Quantitative analysis of CL-20 explosive by smartphone-based chemiluminescence method.

Area of Science:

• Analytical Chemistry
• Forensic Science
• Materials Science

Background:

• Quantitative analysis of high explosives like CL-20 is critical for security and safety.
• Existing analytical methods can be complex, time-consuming, or require specialized equipment.
• Development of rapid, portable, and cost-effective detection techniques is highly desirable.

Purpose of the Study:

• To develop and validate a smartphone-based chemiluminescence method for the quantitative analysis of CL-20 explosive.
• To optimize reaction conditions including solvent mixture, oxidizer, and reactant concentrations.
• To assess the method's performance in terms of dynamic range, limit of detection, and interference from synthesis precursors.

Main Methods:

• Utilized a luminol-NaClO chemiluminescence reaction system.
• Optimized reactant concentrations and solvent mixture (DMSO/H2O) using statistical methods.
• Employed a smartphone as a detector to capture chemiluminescence intensity as video, processed using MATLAB.
• Investigated interference from CL-20 precursors (TADB, HBIW, TADNIW) and tested on spiked soil and water samples.

Main Results:

• CL-20 exhibited a quenching effect on the luminol-NaClO chemiluminescence intensity.
• The method achieved a dynamic range of 2.0-240.0 mg·L⁻¹ and a limit of detection of 1.1 mg·L⁻¹.
• No significant interference was observed from CL-20 precursors.
• The method demonstrated satisfactory performance for analyzing CL-20 in spiked soil and water samples.

Conclusions:

• A sensitive and selective smartphone-based chemiluminescence method for CL-20 quantification has been successfully developed.
• The proposed method is suitable for on-site or field analysis due to its portability and simplicity.
• The findings contribute to the advancement of rapid explosive detection technologies.