Journal of Chromatography & Separation Techniques
Open Access

Gas chromatographic determination of marking substances added to industrial plastic explosives

2^nd International Conference and Expo on Separation Techniques

September 26-28, 2016 Valencia, Spain

V M Gruznov and M N Baldin

Trofimuk Institute of Petroleum Geology and Geophysics SB-RAS, Russia

Posters & Accepted Abstracts: J Chromatogr Sep Tech

Abstract :

Conditions of trace detection of marking substances (MS)-4-nitrotoluene (NT) and 2,3-dimethyl-2,3-dinitrobutane (DMNB) added to plastic explosives with gas chromatography using air as a carrier-gas and sample concentration allowing one to achieve low limits of MS vapor detection are determined. A strong dependence of the amplitude of the chromatographic peak of the MS on humidity of air used as a carrier-gas is revealed. It is advisable to use air which is highly dehydrated to an absolute humidity 8.5 mg/m3 corresponding to a dew point of -62�?°Ð¡. We used metal grids from stainless steel wire 0.05 mm in diameter with a mesh size of 0.08x0.08 mm2 to concentrate MS vapors. The grid diameter is 7.5 mm. We used concentrators of the following arrangements: Grids coated with silicone liquid stationary phase (SLP), Tenax and glass wool placed between the grids. It is found that for each concentrator there is a range of linearity between the peak amplitude and sample volume passed through a concentrator. Concentrators with LSP and grids+Tenax are the most efficient for a sample volume of 200 ml (sampling time, 25 s).

Biography :

Email: Gruznovvm@ipgg.sbras.ru