Color Change of Sudan III against Concentrated Sulfuric Acid in Acetonitrile and Quantification for a Small Amount of Concentrated Sulfuric Acid
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- SAKURAI Takao
- Criminal Investigation Laboratory, Metropolitan Police Department Graduate School of Bio-applications and Systems Engineering, Tokyo University of Agriculture and Technology
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- KURATA Shoji
- Criminal Investigation Laboratory, Metropolitan Police Department
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- OGINO Kenji
- Graduate School of Bio-applications and Systems Engineering, Tokyo University of Agriculture and Technology
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Abstract
The color-changing phenomenon of hydrophobic bisazo dye, Sudan III in an acetonitrile solution against the addition of concentrated sulfuric acid has been discovered and the chromic properties investigated. Based on observations, a novel quantification method of concentrated sulfuric acid has been developed. Sudan III changes its color from orange to blue against a small volume of sulfuric acid, and the acetonitrile solution of Sudan III is the most suitable for observing the color-change phenomenon. 1H-NMR and UV-Vis spectroscopic studies showed that the color-change mechanism of Sudan III against sulfuric acid is due to the protonation of the dye by sulfuric acid. This phenomenon is applicable to the quantification of concentrated sulfuric acid by introducing the Hammett acidity function. The proposed method requires only a small amount of the sample, 0.04 mL, and enables rapid quantification.
Journal
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- Analytical Sciences
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Analytical Sciences 32 (2), 129-133, 2016
The Japan Society for Analytical Chemistry
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Keywords
Details 詳細情報について
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- CRID
- 1390282679236646400
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- NII Article ID
- 130005125629
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- NII Book ID
- AA10500785
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- ISSN
- 13482246
- 09106340
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- NDL BIB ID
- 027107203
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- PubMed
- 26860554
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed