Determination of Binary Mixtures of Nitramines by aSpectrophotometric Method Using Partial Least Squares Multivariate Calibration

✍ Scribed by M. Chaloosi; F. Gholamian; M. A. Zarei

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 86 KB
• Volume: 26
• Category: Article
• ISSN: 0721-3115
• DOI: 10.1002/1521-4087(200101)26:1<21::aid-prep21>3.0.co;2-x

✦ Synopsis

The UV-absorption spectra of cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX) and cyclo-1,3,5,7-tetramethylene-2,4,6,8-tetranitramine (HMX) are strongly overlapping and do not allow their direct determination without previous separation by conventional methods. A partial least squares method (PLS) in a multicomponent analysis provides a sensitive and accurate technique for the analysis of complex mixtures with strong overlapping spectra. The experimental calibration matrix was designed with 15 samples. The concentration varied between 0.584 mg=ml and 10.220 mg=ml for HMX, and between 0.400 mg=ml and 8.000 mg=ml for RDX. The cross-validation method was used to select the number of factors. To check the accuracy of the proposed method, the optimized model obtained by using PLS-2 was applied to the determination of these compounds in industrial samples.