Wood preservatives containing a number of organochlorine insecticides, including aldrin, dieldrin, chlordane and lindane, have been approved in Australia for treating timber used as structural components in cargo containers. Studies on the migration of these insecticides from treated laminated timber and plywood, using commercial containers and in the laboratory, are reported here. The highest insecticide residue levels were found in flour samples stored on newly treated laminated sawn timber. Physical pick‐up of insecticide from the surface of the floor was considered to be the major source of contamination. Sorption of insecticides from the atmosphere of the container was the most likely source of contamination in samples stored on or near treated plywood.
A method is described for the estimation of residues of the carbamate insecticide promacyl [5‐methyl‐m‐cumenyl butyryl(methyl)carbamate] and its metabolites that are hydrolysable to isothymol (m‐cymen‐5‐ol), using high‐performance liquid chromatography with electrochemical detection to determine the isothymol. Clean‐up of samples relied on the steam volatility of phenols. Recoveries at the 0.1 mg kg−1 level varied from 72–88% for fat tissue and 81–91% for liver. The limits of detection were found to be 0.01 mg kg−1 for and 0.02 mg kg−1 for liver. A comparative study of the chromatography of sample extracts using both ultraviolet detection and electrochemical detection showed a substantial decrease in the level of interfering co‐eluates in the latter method. A field trial, involving a single spray application of the formulated acaricide on milking cattle, revealed residues in the butter fat comparable with those found in a previous investigation.
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