Determination of soil fumigants in air using tandem capillary gas chromatography after charcoal trapping

Abstract

is acknowledged for supplying the plasma samples tested. References[l] B. Hedback and L. S. Hermann, Acta Med. Scand. suppl. 681 (1984) 129-134. [2] M. Schomerus, B. Spiegelhalder, B. Stieren, and M. Eichelbaum, Cardiovasc. Res. 10 (1976) 605-61 2. G. Neugebauer, Cardiovasc. Res. 12 (1978) 247-254 G. M. Thomson and L. K. Pannell, J. Anal. Toxicol. 5 (1981) [3] [4] 105-1 09. [5] S. R. Harapat and R. . 70 (1981) V. K. Piotrovskii, D. 0. Ruminatsev, and V. 1. Metelitsa, J. Chromatogr. 275 (1983) 95-200. P. A. Kapur, T. L. Aw, and E. Watson, J. Chrornatogr. 337 222 (1981) 507-51 1. 800-80 1 .(1 985) 160-1 65. SummarySoil fumigants, like 1,3-dichIoropropene and metham-sodium (forming methyl isothiocyanate) diffuse into the atmosphere, thus presenting a hazard to people in the surroundings. A method is described in which a large volume (50 PI) of extractant, used to desorb the compounds from charcoal, is injected into a GC, equipped with two capillary columns. By way of Deans switching, the solvent is separated from the compounds of interest. Modification of a GC sampler makes unattended analyses possible.

Low cost, robust, in‐house hardware for heart cutting two‐dimensional gas chromatography

“…Berg and Jonsson's [34], Hagman and Jacobsson's [35,36] and Chrompack's MUSIC [37][38][39] vented Deans switches operated on the same principles as the design presented here, although they all used metal compression fittings in flow lines, and Hagman and Jacobsson used needle valves as restrictors on both the vent and the transfer line to the first dimension detector. The present design takes advantage of the development of press-tight connectors [40] to build inert, low volume, zero dead volume sample flow paths.…”

“…Vented Deans switches were introduced in the mid-1980s [34][35][36], and a vented switch with a cold trap was at one time available from Chrompack as part of their , MUSIC' system [37][38][39], but an exhaustive search of the World Wide Web and the scientific literature yielded found no currently available equivalent.…”

Determination of Methyl Isothiocyanate in Air Downwind of Fields Treated with Metam-Sodium by Subsurface Drip Irrigation

“…A widely used method for trapping MITC from air is to perform cumulative sampling through charcoal tubes, followed by solvent elution and gas chromatographic determination using flame ionization or nitrogen−phosphorus detectors ,– . An alternative analytical method involves benzyl alcohol elution of charcoal in a sealed vial to release the MITC, followed by headspace gas chromatography .…”