Pre-Screening for Explosives Residues
11
observed when analyzing samples from anti-tank firing points where high
concentrations of propellant are present. It is hypothesized that these samples
contained high concentrations of nitrocellulose, which is not detectable with the
methods used for HPLC or GC analysis. These samples did contain concentra-
tions of NG and 2,4 DNT, but less than the level of concentration suggested by
the Expray indication, thus causing redilution and reanalyzing of the samples.
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