Stability of explosive residues in methanol/water extracts, on alcohol wipes and on a glass surface  Nopporn Song-im, Sarah Benson, Chris Lennard  Forensic Science International  Volume 226, Issue 1, Pages 244-253 (March 2013) DOI: 10.1016/j.forsciint.2013.01.037 Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 Recovery of 15μg PETN spiked in an extract from a blank alcohol wipe and stored at room temperature (top), in the refrigerator (bottom left), and in the freezer (bottom right), measured over a period of 30 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Chromatograms of the extracts from alcohol wipes stored in the freezer and collected on the thirtieth day of the experiment: (a) extract spiked with 15μg PETN and prepared on the day of analysis (i.e., positive control); (b) negative control stored in the freezer over a period of 30 days; and (c) extract spiked with 15μg PETN and stored in the freezer over a period of 30 days. Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Recovery of 15μg PETN spiked on alcohol wipes and stored at room temperature (top), in the refrigerator (bottom left), and in the freezer (bottom right), measured over a period of 30 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Recovery of 15μg PETN deposited on glass slides inserted in a plastic slide mailer, packaged within a heat-sealed nylon bag, stored at room temperature and in the refrigerator, measured over a period of 30 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 5 Recovery of 15μg TNT spiked in extracts from blank alcohol wipes stored at room temperature (top), in the refrigerator (bottom left), and in the freezer (bottom right), measured over a period of 30 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 6 Recovery of 15μg TNT spiked on alcohol wipes stored at room temperature (top), in the refrigerator (bottom left), and in the freezer (bottom right), measured over a period of 30 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 7 Chromatograms of the samples extracted from alcohol wipes containing 15μg TNT (TNT solution deposited on the wipes) collected on the thirtieth day of the experiment: (a) stored in a clear vial at room temperature; (b) stored in an amber vial at room temperature; and (c) stored in the freezer. Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 8 Recovery of 15μg TNT deposited on glass slides inserted in a plastic slide mailer, packaged within a heat-sealed nylon bag, stored at room temperature and in the refrigerator, measured over a period of 30 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 9 Recovery of 30μg TATP spiked in extracts from blank alcohol wipes stored at room temperature (top), in the refrigerator (bottom left), and in the freezer (bottom right), measured over a period of 29 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 10 Recovery of 30μg TATP spiked on alcohol wipes stored at room temperature (top), in the refrigerator (bottom left), and in the freezer (bottom right), measured over a period of 29 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment (the dotted line in the graph for the refrigerator storage indicates where a change in temperature occurred during the course of the experiment). Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 11 Recovery of 30μg TATP deposited on glass slides inserted in plastic slide mailers, packaged within heat-sealed nylon bags, stored at room temperature and in the refrigerator, measured over a period of 13 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment. Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 12 Recovery of 30μg TATP deposited on glass slides inserted in plastic slide mailers, packaged within heat-sealed nylon bags, stored at various temperatures over a period of 5 days. The error bars represent the standard deviation (1 SD) of three replicate samples per experiment. Forensic Science International 2013 226, 244-253DOI: (10.1016/j.forsciint.2013.01.037) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions