| 测定酱油中的氨基氮时终点确定方法的研究 |
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| 引用本文： | 蔡锦萍,胡明方.测定酱油中的氨基氮时终点确定方法的研究[J].西南师范大学学报(自然科学版),1991,16(3):345-348. |
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| 作者姓名： | 蔡锦萍 胡明方 |
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| 作者单位： | 西南师范大学化学系 重庆630715
(蔡锦萍)，西南师范大学化学系 重庆630715(胡明方) |
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| 摘 要： | 用甲醛法测定酱油中的氨基氮时,常用酚酞为指示剂确定终点,效果不佳.本法改用酚酞-溴百里酚蓝混合指示剂来确定滴定终点,其变色锐敏、重现性好、准确度高.
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| 关 键 词： | 酱油 氨基氮 测定 甲醛法 酚酞 |
STUDY ON METHODS OF DETERMINING THETERMINAL POINT OF TITRATION DURING MEASURING THE CONTENT OF AMINO NITROGEN IN SOY SAUCE |
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| Cai Jinping Hu Mingfang.STUDY ON METHODS OF DETERMINING THETERMINAL POINT OF TITRATION DURING MEASURING THE CONTENT OF AMINO NITROGEN IN SOY SAUCE[J].Journal of Southwest China Normal University(Natural Science),1991,16(3):345-348. |
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| Authors: | Cai Jinping Hu Mingfang |
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| Abstract: | Phenolphthalein is often used as indicator in order to determine the terminal point of titration during measuring the content of amino nitrogen in soy sauce by formaldehyde method. But the result isn't satisfactory. The authors applied mixed indicator of phenolphthalein and dibromothymolsulfonphthalc to deter-mine the terminal point of titration. The results show that the method has a high sensitivity of the colour change and the accuracy and the properties of reappearance both are excellent. |
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| Keywords: | formaldehyde phenolphthalein dibromothymolsul fonphthalein |
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