A micro-volume electron capture detector for use in high resolution capillary column gas chromatography

1983 ◽  
Vol 6 (12) ◽  
pp. 651-654 ◽  
Author(s):  
G. Wells
Keyword(s):  
Gas Chromatography ◽  
High Resolution ◽  
Electron Capture ◽  
Capillary Column ◽  
Electron Capture Detector ◽  
Capillary Column Gas Chromatography

ANALYSIS OF C4 EXPLOSIVE RESIDUES ON POST BLAST HAIR SAMPLES

2012 ◽  
Vol 57 (1) ◽  
Author(s):  
UMI KALTHOM AHMAD ◽  
NOOR HIDAYAT ABU BAKAR ◽  
SHAIKH ABDUL ADZIZ SHAIKH ABDULLAH
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Capillary Column ◽  
Human Head ◽  
Electron Capture Detector ◽  
Pentaerythritol Tetranitrate ◽  
High Explosives ◽  
Hair Samples

The occurrence of crimes involving high explosives in Malaysia in recent years has warrant the need for the analysis of high explosives in post blast samples, particularly residues that could be found on hairs of victims. This study reports on the detection of post blast residues of C4 explosives on human head hairs. Prior to a simulated explosion, a bundle of hair (200 strands) was tightly bound to a metal hook at each point of several pre–determined distances from the bomb seat. Hair samples containing post blast residues were extracted by ultrasonication using acetonitrile. Two analytes of interest, cyclotrimethylenetrinitramine (RDX) and pentaerythritol tetranitrate (PETN) were successfully separated using gas chromatography with electron capture detector (GC–ECD) on an HP5–MS capillary column. It was found that the amount of explosive residues decreased with increasing distance from the point of blast. At the nearest specified distance of 2.5m, the amount of PETN residues deposited on hair was much less compared to that of RDX residues.

Gas Chromatographic Determination of Captan, Folpet, and Captafol Residues in Tomatoes, Cucumbers, and Apples Using a Wide-Bore Capillary Column: Interlaboratory Study

1991 ◽  
Vol 74 (5) ◽  
pp. 830-835 ◽  
Author(s):  
Dalia M Gilvydis ◽  
Stephen M Walters
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Capillary Column ◽  
Chromatographic Determination ◽  
Interlaboratory Study ◽  
Electron Capture Detection ◽  
Coefficients Of Variation ◽  
Capillary Column Gas Chromatography ◽  
Ppm Level

Abstract An interlaboratory study of the determination of captan, folpet, and captafol in tomatoes, cucumbers, and apples was conducted by 4 laboratories using wide-bore capillary column gas chromatography with electron capture detection. The 3 fungicides were determined using the Luke et al. multlresidue method modified to Include additional solvent elutlon in the optional Florisll column cleanup step used with this method. The crops were fortified with each fungicide at 3 levels per crop. Mean recoveries ranged from 86.2% for a 25.1 ppm level of captan in apples to 115.4% for a 0.288 ppm level of captafol In apples. Interlaboratory coefficients of variation ranged from 3.4% (24.7 ppm folpet) to 9.7% (0.243 ppm captafol) for tomatoes; from 2.8% (2.0 ppm captafol) to 8.2% (24.8 ppm captan) for cucumbers; and from 1.5% (0.234 ppm folpet) to 22.1% (0.266 ppm captafol) for apples.

Capillary Column Gas Chromatographic Determination of Dicamba in Water, Including Mass Spectrometric Confirmation

1989 ◽  
Vol 72 (5) ◽  
pp. 840-844
Author(s):  
Nancy C Jimenez ◽  
Yousef H Atallah ◽  
Thomas R Bade
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Ethyl Ether ◽  
Capillary Column ◽  
Chromatographic Determination ◽  
Mass Spectrometric ◽  
Gas Chromatography Mass Spectrometry ◽  
Electron Capture Detection ◽  
Selected Ion Monitoring ◽  
Capillary Column Gas Chromatography

Abstract A sensitive method is described for determining dicamba at low μg/L levels in ground waters by capillary column gas chromatography with electron-capture detection (GC-EC); compound identity is confirmed by gas chromatography-mass spectrometry (GC-MS) using selected ion monitoring. Dicamba residue is hydrolyzed in KOH to form the potassium salt. The sample is then extracted with ethyl ether which is discarded. The aqueous phase is acidified to pH < 1 and extracted twice with ethyl ether. The combined ethyl ether extracts are concentrated, and the residue is methylated using diazomethane to form the corresponding dicamba ester. The derivatized sample is cleaned up on a deactivated silica gel column. The methylated dicamba is separated on an SE-30 capillary column and quantitated by electron-capture or mass spectrometric detection. Average recoveries (X ± SD) for ground water samples fortified with 0.40 μg/L of dicamba are 86 ±5% by GC-EC and 97 ± 7% by GC-MS detections. The EDL (estimated detection limit) for this method is 0.1 μg dicamba/L water (ppb).

Sign in / Sign up

Export Citation Format

Share Document