Quantitative analysis of CL‐20 explosive by smartphone‐based chemiluminescence method

Abstract

AbstractA new smartphone‐based chemiluminescence method has been introduced for the quantitative analysis of CL‐20 (Hexanitroazaisowuertzitan) explosive. The solvent mixture, oxidizer agent, and concentration of the reactants were optimized using statistical procedures. CL‐20 explosive showed a quenching effect on the chemiluminescence intensity of the luminol−NaClO reaction in the solvent mixture of DMSO/H2O. A smartphone was used as a detector to record the light intensity of chemiluminescence reaction as a video file. The recorded video file was converted to an analytical signal as intensity luminescence–time curve by a written code in MATLAB software. Dynamic range and limit of detection of the proposed method were obtained 2.0–240.0 and 1.1 mg⋅L−1, respectively, in optimized concentrations 1.5 × 10−3 mol⋅L−1 luminol and 1.0 × 10−2 mol⋅L−1 NaClO. Precursors TADB, HBIW, and TADNIW in CL‐20 explosive synthesis did not show interference in measurement the CL‐20 purity. The analysis of CL‐20 spiked samples of soil and water indicated the satisfactory ability of the method in the analysis of real samples. The interaction of CL‐20 molecules and OCl− ions is due to quench of chemiluminescence reaction of the luminol−NaClO.