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By J. W. Hylin

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This instrumentation also pro- vides the presently very necessary detection in the microgram region. Some pesticides such as toxaphene present broad smears by 39 Bulletin of Experimental Contamination & Toxicology, Vol. 2, 1966, published by Springer-Verlag New York Inc. ordinary glc, but these smears can be compressed into usable peaks by using very short columns (3, 4) or -- in some instances and with the Dohrmann instrument -- by by-passing the use of a column entirely and using the injection block to release volatile components, the combustion unit to convert covalently bonded chlorine to chloride ion, and microcoulometry to measure the total chloride present regardless of the time required.

One-hundred g. of chopped bermudagrass were homogenized in 400 ml. of benzene, filtered through glass wool into a one liter separatory funnel and the filtrate extracted with 100 ml. of water. The benzene phase was separated from the water layer, dried with anhydrous sodium sulfate, filtered and a volume equivalent to five g. of plant material removed for further clean-up. This involved passing the benzene extract through a column containing five g. of a charcoal adsorbent mixture (1:1 Darco G-60 and Hyflo Super-eel) and eluting the Imidan with 70 ml.

W. DoROUGH, N. M. RANDOLPH and G. H. ), on grain sorghum and the fall armyworm, Spodo• ptera frusiperda (Smith), on Coastal bermudagrass. On grain sor- ghum, the residual persistance of dimethoate, ethion, azinphos• methyl and methyl parathion was determined while similar studies were performed with Imidan, N•(mercaptomethyl) phthaltmide-s-(o,cdimethylphosphorodithioate, and trichlorfon on Coastal bermudagrass. Treatment ~ Sorghum. The first applications were made when the sorghum grain was still in the dough stage.

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