引用本文:
李晶, 郑立庆, 张甜甜, 李全民. 赖氨酸-甲醇-1,2-萘醌-4-磺酸钠体系褪色光度法测定甲醇[J]. 应用化学,
2010, 27(4): 484-487.
doi:
10.3724/SP.J.1095.2010.90252
Citation: LI Jing, ZHENG Li-Qing, ZHANG Tian-Tian, LI Quan-Min. Decolouring Spectrophotometric Determination of Methanol in Lysine-Methanol-Sodium 1,2-Naphthoquinone-4-sulfonate System[J]. Chinese Journal of Applied Chemistry, 2010, 27(4): 484-487. doi: 10.3724/SP.J.1095.2010.90252
Citation: LI Jing, ZHENG Li-Qing, ZHANG Tian-Tian, LI Quan-Min. Decolouring Spectrophotometric Determination of Methanol in Lysine-Methanol-Sodium 1,2-Naphthoquinone-4-sulfonate System[J]. Chinese Journal of Applied Chemistry, 2010, 27(4): 484-487. doi: 10.3724/SP.J.1095.2010.90252
赖氨酸-甲醇-1,2-萘醌-4-磺酸钠体系褪色光度法测定甲醇
English
Decolouring Spectrophotometric Determination of Methanol in Lysine-Methanol-Sodium 1,2-Naphthoquinone-4-sulfonate System
Abstract:
A simple decolouring spectrophotometric method for the determination of methanol was developed in this work.A russety product can be formed by the reaction between Lysine(Lys) and sodium 1,2-naphthoquinone-4-sulfonate(NQS) in an alkaline solution.When methanol was added to the solution,the system involves decolouring process.Beer's law is held in a range of methanol concentration of 0.050~7.61 g/L at a maximal decolouring wavelength of 559 nm.The equation of linear regression is A=-0.00517-0.08679c(g/L),with a linearly correlation coefficient of 0.9996.The detection limit of methanol is 49.5 mg/L(3σ) and the recovery rate is in a range of 99.1%~102.6%.Analytical results obtained with this method are satisfactory.
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Key words:
- methanol
- / lysine
- / sodium naphthoquinone-sulfonate
- / spectrophotometry
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