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By J. W. Hylin

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Extra info for Bulletin of Environmental Contamination and Toxicology

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Ethion was determined spectrophotometrically as a copper salt complex of its hydrolysis product, diethyl phosphorodithioic acid (2). Techniques for clean-up and detection of azinphosmethyl were taken from Adams (3) and Anderson (4) which involved alkaline hydrolysis to anthranilic acid, diazotization and coupling with N-(1-naphthyl) ethylenediamine to produce color. Methyl parathion residues were detected using the colorimetric method of Averell and Norris (5). Coastal Bermudagrass. Trichlorfon residues were determined with a Barber-Colman Series 5000 Gas Chromatograph equipped with a sodium thermionic detector (6).

C. /min. was maintained through Further aliquots were put through an Aerograph Autoprep 705 glc unit with electron-capture detector. /min. ~~~~~~~ -- Aliquots were concentrated to near dryness and spotted on fluorescent silica gel thin-layer plates. f values were determined. Appropriate areas were scraped off, the compounds were extracted, and the resulting solutions were gas chromatographed. 3~1. cavity cells of 5~. light path. Ultraviolet spectra were recorded on a Beckman DK-2 instrument and silica cells of 1-cm.

D. D. Swagelok, one ana 1/4 11 NPT (Swagelok #400-8-4·316); and!!. D. stainless steel tubing. Assembly: Remove the column entrance and exit connectors from the block of a Dohrmann Microcoulometric Gas Chromatograph. Drill 7/16" hole .! 3/4" deep in the face of the block halfway be. tween the connector ports, then tap it for 1/4" NPT. Drill 3/16" hole b as shown in Fig. 1, about 3/4" from the face of the block so that it interconnects hole .! and the bottom reduced portion of the column entrance port; then weld of the block.

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