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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 shu

Decolouring Spectrophotometric Determination of Methanol in Lysine-Methanol-Sodium 1,2-Naphthoquinone-4-sulfonate System

Henan Key Laboratory for Environmental Pollution Control, College of Chemistry and Environmental Science, Henan Normal University;Xinxiang 453007

Received Date: 9 April 2009
Revised Date: 10 August 2009

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.
- methanol,
- lysine,
- sodium naphthoquinone-sulfonate,
- spectrophotometry
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