Determination of isocyanate groups in the organic intermediates by reaction-based headspace gas chromatography.
This work reports on a novel method for the determination of isocyanate groups in the related organic intermediates by a reaction-based headspace gas chromatography. The method is based on measuring the CO2formed from the reaction between the isocyanate groups in the organic intermediates and water in a closed headspace sample vial at 45°C for 20min. The results showed that the method has a good precision and accuracy, in which the relative standard deviation in the repeatability measurement was 5.26%, and the relative differences between the data obtained by the HS-GC method and the reference back-titration method were within 9.42%. The present method is simple and efficient and is particularly suitable to be used for determining the isocyanate groups in the batch sample analysis.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China; School of Materials Science and Engineering, South China University of Technology, Guangzhou, China.
Wei-Qi
WQ
Xie
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China. Electronic address: xschai@gmail.com.
Xin-Sheng
XS
Chai
D002849:Chromatography, Gas / Q000379:methods; D017953:Isocyanates / Q000032:analysis*; D015203:Reproducibility of Results; D014867:Water / Q000737:chemistry
D017953:Isocyanates; D014867:Water
Carbon dioxide; Headspace gas chromatography; Isocyanate groups; Organic intermediates