A quantitative chemiluminescent assay for analysis of peroxide-based explosives |
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Authors: | S Girotti E Ferri E Maiolini L Bolelli M D’Elia D Coppe F S Romolo |
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Institution: | 1.Dipartimento di Scienza dei Metalli, Elettrochimica e Tecniche Chimiche,Università di Bologna,Bologna,Italy;2.Gabinetto Regionale di Polizia Scientifica per l’Emilia Romagna,Bologna,Italy;3.Istituto Ricerche Esplosivistiche,Parma,Italy;4.Institut de Police Scientifique,Université de Lausanne,Lausanne,Switzerland;5.Dipartimento di Scienze Anatomiche, Istologiche, Medico-Legali e dell’Apparato Locomotore,Università di Roma “La Sapienza”,Roma,Italy |
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Abstract: | A quantitative chemiluminescent method, enabling indirect identification of the peroxide-based explosives TATP (triacetone
triperoxide) and HMTD (hexamethylene triperoxide diamine) has been developed. Treatment of these compounds with acidic solutions
produced peroxides, which were transformed into radical derivatives by horseradish peroxidase (HRP) and then quantified by
measuring the light emitted during their oxidation of luminol. The method was first developed in the microplate format and
later optimized for a portable luminometer, to enable rapid application of the assay directly on site. When the portable luminometer
was used each analysis took only 5–10 min. The method had good selectivity, sensitivity, and reproducibility; in the microplate
format the limits of detection (LOD) and quantification (LOQ) were 40 and 50 ng mL−1, respectively, for both TATP and HMTD. When the portable luminometer was used the LOD and LOQ were 50 and 100 ng mL−1, respectively, for both compounds. Introduction of light emission-enhancing compounds did not improve the analytical performance
of the assay. Imprecision (CV values) was always below 10%. Recovery varied rapidly with time, with an average value of 78%
after 5 min. No false-positive result was detected on measurement of a variety of samples; this is an important feature for
analysis on site. The method was applied both to contaminated materials and to fortified soil samples, simulating operational
conditions. |
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