Abstract
The analysis of inorganic anions found in residues of low explosives present a difficult forensic problem. Current methods are neither quantitative nor sensitive. While the liquid chromatographic separation of these anions is relatively easy, their detection is difficult since they cannot be detected by conventional high-performance liquid chromatography detectors. We report a method that a can detect inorganic anions, which are commonly found in combustion residues of low explosives, by reversed-phase ion-pair liquid chromatography, using indirect UV detection. The ion-pair reagent is benzyltributylammonium chloride. In addition, the phosphate buffer mobile phase contains hexane sulfonate. There is little sample preparation since no interferences were encountered while testing real samples from explosive residues. Detection limits are low and selectivity is high compared with existing techniques. Analysis time is short and the separation can be repeated immediately.
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