A solid-phase microextraction method for the detection of ignitable liquids in fire debris.

A solid-phase microextraction method for the detection of ignitable liquids in fire debris.

Journal of forensic sciences (2008-05-13)

Hiroaki Yoshida, Tsuyoshi Kaneko, Shinichi Suzuki

ABSTRACT

A solid-phase microextraction (SPME) procedure involving direct contact between the SPME fibers and the solid matrix and subsequent gas chromatography/mass spectrometric analysis for the detection of accelerants in fire debris is described. The extraction performances of six fibers (100 mum polydimethylsiloxane, 65 mum polydimethylsiloxane-divinylbenzene, 85 mum polyacrylate, 85 mum carboxen-polydimethylsiloxane, 70 mum Carbowax-divinylbenzene, and 50/30 mum divinylbenzene-Carboxen-polydimethylsiloxane) were investigated by directly immersing the fibers into gasoline, kerosene, and diesel fuel. For simulated fire debris, in the direct contact extraction method, the SPME fiber was kept in contact with the fire debris matrix during extraction by penetrating plastic bags wrapping the sample. This method gave comparable results to the headspace SPME method in the extraction of gasoline and kerosene, and gave an improved recovery of low-volatile components in the extraction of diesel fuel from fire debris. The results demonstrate that this procedure is suitable as a simple and rapid screening method for detecting ignitable liquids in fire debris packed in plastic bags.

MATERIALS

Product Number

Brand

Product Description

28718-U

Supelco

Tenax^® TA / Carboxen^® 1018, glass TD tube, preconditioned, O.D. × L 1/4 in. × 3 1/2 in., Sealed with (Swagelok^® End-Fittings), pkg of 10 ea

29534-U

Supelco

Carboxen^® 569, glass TD tube, fritted, O.D. × L 1/4 in. × 3 1/2 in., preconditioned, pkg of 10 ea

20358

Supelco

ORBO^™ 90 Carboxen^® 564 (20/45), 160/80 mg, W,F,F separators, O.D. × L 6 mm × 75 mm, pkg of 25 ea, for analyte group MEK (methylethyl ketone)

20355

Supelco

ORBO^™ 78 HBr on Carboxen^® 564 specially cleaned (20/45), 400/200 mg, W,W,W separators, O.D. × L 6 mm × 110 mm, pkg of 25 ea

57318

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SPME Fiber Assembly, 75 μm CAR/PDMS, Fused Silica (1 cm), needle size 24 ga, Manual Holder, pk of 3, black hub

57334-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, StableFlex (1 cm), needle size 24 ga, Manual Holder, pk of 3, light blue hub

57343-U

Supelco

SPME Fiber Assembly, 75 μm CAR/PDMS, Fused Silica (1 cm), needle size 23 ga, Autosampler, pk of 3, black hub

57348-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (2cm), needle size 24 ga, Autosampler, pk of 3, notched gray hub

10478-U

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 1000, 60-80 mesh, bottle of 10 g

10263

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 563, 20-45 mesh, bottle of 10 g

25461

Supelco

Carboxen^®-1006 PLOT Capillary GC Column, L × I.D. 30 m × 0.53 mm, average thickness 30 μm

25467

Supelco

Carboxen^®-1010 PLOT Capillary GC Column, L × I.D. 30 m × 0.53 mm, average thickness 30 μm

10264

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 564, 20-45 mesh, bottle of 10 g

10269

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 569, 20-45 mesh, bottle of 10 g

57298-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (1 cm), needle size 23 ga, Autosampler, pk of 3, plain gray hub

57299-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (2cm), needle size 23 ga, Autosampler, pk of 3, notched gray hub

57295-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, StableFlex (1 cm), needle size 23 ga, Autosampler, pk of 3, light blue hub

57319

Supelco

SPME Fiber Assembly, 75 μm CAR/PDMS, Fused Silica (1 cm), needle size 24 ga, Autosampler, pk of 3, black hub

57344-U

Supelco

SPME Fiber Assembly, 75 μm CAR/PDMS, Fused Silica (1 cm), needle size 23 ga, Manual Holder, pk of 3, black hub

10477-U

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 1000, 40-60 mesh, bottle of 50 g

57335-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, StableFlex (1 cm), needle size 24 ga, Autosampler, pk of 3, light blue hub

57329-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (1 cm), needle size 24 ga, Autosampler, pk of 3, plain gray hub

57328-U

Supelco

SPME Fiber Assembly, 50/30µm DVB/CAR/PDMS, StableFlex (1cm), needle size 24 ga, Manual Holder, pk of 3, plain gray hub

24246

Supelco

Carboxen^®-1010 PLOT Capillary GC Column, L × I.D. 30 m × 0.32 mm, average thickness 15 μm

24241-U

Supelco

Carboxen^®-1006 PLOT Capillary GC Column, L × I.D. 30 m × 0.32 mm, average thickness 15 μm

11324-U

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 564, 20-45 mesh, pack of 144 × 290 mg

10471

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 1003, 40-60 mesh, bottle of 10 g

11072-U

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 572, 20-45 mesh, bottle of 10 g

57906-U

Supelco

SPME Fiber Assembly, 85 μm CAR/PDMS, Metal Alloy (1 cm), needle size 23 ga, Autosampler, pk of 1, light blue hub

11048-U

Supelco

Carboxen^® Adsorbent, matrix Carboxen^® 569, 20-45 mesh, bottle of 500 g