2004-04-16 |
Determination of titration end-point by formaldehyde method for measuring nitycgen in the ammonium sale solution |
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| CAI Pen-ji. Determination of titration end-point by formaldehyde method for measuring nitycgen in the ammonium sale solution[J]. Tianjin Chemical Industry, 2004, 18(6): 55-56 |
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| Authors: | CAI Pen-ji |
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| Abstract: | Two types of indicatiors of methyl red and phenolphthalein had been used actually in the same Solution when we measured nitrogen in the ammonium Sale Solution. By formaldehyde method. During the course of tieraction based the standard sodium-hydroxide solution, the variable process of colour of two indicators should be paid attention to. It's titration end-point when the colour of the solution appeared light orange-red and didn't fad in thirty seconds. |
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| Keywords: | Formaldehyde method ammonium Salt titration end-point light orange-red. |
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